| 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 replaced |
| 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 |
Working on automobiles is inherently dangerous. Moss Motors, Ltd. is not liable for injury or damage due to incorrect installation or use of their products. All products are sold with the understanding that the safe and proper installation and use of the products is the customer’s responsibility. Follow factory workshop manual procedures and instructions, but use current shop safety standards and common sense. Some tasks will require professional advice or services which Moss Motors cannot provide.Email (for Moss Tech help):
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