General Diagnostics - Subaru IMPREZA 2002 Service Manual

GENERAL DIAGNOSTICS
BRAKE
Trouble and possible cause
(1)
Fluid leakage from the hydraulic mechanism
20.General Diagnostics
A: INSPECTION
Corrective action
Repair or replace (cup, piston seal, piston boot,
master cylinder piston kit, pipe or hose).
1. Insufficient braking
(4)
Wear, deteriorated surface material, adhering
water or fluid on the lining
(5) Improper operation of master cylinder, disc cal-
iDer, brake booster or check valve
2. Unstable or uneven
braking
Replace, grind or clean.
Correct or replace.
3. Excessive pedal
stroke
(1) Fluid on the lining, drum or rotor
(2) Drum or rotor eccentricity
(3) Worn brake drum, or damage to the drum
caused by sand
(4) Improper lining contact, deteriorated surface
material, improper inferior material, or wear
4. Brake dragging or
improper brake return
Eliminate cause of fluid leakage, clean, or replace.
Correct or replace the drum or rotor.
Correct by grinding, or replace.
Correct by grinding, or replace.
5. Brake noise (1)
(creak sound)
(5)
Deformed back plate
(6) Improper tire inflation
(7) Disordered wheel alignment
(8) Loosened back plate or the support installing
bolts
6. Brake noise (2)
(hissing sound)
Correct or replace.
Inflate to correct pressure.
Adjust alignment.
Retighten.
(3) Fluid leakage from the hydraulic mechanism
(4) Improperly adjusted shoe clearance
(5) ImDroDer linina contact or worn linina
(2) Entry of air into the hydraulic mechanism
1
Bleed the air.
Repair or replace (cup, piston seal, piston boot,
master cylinder piston kit, pipe or hose).
Adjust.
Correct or replace.
(3) Excessively wide shoe clearance
]
Adjust the clearance.
(3) Clogged hydraulic system
(4) Improper return or adjustment of parking brake
(5) Weakened spring tension or breakage of shoe
return sDrina
Replace.
Correct or adjust.
Replace the spring.
(8) Improper adjusted wheel bearing
(1) Hardened or deteriorated lining
(2) Worn lining
(3) Loosened back plate or the support installing
bolts
Adjust or replace.
Replace the shoe assembly or pad.
Replace the shoe assembly or pad.
Retighten.
(9) Loosened wheel bearing
I
Retighten to normal tightening torque or replace.
(5) Dirty drum or rotor
(1) Worn lining
(2) ImDroDer installed shoe or Dad
(10) Trouble in the hydraulic system
(1 1) Uneven effect of the parking brake
1
Replace the cylinder, brake pipe or hose.
1
Check, adjust, or replace the rear brake and cable
Clean the drum or rotor, or clean and replace the
brake assembly.
Replace the shoe assembly or pad.
Correct or replace the shoe assembly or pad.
I
system.
1
Bleed the air. (1) Entrv of air into the hvdraulic mechanism
(2) Excessive play in the master cylinder push rod
1
Adjust.
(2) Improper master cylinder return
1
Clean or replace the cylinder.
~~~~~ ~ ~
(6) Excessively narrow shoe clearance
I
Adiust the clearance.
( 7 ) lmprouer disc caliper operation
1
Correct or replace.
(4) Loose wheel bearing
I
Retighten to normal tightening torque.
(3) Loose or bent drum or rotor
I
Retighten or replace.
BR-57