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.




