pleeez help
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Freshman User
Joined: Feb 2007
Posts: 36
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pleeez help
Hello to all. I replaced the front brakes on my wifes 05 sport trac sat because of warped rotors. Had rotors machined and bought duralast gold c max pads all went good but went to drive and when truck is about to come to complete stop the petal surges and goes fwd a little towards floor but will stop the truck. It only does this when when light presure coming to a stop feels like air in lines so I bled all four and didnt work so I took rotors back off and cleaned sensors still no better.I did some experimenting, I held throttle above 1000 rpm and could not get it to do this. Can someone please help me
Hotshot
Joined: Jul 2005
Posts: 11,931
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i had rotors turned on my F150 several years ago and still did that. I checked thickness and they varied .004 in thickness around the disc. That made it pulse at low speed... Im guessing eventually you will install NEW discs.
Logistics Pro
Joined: Jun 2009
Posts: 4,809
Likes: 83
From: Cedar Rapids, IA
Is the "surge" a single surge, or is it a pulsation that happens at a rate proportional to wheel speed? When installing the rotors did you clean the mating surfaces of all debris? It's pretty easy for a chunk of rust to fall from one of the rotor vents and come to rest between the rotor and hub which will cause a pulsation. Depending on the size of the debris it can lead to a pretty sizable pulsation. Also, did you properly torque the wheels when putting them back on (probably 100 ft-lbs in a star pattern) or just crank them on? If the rotors are thin they will be more prone to warping.
-Rod
-Rod
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Freshman User
Joined: Feb 2007
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OK, problem is fixed,Im a dummy. When I was installing new seals with dead blow hammer I must have moved the exciter rings for ABS and that was causing the pulsing petal.Thanks to all I very much appreciate it
Logistics Pro
Joined: Jun 2009
Posts: 4,809
Likes: 83
From: Cedar Rapids, IA
Thank you for the follow up. So you also had an ABS light on? If the pulsation was due to a problem with the exciter ring, enough to cause the ABS to engage when coming to a stop, I would expect the ABS to pick up on this and trigger a diagnostic code.
What method did you use to reposition the exciter ring back to where it should be? Those are typically quite fragile and knowing how to move it may prove useful to several of us.
-Rod
What method did you use to reposition the exciter ring back to where it should be? Those are typically quite fragile and knowing how to move it may prove useful to several of us.
-Rod
