2512076 Bendix Hydrovac Brake Booster for International Trucks

The Bendix Hydrovac brake booster, part number 2512076, is an important brake booster used on International trucks, including applications such as the International Loadstar 1600, as well as select GMC medium-duty truck applications. This single-diaphragm vacuum booster helps increase brake pedal force for safer, more effective stopping power in heavy-duty vehicles.

Part Overview and Function

The 2512076 Hydrovac is a frame-mounted brake booster with a 12-3/4 inch diameter and 17-5/8 inch length. It includes a 1/2 inch grommet-style input, 1/2-20 copper gasket output, 3/4 inch air cleaner, and 1/2 inch NPT vacuum supply port.

Engineered for durability, this Bendix component is well suited for International medium-duty trucks and helps provide consistent braking performance under demanding conditions. Its design makes it a common choice for fleet managers, repair shops, and owner-operators who need dependable brake assist.

Purchasing from Ace Motor Parts

At Ace Motor Parts, we specialize in brand-new Bendix 2512076 Hydrovac brake boosters that are custom-built to order for your International truck. These units eliminate the need for a core return, saving you the cost and inconvenience of shipping back an old core.

These new Hydrovac units are built with care and typically ship within 3–5 business days. Before ordering, we recommend contacting us to verify fitment and confirm that this is the correct Hydrovac booster for your vehicle.

Cross-Reference Numbers

To source the correct Hydrovac, cross-referencing part numbers is important. The Bendix 2512076 may interchange with the following numbers:

• 2512076
• RV2512076X
• 2514917
• 1669493C91
• 2512076X
• 51-8002

These numbers may appear on the booster tag, sometimes stamped as 18 2512076, or listed in service manuals. Because fitting locations and minor design details can vary, always confirm compatibility before purchasing.

Testing the Hydrovac for Performance

To help determine whether your 2512076 Hydrovac is operating correctly, use the following basic diagnostic steps:

1. Visual Inspection

Inspect the booster, vacuum lines, and fittings for wear, leaks, cracks, corrosion, or loose connections. Make sure the vacuum hose is secure and in good condition.

2. Vacuum Check

With the engine running, connect a vacuum gauge to the 1/2 inch NPT port. A reading of approximately 15–20 inHg generally indicates proper vacuum supply. Lower readings may point to a vacuum leak, engine vacuum issue, or internal booster problem.

3. Pedal Test

With the engine off, pump the brake pedal several times to exhaust the stored vacuum. The pedal should become firm. Then start the engine while holding light pressure on the pedal. If the pedal drops slightly, the booster is providing vacuum assist. If there is no change, the booster or vacuum supply should be inspected further.

4. Driving Test

During a careful test drive in a safe area, the brakes should respond smoothly without excessive pedal effort. Weak, delayed, or inconsistent braking may indicate a booster or hydraulic brake system issue.

Maintenance Notes

Regular maintenance, including inspection of vacuum lines, fittings, and the air cleaner, can help extend the life of the Hydrovac. If brake assist problems continue after checking the vacuum supply and hydraulic system, replacement may be needed.