Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 4 - Chassis Brake General Diagnostics

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General Diagnostics


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                                           GENERAL DIAGNOSTICS
                                                                                                                             BRAKE

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




                                                            BR-53
                                      GENERAL DIAGNOSTICS
BRAKE

                                 Trouble and possible cause                          Corrective action
7. Brake noise (3)   In the case of the disc brake:
(click sound)        (1) Excessively worn pad or the support         Replace the pad or the support.
                     In the case of the drum brake:
                     (1) Excessively worn shoe ridge                 Replace the back plate.
                     (2) Lack of oil on the shoe ridge surface and   Add more grease.
                     anchor




                                                      BR-54



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