If the master cylinder has been emptied of fluid or replaced, it must be bled separately from the rest of the system. Since the cylinder has no check valve, air can become trapped within it. To bleed the brake master cylinder after it has been drained, proceed as follows:
- Disconnect the 2 brake lines from the master cylinder. Plug the lines immediately. The brake fluid reservoir should be in place and connected to the master cylinder. Check the fluid level before beginning.
- An assistant should slowly depress and hold the brake pedal.
- With the pedal held down, use 2 fingers to plug each outlet port on the master cylinder and release the brake pedal.
- Repeat Steps 2 and 3 three or four times. The air will be bled from the cylinder.
- Connect the brake lines to the master cylinder and tighten the fittings.
- Start the engine, allowing the system to pressurize and self-check. Shut the ignition OFF and bleed the brake lines.
LINES & CALIPERS
The brake system must be bled any time a line, hose or component is loosened or removed. Any air trapped within the lines can affect pedal feel and system function. Bleeding the system is performed in the usual manner with an assistant in the car to pump the brake pedal. Make certain the fluid level in the reservoir is maintained at or near correct levels during bleeding operations.
The individual lines may be bled manually at each wheel using the traditional 2 person method.
- The ignition must remain OFF throughout the bleeding procedure.
- The system should be bled in the following order: Right rear, left front, left rear and right front.
- Connect a transparent hose to the caliper bleed screw. Submerge the other end of the hose in clean brake fluid in a clear glass container.
- Slowly pump the brake pedal several times. Use full strokes of the pedal and allow 5 seconds between strokes. After 2 or 3 strokes, hold pressure on the pedal keeping it at the bottom of its travel.
- With pressure held on the pedal, open the bleed screw 1 / 2 - 3 / 4 turn. Leave the bleed screw open until fluid stops flowing from the hose. Tighten the bleed screw and release the pedal.
- Repeat Steps 3 and 4 until air-free fluid flows from the hose. Tighten the caliper bleed screw to 7.5 ft. lbs. (10 Nm).
- Repeat the sequence at each remaining wheel.
Check the fluid level in the reservoir frequently and maintain it near the full level.
- When bleeding is complete, bring fluid level in the reservoir to the correct level. Install the reservoir cap.