LEMON Manuals: Even more car manuals for everyone
Home >> Honda >> 2015 >> Pilot EX, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Conventional Brake System) >> Brake Booster Test >> Leak Test

Leak Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2014 Honda Ridgeline, 2013 Honda Ridgeline, 2012 Honda Ridgeline, 2011 Honda Ridgeline, and 2010 Honda Ridgeline. However, it is still accessible from the selected car via links, so may be relevant.
  1. Press the brake pedal with the engine running, then turn the ignition switch to LOCK (0). The brake pedal height should not vary while pressed for 30 seconds.
    • If the pedal height rises go to step  6.
    • If it does not rise go to step 2.
  2. Start the engine and let it idle for 30 seconds. Turn the ignition switch to LOCK (0), and wait 30 seconds. Press the brake pedal several times using normal pressure. When the pedal is first pressed, it should be low. On consecutive applications, the pedal height should gradually rise. Does the pedal rise on each consecutive application?
    • If it rises the booster is OK.
    • If it does not go to step 3.
  3. Disconnect the brake booster vacuum hose (A) at the booster. The check valve (B) is built into the hose.
    NOTE:

    If the check valve is faulty, replace the brake booster vacuum hose/check valve as an assembly.

    Fig 1: Identifying Brake Booster Vacuum Hose And Valve
    G05965381Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Start the engine, and let it idle. There should be vacuum available.
    • If no vacuum is available, the check valve is not working properly. Replace the brake booster vacuum hose and check valve, and retest.
    • If vacuum is found, go to step 5.
  5. With the ignition switch at LOCK (0), reconnect the vacuum hose to the brake booster.
  6. Start the engine, and then pinch the brake booster vacuum hose between the check valve and the booster.
  7. Turn the ignition switch to LOCK (0), and wait 30 seconds. Press the brake pedal several times using normal pressure. When the pedal is first pressed, it should be low. On consecutive applications, the pedal height should gradually rise.
    • If the pedal position does not vary inspect the seal between the master cylinder and booster. If the seal is OK, replace the brake booster.
    • If the pedal position varies, replace the brake booster vacuum hose/check valve assembly.
scientia non olet · About LEMON Manuals