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:
Ambient Light Replacement
With moonroof
NOTE: The ambient light is built into the moonroof
switch.
1. Remove the front individual map lights (see page
22-258).
2. Disconnect the moonroof switch 12P connector (A)
and ...
General Troubleshooting
Information
Mow to Check for DTCs with the HDS
NOTE: Check the vehicle battery condition first {see page 22-90).
1. Make sure the ignition switch is turned to LOCK (0).
2. Connect the HDS to the data link ...
Troubleshooting
Special Tools Required
Vacuum Pump/Gauge, 0-”30 inHg Snap-on YA4000A or
equivalent commercially available
NOTE:
- Check the vacuum hoses and the lines for damage and
proper connections befor ...