Manual Bleeding
- 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 known or suspected to have air in bore and is not equipped with ABS, go to step 4). If master cylinder is known or suspected to have air in bore or is equipped with ABS, go to next step.
- Loosen forward brakeline fitting at master cylinder until fluid begins to flow from fitting. Tighten fitting to specification. See TORQUE SPECIFICATIONS. Have an assistant depress brake pedal slowly and hold. Loosen forward fitting. Tighten fitting while pedal is still at floor. Release brake pedal slowly. Wait 15 seconds.
- Repeat step 2) until fluid is clear and free of air bubbles. Repeat procedure at rearward brakeline fitting on master cylinder. Master cylinder is now bled. If wheel cylinders/calipers are not known or suspected to have air in them, it is not necessary to bleed them.
- If wheel cylinders/calipers are known or 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.
- 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.
- Close bleeder valve and release pedal. Pump pedal several times to push air toward wheel cylinder/caliper. Wait 15 seconds and repeat procedure until fluid is clear and free of air bubbles. Repeat procedure on remaining bleeder valves.
BRAKELINE BLEEDING SEQUENCE
| Application | Sequence |
|---|---|
| Bonneville, DeVille/Sixty-Special, Eighty-Eight, LeSabre, Ninety-Eight and Park Avenue | RR, LR, RF, LF |
| Eldorado, Riviera and Seville | LF, RF, LR, RR |