Bad RABS valve = bad pedal ??
Thread Starter
|
Freshman User
Joined: Jun 2008
Posts: 31
Likes: 0
Bad RABS valve = bad pedal ??
1992 F250 4x4. Can a bad RABS valve cause a soft and low pedal? The truck will stop but the pedal keeps going down. I have done a Search and found other probable causes. However, I need to know if it is at all possible that a bad RABS valve can cause the above symptom.
thanks and Happy Trucking
thanks and Happy Trucking
Elder User
Joined: May 2007
Posts: 544
Likes: 1
It is possible, but they way your describing the pedal makes me suspect a master cylinder bypassing internally. One way to test that is to leave the engine off and pump up the brake pedal till it's firm and then keep your foot on it and see if it's still going down.
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
A defective solenoid in the RABS valve body can cause a sinking pedal. The valve body is on the inside of the left side frame rail around where the drivers feet would be. If you want you can remove the large hex plug on the end of the valve (under spring pressure all the way off). Remove the spring and replace the hex plug. Pump the pedal a few times to fill the chamber with fluid. If the pedal no longer sinks you know the RABS valve boby is faulty. If it still sinks put the spring back in and look elsewhere. You can still drive the truck without the spring you just will not have ABS. Good luck.
Thread
Thread Starter
Forum
Replies
Last Post
WEST AUSSIE 94 250
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
30
Oct 20, 2024 11:36 AM
leftystar
1987 - 1996 F150 & Larger F-Series Trucks
4
Feb 8, 2017 08:28 PM
EYEDEYE
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
13
Oct 25, 2015 08:45 PM
burnout400m
1987 - 1996 F150 & Larger F-Series Trucks
35
Mar 22, 2012 08:46 PM
krl13
Brakes, Steering, Suspension, Tires, & Wheels
1
Jul 30, 2008 07:57 PM
