Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy the highest quality brake fluid that is available. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Any brake fluid that is removed from the system should be discarded. Also, do not allow any brake fluid to come in contact with a painted surface; it will damage the paint.
Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes and wash your hands thoroughly after handling brake fluid. If you do get brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY seek medical assistance.
- Remove the air cleaner cover and hose, as necessary.
- Use a syringe or turkey baster to remove as much fluid as you can from the master cylinder reservoir.
- Detach the electrical connector from the master cylinder.
- Disconnect the brake lines from the master cylinder using a flare nut wrench. Cap or plug the lines immediately to prevent foreign debris from entering or contamination.
- Remove the master cylinder-to-booster mounting nuts and remove the master cylinder from the vehicle, being careful not to spill or drip any brake fluid that's still in the reservoir.
- Installation is the reverse of the removal procedure. Tighten the mounting nuts to 9 ft. lbs. (13 Nm) and the brake lines to 11 ft. lbs. (15 Nm).
- Fill the reservoir with fluid then bleed the brake system.
All new master cylinders should be bench bled prior to installation. Bleeding a new master cylinder on the vehicle is not a good idea. With air trapped inside, the master cylinder piston may bottom in the bore and possibly cause internal damage.
- Secure the master cylinder in a bench vise using soft jaws.
- Remove the master cylinder reservoir cap.
- Manufacture or purchase bleeding tubes and install them on the master cylinder as illustrated.
- Fill the master cylinder reservoir with clean, fresh brake fluid until the level is within 0.25 in. of the reservoir top.
Ensure the bleeding tubes are below the level of the brake fluid, otherwise air may get into the system making your bleeding efforts ineffective.
- Use a blunt tipped rod (a long socket extension works well) to slowly depress the master cylinder piston. Make sure the piston travels full its full stroke.
- As the piston is depressed, bubbles will come out of the bleeding tubes. Continue depressing and releasing the piston until all bubbles cease.
- Refill the master cylinder with fluid.
- Remove the bleeding tubes.
- Install the master cylinder reservoir cap.
- Install the master cylinder on the vehicle.