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Brake System: Diagnosis Subaru Outback BS

Mechanical - Hydraulic 4 illustrations ~406 words

INSPECTION

  1. Check the caliper body cylinder and piston for uneven wear, damage or rust.
  2. Check the rubber parts for damage or deterioration.
  3. If faulty is found in the inspection, replace the relevant part.

Scheme 23

Scheme 23: REMOVAL
Scheme 23: REMOVAL

Scheme 24

Scheme 24
Scheme 24
  1. Lift up the vehicle, and then remove the rear wheels.
  2. Remove the rear brake pad. Remove the bolts and remove the brake hose bracket. Remove the caliper bolt, and raise and hold the caliper body. NOTE: Do not disconnect the brake hose from the caliper body. Remove the brake pad from support.
  1. Check the caliper body cylinder and piston for uneven wear, damage or rust.
  2. Check the rubber parts for damage or deterioration.
  3. If faulty is found in the inspection, replace the relevant part.
  1. Check that the amount of brake fluid is between the lines of "MIN" and "MAX". If out of the specified range, refill or drain the fluid. If the fluid level is close to "MIN", check the brake pad for wear and refill the fluid.
  2. Check the fluid for discoloration. If the fluid is extremely discolored, replace with the new fluid.

Check the hose for crack and damage, and also check the connection for fluid leakage. If any faulty is found, repair or replace the relevant part.

Check the pipe for crack and damage, and also check the connection for fluid leakage. If any faulty is found, repair or replace the relevant part.

Note. Use a mirror when inspecting back sides and other locations which are hard to see.

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26
  1. Disconnect the ground cable from battery.
  2. Remove the instrument panel lower cover. Remove the clips, and remove the instrument panel side cover LH. Remove the clips and data link connector, and remove the instrument panel lower cover under. Remove the bolts, and remove the knee guard panel. Remove the screws and clips and release the claws, and remove the instrument panel lower cover while disconnecting the harness connectors.
  3. Remove the brake pedal assembly. Disconnect the stop light switch connector. Remove the snap pin (a) and clevis pin (b), and remove the operating rod from the brake pedal. NOTE: Use special care when handling the operating rod. If excessive force is applied to the operating rod, the angle may change by ±3°, and it may result in damage to power piston cylinder. Do not change the push rod length. Remove the bolt and nut, and then detach the brake pedal assembly.
Trouble and possible causeCorrective action
1. Insufficient braking(1) Fluid leakage from the hydraulic mechanismRepair or replace. (cup, piston seal, piston boot, master cylinder piston kit, pipe or hose)
(2) Entry of air into the hydraulic mechanismBleed air.
(3) Wear, deteriorated surface material, water or fluid on liningReplace, grind or clean.
(4) Improper operation of master cylinder, disc caliper, brake booster or check valveRepair or replace.
2. Unstable or uneven braking(1) Fluid on lining or rotorCorrect the cause of fluid leakage, and clean or replace.
(2) Rotor defectiveRepair or replace the rotor.
(3) Improper lining contact, deteriorated surface, deteriorated or worn lining materialRepair by grinding, or replace.
(4) Deformed back plateRepair or replace.
(5) Overinflation of tiresAdjust the air pressure.
(6) Defective wheel alignmentAdjust alignment.
(7) Loose back plate or support installation boltTighten to the specified torque.
(8) Faulty wheel bearingReplace.
(9) Defective hydraulic systemReplace the cylinder, brake pipe or hose.
(10) Unstable performance of the parking brakeCheck, adjust or replace the rear brake and cable system.
3. Excessive pedal stroke(1) Entry of air into the hydraulic mechanismBleed air.
(2) Excessive play in the master cylinder push rodAdjust.
(3) Fluid leakage from the hydraulic mechanismRepair or replace. (cup, piston seal, piston boot, master cylinder piston kit, pipe or hose)
(4) Improper lining contact or worn liningRepair or replace.
4. Brake dragging or improper brake return(1) Insufficient pedal playAdjust play.
(2) Improper master cylinder returnClean or replace the cylinder.
(3) Clogged hydraulic systemReplace.
(4) Improper return or adjustment of parking brakeRepair or adjust.
(5) Weakened spring tension or breakage of shoe return springReplace the spring.
(6) Improper disc caliper operationRepair or replace.
(7) Faulty wheel bearingReplace.
5. Brake noise (1) (creaking sound)(1) Hardened or deteriorated brake padReplace the pad.
(2) Worn brake padReplace the pad.
(3) Loose back plate or support installation boltTighten to the specified torque.
(4) Loose wheel bearingTighten to the specified torque.
(5) Dirty rotorClean the rotor, or clean and replace brake assembly.
6. Brake noise (2) (hissing sound)(1) Worn brake padReplace the pad.
(2) Improperly installed padCorrect or replace the pad.
(3) Loose or bent rotorRetighten or replace.
7. Brake noise (3) (click sound)Excessively worn pad or supportReplace the pad or the support.

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