| Brake Diagnostic Tips | |
Symptom: Excessive Travel of Brake Pedal |
|
| Problem | Possible Cure |
| Insufficient brake fluid in reservoir | Top up |
| Air in hydraulic system | Bleed brakes |
| Brakes out of adjustment | Adjust |
| Excessive lining wear | Adjust or refit new |
| Leaks at pipe unions | Locate and rectify |
| Leakage past seals in master cylinder, caliper or wheel cylinders | Rebuild all cylinders with new seals |
| Worn clevis pin on pedal linkage | Fit new pin |
| Pedal free incorrect | Adjust |
Symptom: Grabbing Brakes |
|
| Problem | Possible Cure |
| Air | Bleed brakes |
| Warped drums or discs | Have machined or replaces |
| Tire pressure | Correct |
| Mismatched tires | Correct |
| Loose caliper or back plate | Tighten |
| Rear spring, axle or U-bolts loose | Tighten |
| Contaminated linings | Refit new and find source of leak |
| Loose wheel bearings | Adjust or fit new |
| Sticking wheel cylinder piston | Overhaul all wheel cylinders |
| Wheel cylinder leaking | Overhaul complete system |
| Clogged brake pipe | Flush system |
| Flattened brake pipe | Replace |
Symptom: Spongy Pedal Problem |
|
| Problem | Possible Cure |
| Low fluid in reservoir | Top up-check for leak |
| Seals in master cylinder worn | Rebuild master cylinder |
| Defective flexible hoses | Renew hoses |
| Air | Bleed |
| Wheel cylinder leaking | Overhaul complete system |
| Brake pedal slowly sinks to floor with steady pressure | Usually master cylinder needs overhaul |
Symptom: Hard Pedal |
|
| Problem | Possible Cure |
| Seized piston | Overhaul hydraulic system |
| Oil or brake fluid on linings | Replace lining, determine cause of leak |
| Binding pedal | Seized caliper, a wheel cylinder piston or fulcrum pin |
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