HYDRAULICS 1.95 BRAKE SYSTEM BLEEDING General Bleed the brake system after a brake system component change and when air in the system is suspected. Air in the system will not allow the brakes to release properly and may cause damage . 1. Start the engine and allow the accumulator to fully charge. 2. Stop the engine. Slowly apply and release brakes until they will not apply, waiting for one minute between applications. Repeat this operation three times. 3. Start the engine and allow the accumulator to fully charge then stop the engine. Operate the engine as necessary to maintain accumulator at working pressure throughout the bleeding procedure. 4.
Attach a bleed tube to the bleed screw (1) on the brake unit nearest to the brake valve (front right) and put the bleed tube into a suitable container. Carefully open bleed screw (1), apply brakes until all air is bled out of line then close bleed screw (1) and remove bleed tube. Bleed the other brake units and the trailer brake valve in the order that follows: A. Front left (2) B. Rear right (3) C. Rear left (4) D. Trailer brake valve (5) 5. Release brake pressure for at least one minute. 6. Apply brakes, hold pedal down for ten seconds then release pressure for one minute. Repeat this operation two more times. 7. Bleed the brakes one more time. 8.
Check the system components and brake lines for leaks. 9. Test the operation of the brakes.