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Home >> Oldsmobile >> 1996 >> Eighty-Eight Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Bleeding Brake System >> Manual Bleeding

Manual Bleeding

NOTE: If BPM valve has been replaced, or it is suspected that air has been ingested into the system secondary circuits due to low fluid condition, auto bleed procedure must be performed. See ANTI-LOCK BRAKE SYSTEM article.
  1. Deplete vacuum reserve from power brake booster by depressing brake pedal several times with engine off. Fill master cylinder and keep at least half full during bleeding procedure. If master cylinder is not suspected to have air in bore, go to step 4). If master cylinder is suspected to have air in bore, go to next step.
  2. Loosen forward brakeline fitting at master cylinder until fluid begins to flow from fitting. Tighten fitting. Have an assistant slowly depress brake pedal one time and hold. Loosen forward fitting to purge air from bore. Tighten fitting while pedal is still at floor. Release brake pedal slowly. Wait 15 seconds.
  3. Repeat step 2) until fluid is clear and free of air bubbles. Repeat procedure at rearward brakeline fitting on master cylinder until air is purged from bore. Master cylinder is now bled. Tighten fitting to specification. See TORQUE SPECIFICATIONS  . If wheel cylinders/calipers are not suspected to have air in them, it is not necessary to bleed them.
    NOTE: Individual wheel cylinders/calipers can be bled only after all air is removed from master cylinder.
  4. If wheel cylinders/calipers are suspected to have air in them, raise and support vehicle. Remove bleeder valve cap from first bleeder valve to be serviced. See BRAKELINE BLEEDING SEQUENCE  table. Place wrench over bleeder valve. Attach clear vinyl bleeder hose onto bleeder valve. Place other end of hose in clean transparent container.
  5. Partially fill container with clean brake fluid so end of hose is submerged in fluid. Open bleeder valve 1-2 turns. Slowly depress brake pedal through its full travel one time and hold.
  6. Close bleeder valve and release pedal. Wait 15 seconds and repeat procedure until fluid is clear and free of air bubbles. Repeat procedure on remaining bleeder valves.
    NOTE: Use slow full strokes when pumping brake pedal. Rapid pumping of brake pedal will make procedure more difficult.
  7. Ensure brake pedal feels firm and constant, not spongy. Pressure bleed system using Tech 1 scan tool "Auto Bleed" sequence. Repeat steps 4 through 6. If pedal travel is not excessive, start engine. Recheck brake pedal again for firmness and no sponginess. If brake pedal is okay, road test vehicle, performing several normal stops from moderate speeds.
BRAKELINE BLEEDING SEQUENCE

Application Sequence
H Bodies RR, LR, RF, LF
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