53 BRAKES TROUBLE SHOOTING HINTS FOR THE BRAKE SYSTEM A. SERVICE BRAKE Sr. Trouble Cause Remedy No. 1. Brake pedal is soft and spongy a. Air in brake system. a. Bleed brake system. b. Brake fluid too hot (after long b. Give brake system time to cool down gradient travel of long and if necessary, bleed. time operation of brake). c. One of both primary seals c. Replace primary seals. damaged in tandem master cylinder. d. Brake shoes worn out. d. Replace shoes. e. Soft or weak hose e. Check & replace 2. Brakes heat up when vehicle is a. Compensation port clogged a. Dis-assemble tandem master travelling or fail to release. in tandem master cylinder. cylinder and clean. b. Rubber parts swollen because b. Drain brake system and of usage of non-recommended dismantle the whole brake fluids. system. Replace all rubber parts including the brake hoses. Fill brake system with one of the approved brake fluids. c. Brake drum shoe clearance c. Check & rectify auto adjuster is more. mechanism d. Brake shoe return spring d. Replace weak/broken e. Brake drum out of true or e. Rectify scored. f. Back plate/caliper mounting f. Tighten bolts. loose. g. Slack hub bearing. g. Rectify. h. Vacuum booster piston seized h. Rectify/replace. i. Weak/broken pedal return i. Replace spring. Lubricate pivot spring. Pedal linkage binding. and linkage. 3. Unsatisfactory braking action a. Brake shoes oily or greasy. a. Rectify the cause of leakage despite hard pedal pressure and clean brake drum/disc. (normal pedal travel) Replace brake shoes/pads b. Brake shoe/pads charred. b. Replace the parts. c. Brake shoes/pads worn. c. Replace. d. Vacuum booster defective d. Rectify/Replace. e. Brake shoe/drum distorted. e. Check and rectify.
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