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 injury.

A bleeding operation is necessary to remove air from the hydraulic brake system whenever air is introduced into the system.
It may be necessary to bleed the hydraulic system at all four brakes when air has been introduced through a low fluid level condition, or the brake pipes were disconnected at the master cylinder. When a brake pipe is disconnected at one wheel, only that wheel cylinder/caliper needs to be bled. When pipes are disconnected at any fitting located between the master cylinder and brakes, then the brake system served by the disconnected pipe must be bled.

PRESSURE BLEEDING

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 reservoirs.

TOOLS REQUIRED:
^ J 21472 Brake Bleeder Wrench
^ J 29532 Diaphragm Type Brake Bleeder
^ J 35589 Compact Brake Bleeder Adapter
^ J 28434 Wheel Cylinder Bleeder Wrench

1. Fill master cylinder reservoir to proper level.
2. Install J 35589 to the master cylinder.
3. Charge 3 29532 to 140 - 172 kPa (20 - 25 psi).
4. Connect J 29532 hose to adapter and open the line valve.
5. Raise vehicle and suitably support.
6. When bleeding all the wheel circuits, use the following sequence:
a. Right rear.
b. Left rear.
c. Right front.
d. Left front.
7. Remove bleeder valve cap and place proper size box-end wrench, J 28434 or J 21472, over caliper/cylinder 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 (115 lb. in.).

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 proper level.