Service manual

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TC Series Hydraulic Brake ABS System

030.1-10

Manual Bleeding

BRAKE FLUID IS FLAMMABLE AND

TOXIC TO SKIN, EYES AND

RESPIRATORY TRACT. SKIN AND EYE

PROTECTION IS REQUIRED. AVOID

REPEATED OR PROLONGED CONTACT.

DRAIN FLUID IN A WELL-VENTILATED

AREA.

Do not let the brake master cylinder fluid

level get too low during the bleeding

operation.

1. Apply the parking brake and chock the wheels.

2. Bleed the master cylinder, see Figure 2.3—Rear

Bleeding Location.

Figure 2.3—Rear Bleeding Location

3. Loosen the fitting at the rear outlet port on the

master cylinder until the fluid begins to flow.

4. Push the brake pedal down slowly until the

pedal reaches the floor. Brake fluid and any air

in the master cylinder will discharge through the

fitting.

Do not release the brake pedal until the

fitting has been tightened. Failure to do so

will allow air bake into the system.

5. Press the brake pedal down, hand tighten the

rear hydraulic line fitting.

6. Release the brake pedal.

7. Loosen fitting again and repeat steps 1 through

8. Move to the front master cylinder and repeat all

steps 1 through 9, see Figure 2.4—Front

Bleeding Location.

Figure 2.4—Front Bleeding Location

9. Repeat all steps for left rear, right front, and left

front brakes.

10. Recheck all fluid levels and test drive vehicle for

stopping distance and brake pedal pressure.

Troubleshooting and Testing

General Maintenance Information

There is no regularly schedule maintenance required

for Meritor WABCO D version hydraulic ABS other

than checking the fluid level.

Wiring may vary, according to the vehicle. Refer to

the vehicle specifications for specific wiring

diagrams. For a typical Meritor WABCO 4S/4M

hydraulic ABS diagram, see Table 1—Pin Numbers

and Locations.