Manual Bleeding

Manual Bleeding






Tool Required:
J 21472 Brake Bleeder Wrench

Notice: See "Notice". Refer to Service Precautions

Remove the vacuum reserve by applying the brakes several times, with the engine off.

1. Fill the master cylinder reservoirs with brake fluid and keep at least half full of fluid during the bleeding operation.
2. If the master cylinder is known or suspected to have air in the bore, bleed it before any wheel cylinder or caliper in the following manner:
- Disconnect the front brake combination valve pipe fitting at the master cylinder.
- Allow brake fluid to fill the master cylinder bore until it begins to flow from the front brake combination valve pipe fitting port.
- Connect the front brake combination valve pipe to the master cylinder and tighten.
- Have a helper depress the brake pedal slowly one time and hold. Loosen the front brake combination valve pipe fitting at the master cylinder to purge air from the bore. Tighten the fitting and then have a helper release the brake pedal slowly. Wait 15 seconds. Repeat the sequence, including the 15 second wait, until all air is removed from the bore. Care must be taken to prevent brake fluid from contacting any painted surface.

Tighten
- Front brake combination valve pipe fitting at master cylinder at 32 Nm (24 lb. ft.).

- After all air has been removed at the front brake combination valve pipe fitting, repeat procedure outlined above to bleed the master cylinder at the rear brake combination valve fitting.

Tighten
- Rear brake combination valve pipe fitting at master cylinder to 32 Nm (24 lb. ft.).

- If it is known that the calipers and wheel cylinders do not contain any air, it will not be necessary to bleed them.

3. Bleed individual wheel cylinders or calipers only after all air is removed from the master cylinder.
4. If it is necessary to bleed all of the wheel cylinders and calipers, follow the sequence.
- Right rear.
- Left rear.
- Right front.
- Left front.
5. Raise and suitably support vehicle.
- Place a proper size box end wrench or J 21472 over the bleeder valve.
- Attach a clear tube over bleeder valve and allow tube to hand submerged in a clear container partially filled with brake fluid.
- Have a helper depress the brake pedal slowly one time and hold. Loosen the bleeder valve to purge the air from the cylinder. Tighten bleeder valve and slowly release pedal, wait 15 seconds. Repeat the sequence, including the 15 second wait until all air is removed.

Tighten
- Caliper bleeder valve to 13 Nm (115 lb. in.).
- Wheel cylinder bleeder valve to 7 Nm (62 lb. in.).
- It may be necessary to repeat the sequence ten or more times to remove all the air.
- Rapid pumping of the brake pedal pushes the master cylinder secondary piston down the bore in a way that makes it difficult to bleed the rear side of the system.

- Lower vehicle.
- Fill master cylinder to proper level.
6. Check the brake pedal for "sponginess" and the red "BRAKE" warning lamp for indication of unbalanced pressure.
- Repeat entire bleeding procedure to correct either of these two components.