Honda Accord: Brake Booster Test
Functional Test
1. With the ignition switch in LOCK (0), press the brake pedal several times to deplete the vacuum reservoir, then press the brake pedal hard and hold it for 15 seconds. If the brake pedal sinks, either the master cylinder is bypassing internally or the brake system is leaking. Inspect the brake hoses and lines (see page 19-39).
2. Start the engine with the brake pedal pressed. If the brake pedal sinks slightly, the vacuum booster is operating normally. If the brake pedal height does not vary, do the brake system test (see page 19-4).
Leak Test
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.
- If it rises, the booster is OK.
- If it does not rise, 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.
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 the check valve, and retest.
- If vacuum is found, go to step 5.
5. With the ignition switch in 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 the booster. If the seal is OK, replace the brake booster.
В« If the pedal position varies, replace the brake booster vacuum hose/check valve as an assembly.
Master Cylinder Inspection
1. Remove the master cylinder (see page 19-26).
2. Inspect and note these items:
- Before reassembling, check that all parts are free of
dirt and other foreign particles.
- Do not try to disas ...
Brake Booster Replacement
1. Remove the cowl cover (see page 20-278).
2. Remove the strut brace (if equipped) (see page
20-306).
3. Remove the master cylinder (see page 19-26).
4. Disconnect the brake booster vacuum ...
See also:
Parking Brake Switch Test
NOTE: if both the ABS/VSA indicator and the brake
system indicator come on at the same time, check the
VSA system for DTCs first (see page 19-48).
1. Remove the center console (see page 20-158).
...
Outside Air Temperature Sensor Test
NOTE: Before testing the sensor, check for HVAC DTCs
(see page 21-101):.
1. Remove the outside air temperature sensor (seepage'
21-185).
2. Dip the sensor in ice water, and measure the
resist ...
Body Specifications
4-door Model:
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