Bleeding brakes...
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New User
Joined: Mar 2007
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Bleeding brakes...
I have a 1996 F250 PSD 4x4. I have recently done some work on the brakes. After putting everything back together I bled the brakes per the instructions I read here on FTE. However, my manual says that after the system has been bled that "it will be necessary to centralize pressure in the differential valve."
My questions are:
1. What is the differential valve and what does it do, and,
2. How do I centralize pressure?
Thanks a lot,
Nate
My questions are:
1. What is the differential valve and what does it do, and,
2. How do I centralize pressure?
Thanks a lot,
Nate
Elder User
Joined: Feb 2006
Posts: 592
Likes: 1
"Centralizing the Pressure
Differential Valve
After any repair or bleeding of the primary (front brake) or secondary (rear brake) system, the dual-brake system warning light will usually remain illuminated due to the pressure differential valve remaining in the off-center position.
To centralize the pressure differential valve and turn off the warning light after the systems have been bled, follow the procedure below.
1. Turn ignition switch to the ACC or ON position.
2. Check the fluid level in the master cylinder reservoirs and fill them to within 1/4 in. of the top with brake fluid, if necessary.
3. Depress the brake pedal and the piston should center itself causing the brake warning light to go out.
4. Turn the ignition switch to the OFF position.
5. Before driving the vehicle, check the operation of the braked and be sure that a firm pedal is obtained."
Differential Valve
After any repair or bleeding of the primary (front brake) or secondary (rear brake) system, the dual-brake system warning light will usually remain illuminated due to the pressure differential valve remaining in the off-center position.
To centralize the pressure differential valve and turn off the warning light after the systems have been bled, follow the procedure below.
1. Turn ignition switch to the ACC or ON position.
2. Check the fluid level in the master cylinder reservoirs and fill them to within 1/4 in. of the top with brake fluid, if necessary.
3. Depress the brake pedal and the piston should center itself causing the brake warning light to go out.
4. Turn the ignition switch to the OFF position.
5. Before driving the vehicle, check the operation of the braked and be sure that a firm pedal is obtained."
