Air Brake Compressors

An air brake compressor is the heart of a heavy-duty truck's compressed-air system. Driven by the engine, it supplies the air pressure used by the service brakes, parking brakes and, on many vehicles, auxiliary equipment such as air suspension, transmission controls and cab accessories. When the compressor can no longer build and maintain pressure correctly, the entire air system is affected.

Ace Motor Parts supplies replacement air brake compressors for heavy-duty trucks, buses, vocational vehicles and selected industrial equipment. The listings below include Bendix, Haldex, Wabco and Cummins compressor part numbers found in our current product catalog. Each linked part number opens its individual product page in a new browser tab, allowing you to keep this reference page open while comparing specifications and cross-reference numbers.

The compressor family shown in the tables—such as TF-500, TF-501, TF-550, TF-700, TF-750, BA-921, BX-2150, EL-1300 or EL-1600—was identified from the product title and Shopify handle in the uploaded catalog export. Where the export includes general truck-manufacturer information, that information is shown in the application column. Because a manufacturer name alone does not establish exact fitment, the original compressor number, engine application, mounting pattern, drive arrangement, cylinder-head configuration and air connections should always be confirmed before ordering.

How an Air Brake Compressor Works

Most heavy-duty air brake compressors are engine-driven reciprocating pumps. As the compressor piston moves downward, filtered air enters the cylinder through the inlet valve. The upward stroke compresses that air and sends it through the discharge line toward the air dryer and reservoirs. A governor monitors system pressure and controls when the compressor loads and unloads.

During the loaded cycle, the compressor builds reservoir pressure. Once the system reaches the governor's cut-out setting, the unloading mechanism prevents the compressor from continuing to pump against a fully charged system. When pressure falls to the governor's cut-in setting, the compressor returns to its loaded cycle. Proper operation therefore depends not only on the compressor, but also on the governor, air dryer, discharge line, intake system, cooling system and the absence of major downstream air leaks.

Do you have a part number on the tag of your compressor but still cannot identify it or find it online? Use our Bendix Air Compressor Cross Reference to search for matching Bendix compressor numbers and replacement information.

Identifying the Correct Replacement Compressor

Two compressors from the same basic family can have different crankshafts, mounting flanges, drive gears, cylinder heads, water connections, oil connections or inlet and discharge-port locations. For that reason, selecting a replacement by appearance alone can lead to an incorrect order.

Begin with the OEM or remanufactured part number on the existing compressor. Also record the truck manufacturer, model, year, engine model and engine serial number. Photographs of the complete compressor are helpful, particularly clear views of the mounting flange, drive end, cylinder head, coolant fittings and air connections.

Ace Motor Parts would be happy to help you identify the correct compressor by part number for your application. Please feel free to call is or contact us on our Parts Inquiry page.

Air Brake Compressor Part Numbers

Use the tables below as a starting point. The application information reflects general manufacturer references contained in the uploaded Shopify product export and should not be treated as a complete vehicle-fitment guarantee. Click a part number to review its product page and available cross-reference information.

Bendix Air Brake Compressors

Bendix compressor families represented in this catalog include the TF-400, TF-500, TF-501, TF-550, TF-600, TF-700, TF-750, TF-1000, BA-921, BX-2150 and 12000 Series. Differences within a family may include the drive, crankshaft, mounting flange, head and port arrangement.

Part Number Compressor Model Application Information in Product Export
278604X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289251X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286017X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
109079X BX-2150 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286537X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286585X TF-501 Confirm by OEM number, engine and mounting configuration
5007465X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
228228X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5005272X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289789X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
101256X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286582X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
107510X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
288982X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
OR5002984X
Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
109647X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286530X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
282749X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
284024X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
283429X TF-400 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286574X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286541X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5003728X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5011016X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286620X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5002868X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286549X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
279839X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5001912X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
288942X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289342X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5019322X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
275231X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5011427X BA-921 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
284662X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286616X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5015615X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289790X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286617X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
109659X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286548X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286554X TF-501 Confirm by OEM number, engine and mounting configuration
5002984X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
108557X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289290X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
OR107511X Model not stated in export Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289388X TF-400 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5016614X BA-921 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5003254X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5010824X BA-921 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
282023X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
277731X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
227328X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KZ1087-4X
Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286623X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289444X TF-400 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286550X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5002983X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289534X TF-400 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
283644X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286529X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
229839X TF-1000 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5005790X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN12041X-12000 12000 Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5009770X TF-750 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
286556X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5019445X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
289282X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
285987X TF-501 Confirm by OEM number, engine and mounting configuration
227440X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5012664X TF-750 Confirm by OEM number, engine and mounting configuration
289281X TF-700 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5019155X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
280628X TF-600 Confirm by OEM number, engine and mounting configuration
287631X TF-501 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
283585X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
283530X TF-400 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
285252X TF-500 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
5018275X TF-550 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*

Haldex Air Brake Compressors

The Haldex listings include 740 Series, EL-850, EL-1300 and EL-1600 compressors, along with one listing whose family is not stated in the export title. Confirm the complete part number and physical configuration before ordering.

Part Number Compressor Model Application Information in Product Export
EL16090X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13220X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL365132X
Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL16100X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN7010X 740 Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13160X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13070X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN7170X 740 Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13060X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN7060X 740 Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL16111X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN85020X EL-850 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13112X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
KN85021X EL-850 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL16053X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13151X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13312X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13021X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL16200X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13111X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL13100X EL-1300 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
EL16160X EL-1600 Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*

Wabco Air Brake Compressors

The Wabco products in the export are identified primarily by their complete OEM-style part numbers. The export titles do not consistently state a separate compressor family, so these entries are labeled Wabco OEM Series rather than assigning an unsupported model designation.

Part Number Compressor Model Application Information in Product Export
9111530200X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111545000X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9115169220X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111530557X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9125120290X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9122180027X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111535400X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111535330X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111540010X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9115150200X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111530210X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111530190X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111539397X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
4123520270X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111535100X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111539450X Wabco OEM Series Confirm by OEM number, engine and mounting configuration
9123520337X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111535200X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111545130X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9111460030X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
9122100000X Wabco OEM Series Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*

Cummins Air Brake Compressors

The Cummins products in the export are engine-mounted compressor assemblies identified primarily by their complete part numbers. Exact fitment depends heavily on the Cummins engine family, engine serial number, drive arrangement and compressor configuration.

Part Number Compressor Model Application Information in Product Export
3558060X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3018543X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558140X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558211X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558204X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558208X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558188X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558212X Cummins Engine-Mounted Confirm by OEM number, engine and mounting configuration
3558051X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558043X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558215X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558206X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558147X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558189X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558122X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558094X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558044X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558107X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558098X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558000X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558005X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3558122SX Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*
3045615X Cummins Engine-Mounted Freightliner, Ford, GM, Kenworth, Navistar, Peterbilt applications*

*Application note: Manufacturer names shown in the tables were taken from the application statements in the uploaded product export. They indicate broad catalog associations only. They do not mean that every listed compressor fits every truck produced by those manufacturers.

Common Air Brake Compressor Problems

A compressor is sometimes blamed for an air-system problem that actually begins elsewhere. Before replacing the unit, inspect the complete system and compare the symptoms with the truck manufacturer's service information.

Slow Air-Pressure Build-Up

A truck that takes too long to build air pressure may have worn compressor cylinders or piston rings, damaged inlet or discharge valves, a restricted intake, a leaking head gasket or an unloading mechanism that is not returning fully to the loaded position. However, substantial leaks in brake chambers, reservoir fittings, air lines, suspension components or accessories can create the same symptom. A restricted or carbon-filled discharge line can also reduce output and cause excessive compressor temperature.

Compressor Runs or Pumps Continuously

If the compressor appears to remain loaded after normal cut-out pressure is reached, check the governor, governor signal line and unloader mechanism. A large downstream air leak may prevent the system from reaching cut-out pressure at all. The air dryer purge valve and associated control lines should also be inspected before the compressor is condemned.

Excessive Oil in the Air System

Oil found in the reservoirs or air dryer may indicate worn compressor rings, cylinder wear, excessive crankcase pressure, a restricted intake or an incorrect oil-drain arrangement. A small amount of oil residue does not necessarily establish compressor failure. The amount collected, mileage, duty cycle and condition of the air dryer should all be considered. Replacing the compressor without correcting a restricted intake or excessive engine crankcase pressure can allow the problem to return.

Compressor Overheating

Overheating may result from restricted coolant flow on water-cooled units, low coolant, blocked passages, a carbon-restricted discharge line, excessive duty cycle or high discharge pressure. Inspect the coolant hoses and fittings, verify that the discharge line is the correct size and length, and check whether system leaks are forcing the compressor to remain loaded for long periods.

Unusual Noise, Knocking or Vibration

Mechanical noise can come from worn compressor bearings, piston or connecting-rod damage, a loose drive gear, damaged accessory-drive components or an incorrect mounting condition. Because an engine-drive failure can cause extensive damage, a compressor that develops sudden knocking, grinding or severe vibration should be inspected promptly.

Excessive Moisture in the Reservoirs

All compressors introduce some moisture into the air system. Excessive water accumulation is often related to the air dryer, purge cycle, desiccant condition, duty cycle or reservoir-draining practices rather than an internal compressor defect. Inspect the air dryer and verify that it purges properly before replacing the compressor solely because water is present.

Checks to Make Before Replacing the Compressor

  • Measure reservoir build time according to the vehicle manufacturer's procedure.
  • Inspect the complete air system for leaks, including the air dryer and auxiliary circuits.
  • Verify governor cut-in and cut-out operation.
  • Inspect the intake hose and filter for restriction or collapse.
  • Check the discharge line for carbon buildup, damage, kinks or improper routing.
  • Confirm adequate coolant flow on water-cooled compressors.
  • Inspect oil-feed and drain passages where applicable.
  • Check the compressor mounting, drive gear and accessory drive for looseness or damage.
  • Confirm that excessive engine crankcase pressure is not contributing to oil carry-over.

When a compressor has suffered a major mechanical failure or produced heavy carbon and oil contamination, the discharge line, air dryer and reservoirs should be inspected and serviced as necessary. Installing a replacement compressor into a restricted or contaminated system can damage the new unit or reproduce the original symptoms.

Frequently Asked Questions About Air Brake Compressors

What information is needed to identify a compressor?

The most useful information includes the complete part number on the existing compressor, truck year and model, engine model, engine serial number and clear photographs. The mounting flange, drive end, cylinder head and port arrangement are especially important when the original tag is missing or difficult to read.

Can two compressors from the same model family interchange?

Not automatically. Two TF-500, TF-501, TF-550 or BA-921 compressors may differ in ways that prevent direct interchange. The complete part number and physical configuration should be compared rather than relying only on the family name.

Does slow air build always mean the compressor is worn out?

No. Air leaks, a defective governor, a malfunctioning unloader, a restricted intake or discharge line, and problems within the air dryer can all cause slow pressure build-up. Testing the entire system before replacement helps prevent unnecessary compressor work.

Where can I browse the complete compressor collection?

Browse the complete Ace Motor Parts selection of air brake compressors for heavy-duty trucks.

Important identification and service note: Product-family and application information on this page is provided as a general reference. Vehicle and engine configurations, production changes and previous repairs may affect fitment. Confirm the complete part number, engine application, mounting arrangement, drive configuration and connections before ordering. Air-brake diagnosis and repair should be performed using the appropriate vehicle and component service procedures.