Pressure Bleeding Procedure

BLEEDING BRAKE HYDRAULIC SYSTEM

CAUTION: Do not move the vehicle until a firm brake pedal is obtained. Air in the brake system can cause loss of brakes and could result in personal injury.

A bleeding operation is necessary to remove air from the hydraulic brake system whenever it is introduced into the hydraulic system.

It may be necessary to bleed the hydraulic system at all four brakes if air has been introduced through a low fluid level or by disconnecting brake pipes at the master cylinder. If a brake pipe is disconnected at one wheel, then that wheel cylinder/caliper only needs to be bled. If pipes are disconnected at any fitting located between master cylinder and brakes, then the brake system served by the disconnected pipe must be bled.


Pressure Bleeding

Tools Required:

J 29532 Diaphragm Type Brake Bleeder
J 29567 Brake Bleeder Adapter
J 21472 Brake Bleeder Wrench
J 35856 Proportioning Valve Depressor

NOTICE: The use of rubber hoses or parts other than those specified for the Antilock Brake System may lead to functional problems requiring major overhaul. Replace all components included in repair kits used to service this system. Lubricate rubber parts with clean, fresh brake fluid to ease assembly. Do not use lubricated shop air on brake parts as damage to rubber components may result. If any hydraulic component is removed or brake line disconnected, it may be necessary to bleed all or part of the brake system. The torque values specified are for dry, unlubricated fasteners.

NOTICE: Pressure bleeding equipment must be the diaphragm type and must have a rubber diaphragm between the air supply and the brake fluid to prevent air, moisture, oil and other contaminants from entering the hydraulic system.






1. Install J 29567 to the master cylinder (5).
2. Charge J 29532 to 140 - 172 kPa ( 20-25 psi ).
3. Connect line to adapter.
- Open line valve and depress bleed-off valve on top of adapter until a few drops of fluid appear.
4. Raise and suitably support the vehicle.
5. A manual override is required with rear drum brakes to permit fluid flow to the front wheels when pressure bleeding. Using J 35856 to hold the valve stem of combination valve open during pressure bleeding.
6. Bleed the brakes in the following sequence:
- Right rear.
- Left rear.
- Right front.
- Left front.






7. Place a proper size box end wrench or J 21472 over the bleeder valve.
8. Attach a clear tube over the valve and allow tube to hang submerged in a clear container partially filled with brake fluid.
9. Open the bleeder valve and allow fluid to flow until no air is seen in the fluid.
10. Close the bleeder valve.
- Be sure it seals.

Tighten
- Caliper bleeder valve to 13 Nm ( 115 lb. in. ).
- Wheel cylinder bleeder valve to 7 Nm ( 62 lb. in. ).

11. Repeat steps 7 through 10 until all calipers and wheel cylinders have been bled.
12. Remove J 35856 from combination valve.
13. Lower vehicle.
14. 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 conditions.
15. Remove brake bleeding equipment from master cylinder.
16. Fill master cylinder to the proper level.