| CONDITION |
POSSIBLE CAUSES |
CORRECTION |
| BRAKES CHATTER |
1. Rear brake drum out of round or disc brake rotor has excessive thickness variation. |
1. Isolate condition as rear or front. Reface or replace brake drums or rotors as necessary. |
| BRAKES DRAG (FRONT OR ALL) |
1. Contaminated brake fluid. |
1. Check for swollen seals. Replace all system components containing rubber. |
| |
2. Binding caliper pins or bushings. |
2. Replace pins and bushings |
| - |
3. Misadjusted brake lamp switch. |
3. Replace brake lamp switch. Refer to BRAKE LAMP SWITCH
. |
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4. Master cylinder not fully returning. |
4. Inspect master cylinder and replace as necessary. |
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5. Binding brake pedal. |
5. Replace brake pedal/bushings. |
| BRAKES DRAG (REAR ONLY) |
1. Parking brake cables binding or froze up. |
1. Check cable routing. Replace cables as necessary. |
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2. Parking brake cable return spring not returning shoes. |
2. Replace cables as necessary. |
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3. Service brakes not adjusted properly (rear drum brakes only). |
3. Adjust rear brake shoes. Refer to DRUM BRAKE SHOE ADJUSTMENT
. |
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4. Obstruction inside the center console preventing full return of the parking brake cables. |
4. Remove console and remove obstruction. |
| BRAKES GRAB |
1. Contaminated brake shoe linings. |
1. Inspect and clean, or replace shoes. Repair source of contamination. |
| - |
2. Improper power brake booster assist. |
2. Refer to BOOSTER-POWER BRAKE
. |
| EXCESSIVE PEDAL EFFORT |
1. Obstruction of brake pedal. |
1. Inspect, remove or move obstruction. |
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2. Low power brake booster assist. |
2. Refer to BOOSTER-POWER BRAKE
. |
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3. Glazed brake linings. |
3. Reface or replace brake rotors as necessary. Replace brake shoes. |
| |
4. Brake shoe lining transfer to brake rotor. |
4. Reface or replace brake rotors as necessary. Replace brake shoes. |
| EXCESSIVE PEDAL EFFORT (HARD PEDAL - CAN'T SKID WHEELS) |
1. Power brake booster runout (vacuum assist). |
1. Check booster vacuum hose and engine tune for adequate vacuum supply. Refer to BOOSTER-POWER BRAKE
. |
| EXCESSIVE PEDAL TRAVEL (VEHICLE STOPS OK) |
1. Air in brake lines. |
1. Bleed brakes. |
| |
2. Rear drum brake auto-adjuster malfunctioning. |
2. Inspect and replace drum brake components as necessary. Adjust rear brakes. |
| EXCESSIVE PEDAL TRAVEL (ONE FRONT WHEEL LOCKS UP DURING HARD BRAKING) |
1. One of the two hydraulic circuits is malfunctioning. |
1. Inspect system for leaks. Check master cylinder for internal malfunction. |
| PEDAL PULSATES/SURGES DURING BRAKING |
1. Rear brake drum out of round or disc brake rotor has excessive thickness variation. |
1. Isolate condition as rear or front. Reface or replace brake drums or rotors as necessary. |
| PEDAL IS SPONGY |
1. Air in brake lines. |
1. Bleed brakes. |
| PREMATURE REAR WHEEL LOCKUP |
1. Contaminated brake shoe linings. |
1. Inspect and clean, or replace shoes. Repair source of contamination. |
| - |
2. Inoperative proportioning valve (non-ABS vehicles only). |
2. Test proportioning valves following diagnosis and testing procedure. Refer to VALVE-PROPORTIONING
. Replace valves as necessary. |
| - |
3. ABS EVBP not functioning. |
3. Refer to ABS - ELECTRICAL DIAGNOSTICS
. |
| STOP LAMPS STAY ON |
1. Brake lamp switch out of adjustment. |
1. Replace brake lamp switch. Refer to BRAKE LAMP SWITCH
. |
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2. Brake pedal binding. |
2. Inspect and replace as necessary. |
| - |
3. Power brake booster not allowing pedal to return completely. |
3. Replace power brake booster. |
| VEHICLE PULLS TO RIGHT OR LEFT ON BRAKING |
1. Frozen brake caliper piston. |
1. Replace frozen piston or caliper. Bleed brakes. |
| - |
2. Contaminated brake shoe lining (most likely front lining). |
2. Inspect and clean, or replace shoes. Repair source of contamination. |
| - |
3. Pinched brake lines. |
3. Replace pinched line. |
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4. Leaking piston seal. |
4. Replace piston seal or brake caliper. |
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5. Suspension problem. |
5. Refer to SUSPENSION
. |
| PARKING BRAKE - EXCESSIVE HANDLE TRAVEL |
1. Rear brakes out of adjustment. |
1. Adjust rear drum brake shoes, or rear parking brake shoes on vehicles with rear disc brakes. |