Isuzu 1999 RODEO Workshop Manual page 445

5C–8
POWER–ASSISTED BRAKE SYSTEM
Condition
Excessive Brake Pedal Travel
Brake Drag
Grabbing or Uneven Braking Action
(All conditions listed under "Pulls")
Brake Noisy
Possible cause
Air in hydraulic circuit.
Level of brake fluid in the reservoir
too low.
Master cylinder push rod clearance
excessive.
Leakage in hydraulic system.
Master cylinder pistons not returning
correctly.
Restricted brake pipes or hoses.
Parking brake maladjusted.
Parking brake lining
insufficient.
Brake pedal free play insufficient.
Piston in the master cylinder sticking.
Piston in the disc brake caliper
sticking.
Brake pads sticking in caliper.
Return spring weakened.
Parking brake binding.
Front hub bearing preload incorrect.
Parking brake shoes not returning.
Obstructions in hydraulic circuit.
Rotor warped excessively.
Rear brake drum distorted.
Parking cable sticking.
Malfunctioning vacuum booster.
Binding brake pedal mechanism.
Corroded caliper assembly.
Brake pads are worn.
Brake pads are hardened.
Brake pads are in poor contact with
rotor.
Brake disc(s) warped, worn or
damaged.
Disc brake anti–squeak
fatigued.
Front hub bearings are loose or
preload is incorrect.
Brake disc is rusted.
Correction
Bleed the hydraulic circuit.
Replenish brake fluid reservoir to
specified level and bleed hydraulic
circuit as necessary.
Adjust
Correct or replace defective parts.
Adjust the stop light switch and
vacuum booster push rod. If
necessary, rebuild.
Check for soft hoses or damaged
pipes, and replace with new hoses
and new double–walled steel brake
piping.
Adjust
clearance Adjust
Adjust the brake pedal height or
power cylinder operating rod.
Replace
Replace piston seals.
Clean
Replace
Overhaul the parking brakes and
correct.
Adjust or replace.
Correct or replace the brake back
plate and brake shoe as necessary.
Clean
Grind or replace.
Grind or replace.
Grind or replace.
Check operation and correct as
necessary.
Check and lubricate, if necessary.
Clean and lubricate.
Replace
Replace
Correct
Grind or replace.
shims Replace
Adjust or replace.
Grind or replace.