Subaru Legacy 2004 Service Manual page 3257

16.Diagnosis
A: INSPECTION
1. Insufficient braking (1) Fluid leakage from the hydraulic mechanism
(2) Entry of air into the hydraulic mechanism
(3) Wear, deteriorated surface material, adhering water or
fluid on the lining
(4) Improper operation of master cylinder, disc caliper,
brake booster or check valve
2. Unstable or uneven (1) Fluid on the lining or rotor
braking
(2) Rotor eccentricity
(3) Improper lining contact, deteriorated surface material,
improper inferior material, or wear
(4) Deformed back plate
(5) Improper tire inflation
(6) Disordered wheel alignment
(7) Loosened back plate or the support installing bolts
(8) Faulty wheel bearing
(9) Trouble in hydraulic system
(10) Uneven effect of the parking brake
3. Excessive pedal (1) Entry of air into the hydraulic mechanism
stroke
(2) Excessive play in the master cylinder push rod
(3) Fluid leakage from the hydraulic mechanism
(4) Improper lining contact or worn lining
4. Brake dragging or (1) Insufficient pedal play
improper brake
(2) Improper master cylinder return
return
(3) Clogged hydraulic system
(4) Improper return or adjustment of parking brake
(5) Weakened spring tension or breakage of shoe return
spring
(6) Improper disc caliper operation
(7) Faulty wheel bearing
5. Brake noise (1) (1) Hardened or deteriorated brake pad
(creak sound)
(2) Worn brake pad
(3) Loosened back plate or the support installing bolts
(4) Loose wheel bearing
(5) Dirty rotor
6. Brake noise (2) (1) Worn brake pad
(hissing sound)
(2) Improper installed pad
(3) Loose or bent rotor
7. Brake noise (3) Excessively worn pad or the support
(click sound)
Diagnosis
Trouble and possible cause
BR-47
Corrective action
Correct or replace. (cup, piston seal, piston
boot, master cylinder piston kit, pipe or
hose)
Bleed air.
Replace, grind or clean.
Correct or replace.
Eliminate cause of fluid leakage, and clean
or replace.
Correct or replace the rotor.
Correct by grinding, or replace.
Rectify or replace.
Adjust to correct pressure.
Adjust alignment.
Retighten to specified torque.
Replace.
Replace the cylinder, brake pipe or hose.
Check, adjust, or replace the rear brake
and cable system.
Bleed air.
Adjust.
Correct or replace. (cup, piston seal, piston
boot, master cylinder piston kit, pipe or
hose)
Correct or replace.
Adjust play.
Clean or replace the cylinder.
Replace.
Correct or adjust.
Replace the spring.
Correct or replace.
Replace.
Replace the pad.
Replace the pad.
Retighten to specified torque.
Retighten to specified torque.
Clean the rotor, or clean and replace brake
assembly.
Replace the pad.
Correct or replace the pad.
Retighten or replace.
Replace the pad or the support.
BRAKE