Troubleshooting
5 Brakes out of adjustment. Check the operation of the automatic ad-
justers.
6 Defective proportioning valve. Replace valve and bleed system.
69 Brake pedal feels spongy when depressed
1 Air in brake lines. Bleed the brake system.
2 Deteriorated rubber brake hoses. Inspect all system hoses and lines.
Replace parts as necessary.
3 Master cylinder mounting nuts loose. Inspect master cylinder bolts
(nuts) and tighten them securely.
4 Master cylinder faulty.
5 Incorrect shoe or pad clearance.
6 Defective check valve. Replace valve and bleed system.
7 Clogged reservoir cap vent hole.
8 Deformed rubber brake lines.
9 Soft or swollen caliper seals.
10 Poor quality brake fluid. Bleed entire system and fill with new ap-
proved fluid.
70 Excessive effort required to stop vehicle
1
Power brake booster not operating properly.
2 Excessively worn linings or pads. Check and replace if necessary.
3 One or more caliper pistons seized or sticking. Inspect and rebuild as
required.
4 Brake pads or linings contaminated with oil or grease. Inspect and re-
place as required.
5 New pads or linings installed and not yet seated. It’ll take a while for
the new material to seat against the rotor or drum.
6 Worn or damaged master cylinder or caliper assemblies. Check par-
ticularly for frozen pistons.
7 Also see causes listed under Section 69.
71 Pedal travels to the floor with little resistance
Little or no fluid in the master cylinder reservoir caused by leaking cali-
per piston(s) or loose, damaged or disconnected brake lines. Inspect en-
tire system and repair as necessary.
72 Brake pedal pulsates during brake application
1 Wheel bearings damaged, worn or out of adjustment (Chapter 1).
2 Caliper not sliding properly due to improper installation or obstruc-
tions. Remove and inspect.
3 Rotor not within specifications. Remove the rotor and check for ex-
cessive lateral runout and parallelism. Have the rotors resurfaced or re-
place them with new ones. Also make sure that all rotors are the same
thickness.
4 Out of round rear brake drums. Remove the drums and have them
turned or replace them with new ones.
73 Brakes drag (indicated by sluggish engine performance
or wheels being very hot after driving)
1 Output rod adjustment incorrect at the brake pedal.
2 Obstructed master cylinder compensator. Disassemble mastercylin-
der and clean.
3 Master cylinder piston seized in bore. Overhaul master cylinder.
4 Caliper assembly in need of overhaul.
5 Brake pads or shoes worn out.
6 Piston cups in master cylinder or caliper assembly deformed. Over-
haul master cylinder.
7 Rotor not within speciftcations (Section 72).
8 Parking brake assembly will not release.
9 Clogged brake lines.
10 Wheel bearings out of adjustment (Chapter 1).
11 Brake pedal height improperly adjusted.
12 Wheel cylinder needs overhaul.
13 Improper shoe to drum clearance. Adjust as necessary.
74 Rear brakes lock up under light brake application
1 Tire pressures too high.
2 Tires excessively worn (Chapter 1).
76 Rear brakes lock up under heavy brake application
1 Tire pressures too high.
2 Tires excessively worn (Chapter 1).
3 Front brake pads contaminated with oil, mud or water. Clean or re-
place the pads
4 Front brake pads excessively worn.
5 Defective master cylinder or caliper assembly.
Suspension
and
steering
Note: AN service procedures for the suspension and steering systems are
included in Chapter 70, unless otherwise noted.
76 Vehicle pulls to one side
1 Tire pressures uneven (Chapter 1).
2 Defective tire (Chapter 1).
3 Excessive wear In suspension or steering components (Chapter 1).
4 Wheel alignment incorrect.
5 Front brakes dragging. Inspect as described in Section 73.
6 Wheel bearings improperly adjusted (Chapter 1 or 8).
7 Wheel lug nuts loose.
77 Shimmy, shake or vibration
1 Tire or wheel out of balance or out of round. Have them balanced on
the vehicle.
3 Shock absorbers and/or suspension components worn or damaged.
Check for worn bushings In the upper and lower links.
4 Wheel lug nuts loose.
5 Incorrect tire pressures.
6 Excessively worn or damaged tire.
7 Loosely mounted Steering gear housing.
8 Steering gear improperly adjusted.
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