4A
Brakes Symptom Diagnosis
Condition Possible Cause Action
Not enough braking force
Brake fluid leakage from brake lines
Locate leaking point and repair.
Brake disc or pads stained with oil
Clean or replace.
Overheated brakes
Determine cause and repair.
Poor contact of shoes on brake drum
Repair for proper contact.
Brake shoes linings stained with oil or wet with water
Replace.
Badly worn brake shoe linings
Replace.
Defective wheel cylinders
Repair or replace.
Malfunctioning caliper assembly
Repair or replace.
Air in system
Bleed system.
Maladjusted sensor spring length of LSPV
Check or adjust.
Broken sensor spring of LSPV
Replace.
Defective cooler of LSPV
Replace.
Malfunctioning ABS (Antilock brake system), if equipped
Check system and replace as necessary.
Brake pull (Brakes not working in unison)
Pad and/or shoe linings are wet with water or stained with oil in some brakes
Replace.
Drum-to-shoe clearance out of adjustment in some brakes (Malfunctioning auto adjusting mechanism)
Check for inoperative auto adjusting mechanism.
Disc and/or drum is out of round in some brakes
Replace.
Wheel tires are inflated unequally
Inflate equally.
Malfunction in wheel cylinders
Repair or replace.
Disturbed front wheel alignment
Adjust as prescribed.
Unmatched tires on same axle
Tires with approximately the same amount of tread should be used on the same axle.
Restricted brake tubes or hoses
Check for soft hoses and damaged lines. Replace with new hoses and new double-walled steel brake tubing.
Malfunctioning caliper assembly
Check for stuck or sluggish pistons and proper lubrication of caliper slide bush.
Loose suspension parts
Caliper should slide.
Check and torque bolts to specifications.
Loose calipers
Check and torque bolts to specifications.
Noise (high pitched squeak without brake applied)
Front lining worn out
Replace brake pads.
Rear brake locked prematurely
Maladjusted sensor spring length of LSPV
Check or adjust.
Malfunction LSPV assembly
Replace assembly.
Brake locked (For vehicle equipped with ABS)
Malfunctioning ABS, if equipped
Check system referring to ABS Check .
Excessive pedal travel (Pedal stroke too large)
Partial brake system failure
Check brake systems and repair as necessary.
Insufficient fluid in master cylinder reservoirs
Fill reservoirs with approved brake fluid.
Air in system (soft / spongy pedal)
Bleed system.
Rear brake system not adjusted (malfunctioning auto adjusting mechanism)
Repair auto adjusting mechanism.
Bent brake shoes
Replace brake shoes.
Worn rear brake shoes
Replace brake shoes.
Dragging brakes (A very light drag is present in all brakes immediately after pedal is released)
Master cylinder pistons not returning correctly
Replace master cylinder.
Restricted brake tubes or hoses
Check for soft hoses or damaged tubes and replace with new hoses and/or new brake tubes.
Incorrect parking brake adjustment on rear brakes
Check and adjust to correct specifications.
Weakened or broken return springs in the brake
Replace.
Sluggish parking brake cables or linkage
Repair or replace.
Wheel cylinder or caliper piston sticking
Repair as necessary.
Malfunctioning ABS, if equipped with ABS
Check system and replace as necessary.
Pedal pulsation (Pedal pulsates when depressed for braking)
Damaged or loose wheel bearings
Replace wheel bearings.
Distorted steering knuckle or rear axle shafts
Replace knuckle or rear axle shaft.
Excessive disc lateral runout
Check per instructions. If not within specifications, replace or machine disc.
Parallelism not within specifications
Check per instructions. If not with specifications, replace or machine disc.
Rear drums out of round
Check runout.
Braking noise
Glazed shoe linings, or foreign matters stuck to linings
Repair or replace shoe linings.
Worn or distorted shoe linings
Replace shoe lining (or pad).
Loose front wheel bearings
Replace wheel bearings.
Distorted backing plates or loose mounting bolts
Replace or retighten securing bolts.
Brake warning lamp lights after engine start
Parking brake applied
Release parking brake and check that brake warning lamp turns off.
Insufficient amount of brake fluid
Add brake fluid.
Brake fluid leaking from brake line
Investigate leaky point, correct it and add brake fluid.
Brake warning lamp circuit faulty
Repair circuit.
Brake warning lamp turns on when brake is applied
Brake fluid leaking from brake line
Investigate leaky point, correct it and add brake fluid.
Insufficient amount of brake fluid
Add brake fluid.
Faulty P & Differential valve (Differential switch)
Replace.
Brake warning lamp fails to turn on even when parking brake is applied
Bulb burnt out
Replace bulb.
Brake warning lamp circuit open
Repair circuit.
ABS warning lamp does not turn on for 2 sec. after ignition switch has turned ON
Bulb burnt out
Replace bulb.
ABS warning lamp circuit open, if equipped with ABS (including check relay)
Check system referring to ABS Check .
ABS warning lamp remains on after ignition switch has turned on for 2 sec.
Malfunctioning ABS, if equipped with ABS
Check system referring to ABS Check .