Pressure Bleeding

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 with possible personal injury.

Whenever air gets into the brake hydraulic system, you must bleed the system to remove it. You might have to bleed the hydraulic system at all four wheel positions if air has entered the system due to low fluid level, or from brake pipes having been disconnected at the master cylinder. If a brake pipe is disconnected at one wheel, only that wheel cylinder/caliper needs to be bled. if pipes are disconnected at any fitting located between the master cylinder and the wheels, then the brake system served by the disconnected pipe must be bled.

PRESSURE BLEEDING MANUALLY

Fig. 1 Wheel Cylinder Bleeding:

Pressure Bleeding Adaptor:

NOTICE: Pressure bleeding equipment must be of the diaphragm type. It 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.

IMPORTANT: The correct master cylinder bleeder adapter must be used to avoid possible damage to the master cylinder reservoir.

ADJUST

TOOLS REQUIRED:
^ J 21472 Bleeder Wrench
^ J 28434 Bleeder Wrench
^ J 29532 Bleeder Ball
^ J 35589 Bleeder Adapter

1. Fill master cylinder reservoir to full mark using only Delco Supreme II Brake Fluid, or equivalent DOT-3 brake fluid.
2. Install J 35589 bleeder adapter to the master cylinder.
3. Charge J 29532 to 140 to 172 kPa (20 to 25 psi).
4. Connect J 29532 hose to adapter and open the line valve.
5. Raise vehicle and suitably support.
6. If you must bleed all the wheel circuits, use the following sequence: Right rear, left rear, right front, and then left front.
7. Remove bleeder valve cap and place proper size box-end wrench, or J 21472 / J 28434. over bleeder valve.
8. Attach a transparent tube to bleeder valve, submerge other end of tube in a clear container partially filled with clean brake fluid.
9. Loosen bleeder valve at least 3/4 turn, and allow fluid to flow until no air is seen in the fluid.
10. Tighten bleeder valve.

TIGHTEN
^ Wheel cylinder bleeder valve to 7 Nm (62 lb. in.).
^ Caliper bleeder valve to 13 Nm (10 lb. ft.).

11. Repeat Steps 7 through 10 until all calipers/cylinders have been bled. Then install bleeder valve caps.
12. Lower vehicle.
13. Check brake pedal for "sponginess". Repeat entire bleeding procedure to correct "sponginess".
14. Remove J 29532 and J 35589.
15. Fill master cylinder to full mark.