Diesel Data: Automotive Repair

Manual Bleeding

Note: Correct manual bleeding of the brakes hydraulic system will require the aid of a helper.

Note: The following wheel sequence should be used when bleeding the brake hydraulic system. The use of this wheel sequence will ensure adequate removal of all trapped air from the brake hydraulic system.
- Left Rear Wheel
- Right Front Wheel
- Right Rear Wheel
- Left Front Wheel

Caution: Slightly opening the bleeder screw often restricts the flow of brake fluid. A slow weak flow of brake fluid from the bleeder screw will NOT get all the air out.

1. Pump the brake pedal three or four times and hold it down before the bleeder screw is opened.
2. Push the brake pedal toward the floor and hold it down. Then open the left rear bleeder screw at least 1 full turn. When the bleeder screw opens the brake pedal will drop all the way to the floor.
3. Release the brake pedal only after the bleeder screw is closed.
4. Repeat steps 1 through 3, four or five times, at each bleeder screw in the required sequence. This should pass a sufficient amount of fluid to expel all the trapped air from the brake system. Be sure to monitor the fluid level in the master cylinder, so it stays at, a proper level so air will not enter the brake system through the master cylinder.
5. Test drive the vehicle to be sure the brakes are operating correctly and a solid brake pedal has been obtained.