ABS issue
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ABS issue
I have a 2WD 98 expedition with a 5.4 in it. I recently replaced the calipers on the front of the truck in order to re-attain a lifetime warranty on my brake pads. I installed the loaded calipers made by Cardone.
Now the problem! I have been experiencing a high speed shudder coming from the front wheels. It is very close to violent! I have cleaned the ABS sensors on the front and bled the brakes over and over to no avail. I also replace the ABS sensor in the rear diff.
The funny thing is the brakes are not wearing uneven and if I pull the fuse the brakes operate fine. My only issue is that I will not be able to get the truck inspected to renew my tags!
Any ideas on how to fix this?
Now the problem! I have been experiencing a high speed shudder coming from the front wheels. It is very close to violent! I have cleaned the ABS sensors on the front and bled the brakes over and over to no avail. I also replace the ABS sensor in the rear diff.
The funny thing is the brakes are not wearing uneven and if I pull the fuse the brakes operate fine. My only issue is that I will not be able to get the truck inspected to renew my tags!
Any ideas on how to fix this?
Fleet Owner
Joined: Apr 2008
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Is the shudder felt in the brake pedal?
You probably already figured this out, but since pulling the fuse makes the problem go away, you can rule out mechanical issues because it's definitely ABS system related.
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I definately think that there is a problem with the ABS system! The shudder happens when applying hard pressure to the pedal and the shudder comes through the pedal. I can get the truck to stop without the shudder if I "baby" the brakes.
It occurs to me that there may be air trapped in the ABS valve body. The feeling that I get is that the brakes will let go and then grab quickly. This could be caused by the air bubble passing through one of the valves in the ABS system?
I guess what I really need to know is how do I bleed the ABS control system without taking the truck into the shop because they make my wallet bleed!
It occurs to me that there may be air trapped in the ABS valve body. The feeling that I get is that the brakes will let go and then grab quickly. This could be caused by the air bubble passing through one of the valves in the ABS system?
I guess what I really need to know is how do I bleed the ABS control system without taking the truck into the shop because they make my wallet bleed!
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Hmmmm.... I do not think that is the problem. Correct me please if I am mistaken, but is the wheel sensor ring attach to the back side of the rotor? If that is the case then when I replaced the calipers I also replaced the rotors, so they are brand new also.
Would anything else cause this?
Would anything else cause this?
Fleet Owner
Joined: Apr 2008
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I suggested the missing tooth because I ran into this problem before. Every time the owner pressed the brake pedal you could feel the ABS kick in and out to the point you would've thought the front suspension was falling out. What happens when the tooth pattern is interrupted, the ABS thinks the wheel has locked up and pulsates the brake line pressure to that wheel.
Do you still have the old rotors? If so, and if an inspection of the sensor ring on back of the new rotors reveals nothing obvious, I suggest reinstalling the old rotors to see if the problem goes away.
Do you still have the old rotors? If so, and if an inspection of the sensor ring on back of the new rotors reveals nothing obvious, I suggest reinstalling the old rotors to see if the problem goes away.
