I just replaced both front rotors and pads due to wear, now I have a problem at low speed with the brake pedal vibrating and eventually I get the ABS and brake light on the dash. I have torqued the spindle nuts to 290 ft/lbs from the info I got here on the forum. Anybody have any suggestions as to what is going on? I did not have this problem prior to performing this maintenance.

 

What year is the truck? If you have the ABS reluctors in the rotors, the new rotors may not have come with them. Every time you stop, the abs module thinks you are sliding and it's applying ABS.

If that's all normal, then I'd say to check the abs sensors and connectors.

 

2005 ford F150 Supercrew, there were no other parts in the rotor kit

 

the reluctor rings were part of the rotors

 

The new rotors have them though? Not all trucks had ABS as an option, so not all rotors have the rings. Parts guy might have given wrong ones out.

If the rotors have them, also check them for any cracks or inconsistancy in the teeth. Even a hairline crack in the ring will be enough to cause an erratic reading and a false activation.

Check out these things and post back your results.

Number one rule is that if it worked before and it doesn't work after you touched it, it's probably something you did

 

Well, I found the problem, the reluctor rings on the rotors are not installed true.The rotors are true, but the reluctor rings are installed crooked causing the abs to lose signal. Gonna go back to the parts house and get a refund, and see what they are going to do about refunding me the cost of the spindle nuts that are a one time use.Wish me luck.

 

The good news at least is you found the problem. Good luck with the refunds

 

update on the rotors, not only were the exiciter rings on crooked, one was pressed on the rotor too far for it to activate the ABS pickup, in fact BOTH rotors were bad. I got another set from another parts house and had the manager mic the rings to make sure they were true and mounted the right distance from the ABS pickup. Quality control in the parts industry has absolutely gone to the dogs in the past few years. Next time I'll know to check them.

 

It might cost more, but that is one of the reasons I get most of my parts from the dealer. Quality for the parts is 99% of the time spot on. Glad you got it all straightened out though.

Also, the code for the front sensors will still be stored in the module, but after a little driving and the module sees the inputs for the front wheels, the light should turn off if it hasn't already.

 

problem has been solved with the different rotors, what a fiasco

 

I just had the same issue, but just the ABS light (not the brake light). Has your issue been resolved? I was wondering if the surface finish on the rotor may be keeping the ABS sensor from working. My aftermarket rotors came with a black finish that protects the rotors from rust until the the pads are applied. Is there a way I can remove that finish from the reluctor rings without removing the rotors and locknut?

 

the problem was with the excitor rings being installed not true to the rotor, with one the rings being installed too far away from the pickup sensor. The black finish should have no affect on the abs sensors.

 

I was afraid of that... Thanks for the reply. I bought them online, so I'll call them up the end of this week and see what the return procedure is. Your's weren't EBC dempled slotted rotors by any chance were they?

 

No,the rotors were from Oreilly.......first time for bad parts from them.

 

The exciter rings should be almost flush with the hub on the rotor (inboard side). If you ask the manager of the parts store for the specs, they should be able to give them to you. Haveing said then ask them to use a micrometer to check the questionable rotors. I had no problem getting a refund onece I pointed out the problem.