Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: Brake pedal effort is too high when stopping | ||||
1 | Check for broken or damaged hydraulic pipes or hoses. Are the brake pipes and hoses OK? | -- | Go to Step 2 | Go to Brake Pipe Replacement |
2 | Check for a damaged, collapsed, loose, or open vacuum hose. Are the vacuum hoses OK? | -- | Go to Step 3 | |
3 | Look for a faulty vacuum check valve or a leaking grommet. Are the check valve and the grommet OK? | -- | Go to Step 4 | |
4 | Check for a loose or plugged vacuum fitting. Are the vacuum fittings OK? | -- | Go to Step 5 | |
5 | Check for a faulty air valve seat or a faulty support plate. Refer to Power Vacuum Brake Booster Replacement . Are the air valve seal and the support plate OK? | -- | Go to Step 6 | |
6 | Check for a damaged floating control valve. Refer to Power Vacuum Brake Booster Replacement . Is the floating control valve OK? | -- | Go to Step 7 | |
7 | Check for bad stud welds on the front or the rear housing or on the power head. Refer to Power Vacuum Brake Booster Replacement . Are the stud welds OK? | -- | Go to Step 8 | |
8 | Check for a faulty booster diaphragm. Refer to Power Vacuum Brake Booster Replacement . Is the diaphragm OK? | -- | Go to Step 9 | |
9 | Check for a worn or distorted reaction plate or levers. Refer to Power Vacuum Brake Booster Replacement . Are the reaction plate and the levers OK? | -- | Go to Step 10 | |
10 | Check for a broken power piston or retainer. Refer to Power Vacuum Brake Booster Replacement . Are the power piston and the retainer OK? | -- | Go to Step 11 | |
11 | Verify your repair. Is the system performing correctly? | -- | System OK | Begin the diagnosis again. Go to Step 1 |
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
DEFINITION: The brakes grab on and off. | ||||||||||||||
1 |
Refer to Brake Pipe Replacement . Did you find and correct a problem? | -- | Go to Step 8 | Go to Step 2 | ||||||||||
2 | Check the fluid level in the master cylinder. Is the fluid level low in the master cylinder? | -- | Go to Step 3 | Go to Step 4 | ||||||||||
3 |
Did you find and correct a problem? | -- | Go to Step 8 | Go to Step 4 | ||||||||||
4 | Inspect the master cylinder seals. Refer to Master Cylinder Diagnosis . Did you find and correct a problem? | -- | Go to Step 8 | Go to Step 5 | ||||||||||
5 | Check the master cylinder casing. Refer to Master Cylinder Diagnosis . Did you find and correct a problem? | -- | Go to Step 8 | Go to Step 6 | ||||||||||
6 | Look for leaks in the following components:
Did you find and correct a problem? | -- | Go to Step 8 | Go to Step 7 | ||||||||||
7 | Check for air in the hydraulic system. Refer to Hydraulic Brake System Bleeding . Did you find and correct a problem? | -- | Go to Step 8 | -- | ||||||||||
8 | Verify your repair. Is the system performing correctly? | -- | System OK | Begin the diagnosis again. Go to Step 1 | ||||||||||
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The brakes drag or do not release at one wheel or at all wheels . | ||||
1 | Check for a blocked power piston passage. Refer to Power Vacuum Brake Booster Replacement . Did you find and correct a problem? | -- | Go to Step 7 | Go to Step 2 |
2 | Inspect the air valve. Refer to Power Vacuum Brake Booster Replacement . Did you find and correct a problem? | -- | Go to Step 7 | Go to Step 3 |
3 |
Refer to Power Vacuum Brake Booster Replacement . Did you find and correct a problem? | -- | Go to Step 7 | Go to Step 4 |
4 | Check the brake pedal linkage for binding. Refer to Brake Pedal Travel . Did you find and correct a problem? | -- | Go to Step 7 | Go to Step 5 |
5 | Inspect the stoplamp switch adjustment. Refer to Stop Lamp Switch Replacement . Did you find and correct a problem? | -- | Go to Step 7 | Go to Step 6 |
6 | Check the cruise control release switch adjustment. Refer to System Check in Cruise Control. Did you find and correct a problem? | -- | Go to Step 7 | -- |
7 | Verify your repair. Is the system performing correctly? | -- | System OK | Begin the diagnosis again. Go to Step 1 |
