It will be necessary to have the help of an assistant during this procedure.
The hydraulic brake system must be bled whenever a fluid line has been disconnected because air gets into the system. A leak in the system may sometimes be indicated by a spongy brake pedal. Air trapped in the system is compressible and does not permit the pressure applied to the brake pedal to be transmitted solidly to the brake shoe and drum surfaces. The system must be absolutely free from air at all times. When bleeding brakes, bleed at the wheel most distant from the master cylinder first, the next most distant second, and so on. During the bleeding operation the master cylinder must be kept at least 3 / 4 full of brake fluid; if the fluid level falls too low air can get into the system through the master cylinder.
To bleed the brakes:
- Carefully clean all dirt from around the master cylinder filler cap.
If a bleeder tank is to be used, follow the manufacturer's instructions.
- Remove the filler cap and fill the master cylinder to within 1 / 4 in. (6mm) of the top of the master cylinder.
- Clean off the bleeder valve nipples at all four wheel cylinders.
- Attach a clear plastic bleeder hose to the right rear wheel cylinder bleeder screw and place the other end of the tube in a glass jar, submerged in brake fluid.
- Open the bleeder valve 1 / 2 - 3 / 4 of a turn while keeping the other end of the bleeder hose submerged in the brake fluid in the jar.
- Have an assistant depress the brake pedal SLOWLY and allow it to return. Continue this pumping action to force any air out of the system.
- When bubbles cease to appear at the end of the bleeder hose submerged in the brake fluid, close the bleeder valve and remove the hose.
- Check the level of fluid in the master cylinder reservoir and replenish as necessary.
- Proceed to the left rear wheel cylinder and repeat Steps 3-8.
- After bleeding the left rear wheel cylinder, move on to the right front wheel cylinder and repeat Steps 3-8 once again.
- Finally move on to the left front wheel cylinder and bleed it as with the other three wheels (Steps 3-8).
- After the bleeding operation at each wheel cylinder is complete, fill the master cylinder reservoir and replace the filler plug.
- Dispose of the brake fluid in the jar, used during the bleeding process, because it is contaminated with air bubbles and dirt.
- Before servicing the vehicle, refer to the Precautions section.
Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
CAUTIONBrake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes. Wash hands thoroughly after handling. If brake fluid contacts the eyes, flush the eyes for 15 minutes with cold running water. Get medical attention if irritation persists. If taken internally, drink water and induce vomiting. Get medical attention immediately. Failure to follow these instructions may result in personal injury.
WARNINGIf brake fluid is spilled on the paintwork, the affected area must be immediately washed down with cold water.
NOTEMake sure that the vehicle is standing on a level surface.
NOTEThe system consists of separate circuits for each front and diagonally opposite rear wheel. Each circuit can be bled independently.
WARNINGThe brake fluid reservoir must remain full with new, clean brake fluid at all times during bleeding.
- Install the bleed tube to the bleed nipple.
- Immerse the end of the bleed tube in a bleed jar containing a small quantity of approved brake fluid.
- Position the bleed jar base at least 12 inches (300 mm) above the bleed nipple to maintain fluid pressure and prevent air leaking past the threads of the bleed nipple.
- Loosen the bleed nipple by one-half turn.
- Operate the brake pedal fully (pumping brake fluid and air into the bleed jar) and allow the brake pedal to return to the rest position.
- Fill the brake fluid reservoir to the MAX mark.
- Continue operating the brake pedal until air-free fluid is being pumped into the bleed jar.
With the brake pedal fully depressed tighten the bleed nipple.
WARNINGMake sure the bleed nipple cap is installed after bleeding the brake line(s). This will prevent corrosion to the bleed nipple. Failure to follow this instruction may result in the bleed nipple becoming seized.
- Repeat the procedure for the remaining brake lines.
- Connect the battery ground cable.