Base Brake Bleeding
BASE BRAKE BLEEDING
Special Tools:
NOTE: This brake bleeding procedure covers the following:
- PRESSURE BLEEDING PROCEDURE
- MANUAL BLEEDING PROCEDURE
- IPB CALIPER BRAKE BLEEDING PROCEDURE
NOTE: This bleeding procedure is only for the vehicle's base brakes hydraulic system. For bleeding the antilock brakes hydraulic system, Service and Repair
CAUTION: Before removing the master cylinder reservoir cap, thoroughly clean the cap and master cylinder fluid reservoir to prevent dirt and other foreign matter from dropping into the master cylinder fluid reservoir.
NOTE: The following wheel sequence should be used when bleeding the brake hydraulic system. The use of this wheel sequence will ensure adequate removal of all trapped air from the brake hydraulic system.
- Left Rear Wheel
- Right Front Wheel
- Right Rear Wheel
- Left Front Wheel
NOTE: When bleeding the brake system, some air may be trapped in the brake lines far upstream, as much as ten feet from the bleeder screw. Therefore, it is essential to have a fast flow of a large volume of brake fluid when bleeding the brakes to ensure all the air gets out.
Pressure bleeding the brakes is recommended, although the brakes may be manually bled or pressure bled. Refer to the appropriate following procedure.
PRESSURE BLEEDING PROCEDURE
Follow the pressure bleeder manufacturer's instructions for use of the pressure bleeding equipment.
1. Install (6921) on the master cylinder fluid reservoir. Attach the fluid hose from the pressure bleeder to the fitting on (6921).
2. Attach a clear plastic hose (1) to the bleeder screw and feed the hose into a clear jar (2) containing enough fresh brake fluid to submerge the end of the hose.
3. Open the bleeder screw at least one full turn or more to obtain a steady stream of brake fluid.
4. After approximately 120-240 ml (4-8 ounces) of fluid have been bled through the brake circuit and an air-free flow is maintained in the clear plastic hose and jar, close the bleeder screw.
5. Repeat this procedure at all the remaining bleeder screws.
6. Check and adjust brake fluid level to the FULL mark on the reservoir.
7. Check brake pedal travel and feel. If pedal travel is excessive or if the pedal feels excessively spongy, some air may still be trapped in the system. Re-bleed the brakes as necessary including the IPB Caliper Brake Bleeding Procedure on the rear calipers as listed below.
8. Test drive the vehicle to verify the brakes are operating properly and pedal feel is correct.
MANUAL BLEEDING PROCEDURE
NOTE: To bleed the brakes manually, the aid of a helper will be required.
1. Attach a clear plastic hose (1) to the bleeder screw and feed the hose into a clear jar (2) containing enough fresh brake fluid to submerge the end of the hose.
2. Have a helper pump the brake pedal three or four times and hold it in the down position.
3. With the pedal in the down position, open the bleeder screw at least one full turn.
4. Once the brake pedal has dropped, close the bleeder screw. After the bleeder screw is closed, release the brake pedal.
5. Repeat the above steps until all trapped air is removed from that wheel circuit (usually four or five times).
6. Bleed the remaining wheel circuits in the same manner until all air is removed from the brake system. Monitor the fluid level in the master cylinder reservoir to make sure it does not go dry.
7. Check and adjust brake fluid level to the FULL mark.
8. Check brake pedal travel and feel. If pedal travel is excessive or if the pedal feels excessively spongy, some air may still be trapped in the system. Re-bleed the brakes as necessary including the IPB Caliper Brake Bleeding Procedure on the rear calipers as listed below.
9. Test drive the vehicle to verify the brakes are operating properly and pedal feel is correct.
IPB CALIPER BRAKE BLEEDING PROCEDURE
NOTE: The following procedure is normally only necessary if a rear brake caliper has been removed and installed, or replaced.
Perform the following procedure on each rear brake caliper as necessary.
1. Raise and support vehicle. Maintenance
2. Remove the wheel mounting nuts (3), then the tire and wheel assembly (1).
3. Remove the brake caliper lower guide pin bolt (1).
4. Swing the caliper assembly upward, pivoting off the upper guide pin, until clear of the adapter bracket.
5. Remove the outboard pad (5) from the adapter bracket.
6. Return the caliper back down over the adapter bracket into mounted position and install the lower guide pin bolt finger tight.
7. Slowly pump the brake pedal until the caliper fingers touch the outboard surface of the brake rotor. Release the pedal.
8. Remove the brake caliper lower guide pin bolt.
9. Swing the caliper assembly upward, pivoting off the upper guide pin, until clear of the adapter bracket.
10. Open the caliper bleeder screw at least one full turn.
11. Seat (bottom) the caliper piston in the bore as follows:
a. Assemble a 3/8 in. drive ratchet handle and an extension (3).
b. Insert the extension through (8807-1) (2).
c. Place (8807-2) (1) on the end of the extension.
d. Insert lugs on (8807-2) into notches in face of caliper piston (5).
e. Thread the screw drive on (8807-1) down until it contacts the top of (8807-2) which is against the caliper piston. Do not over tighten the screw-drive. Damage to the piston can occur.
f. Turn (8807-2) with the ratchet, rotating the piston in a clockwise direction until fully seated (bottomed) in the bore. It may be necessary to turn (8807-1)with (8807-2) to start the process of piston retraction.
NOTE: 12 is only necessary if there are pins on the back of the brake pad.
12. While retracting the piston in the caliper (2), make sure the slots (1) in the piston are aligned as shown so the pin on the back of the brake pad will line up with the slot.
13. Close the bleeder screw.
14. Reinstall the outboard pad in the adapter bracket.
15. Return the caliper back down over the adapter bracket into mounted position and install the lower guide pin bolt finger tight.
16. Have a helper pump the brake pedal three or four times and hold it in the down position.
17. With the pedal in the down position, open the bleeder screw at least one full turn and let out fluid and air, if any.
18. Once the brake pedal has dropped, close the bleeder screw. Once the bleeder screw is closed, release the brake pedal.
19. Repeat the previous three steps until all trapped air is removed.
20. Tighten the guide pin bolt to 35 Nm (26 ft. lbs.).
21. Repeat the above procedure on the opposite rear brake caliper as necessary.
22. Check brake pedal travel and feel. If pedal travel is still excessive or if the pedal feels excessively spongy, repeat the entire procedure as necessary.
23. Install the tire and wheel assembly . Tires And Wheels - Installation Install and tighten wheel mounting nuts to 135 Nm (100 ft. lbs.).
24. Lower the vehicle.
25. Test drive the vehicle to verify the brakes are operating properly and pedal feel is correct.