UUC BBK - Uneven Pad Wear

[markseven]

Rattle can red or no deal, hombre.

[firemanory]

Glad you like the idea Do you want me to paint the calipers, or leave them unfinished?

[markseven]

Even better than feeling the tires/wheels/rotors for temp differences you could get an infrared temp sensor to do spot temp checks on both sides to get a quantitative number for temps. I believe the Freight train sells one for pretty cheap. Hope you find a fix for it. If not, you should probably give me the BBK so you don't have to deal with that uneven pad wear again. I'll even come over and install my Oem brakes and bleed them for you. I bet you never get offers like this!!

Great idea. Will do.

[firemanory]

Even better than feeling the tires/wheels/rotors for temp differences you could get an infrared temp sensor to do spot temp checks on both sides to get a quantitative number for temps. I believe the Freight train sells one for pretty cheap. Hope you find a fix for it. If not, you should probably give me the BBK so you don't have to deal with that uneven pad wear again. I'll even come over and install my Oem brakes and bleed them for you. I bet you never get offers like this!!

[Wh33lhop]

No worries--hopefully the bearing was the issue.

[markseven]

Essentially, yes. Runout indicates excessive wear to the point where the inner and outer race's axes do not align.

Thanks mang.

[Wh33lhop]

By "runout" do you mean lateral movement? If so, then yes, there was enough walk to allow a clip-on wheel weight to tap the strut on full-lock turns.

Essentially, yes. Runout indicates excessive wear to the point where the inner and outer race's axes do not align.

[markseven]

So I am thinking the wheel bearing is/was the culprit... I will report back in a few weeks with confirmation.

[markseven]

My guess is your ABS pump isn't letting your pads return fully on the passenger side. I had the same thing but on both of the fronts and it was resolved by deleting the pump entirely. I think the pump can freak out when it's still flowing fluid but not plugged in. This would explain the breaks not pulling under load but would explain the uneven wear as the pads are most likely dragging on that side. Drive gently for a few miles with minimal braking and feel your wheels, if the side with more wear feels warmer then the other side you've found your issue.

Cool, will do.

[markseven]

By "runout" do you mean lateral movement? If so, then yes, there was enough walk to allow a clip-on wheel weight to tap the strut on full-lock turns.

[Fidhle007]

My guess is your ABS pump isn't letting your pads return fully on the passenger side. I had the same thing but on both of the fronts and it was resolved by deleting the pump entirely. I think the pump can freak out when it's still flowing fluid but not plugged in. This would explain the breaks not pulling under load but would explain the uneven wear as the pads are most likely dragging on that side. Drive gently for a few miles with minimal braking and feel your wheels, if the side with more wear feels warmer then the other side you've found your issue.

[Wh33lhop]

Worth a shot. What to do if the pass side is flowing more fluid that the driver side?

I thought this was would have little impact on the issue at hand, but in the interest of full disclosure: The passenger side front wheel bearing was bad - I had it replaced a few days ago. Could a bad wheel bearing affect pad wear? could the increased friction necessitate a "harder working" caliper?

If the bearing was bad enough that you had significant runout, then yes--the brake could be dragging yet operating normally otherwise, explaining the lack of a pull to one side under normal braking. However this would likely be reflected by a nonuniform wear pattern on the pads in question.

[markseven]

Thanks for the advice, guys.

Why isn't the car pulling to the passenger side????

[Brandon12V]

If the pass side is flowing more, then you may have a restriction on your driver's side line somewhere..... That, or maybe the restriction is somewhere on the passenger side and a venturi effect is being created. I'm not sure if that's even possible, but I would contact UUC if the devil is in the fluid. I cannot comment on your other question as I do not know.

[markseven]

grab an extra guy and bleed both front brakes in separate jars. see if both are getting the same amount of fluid by the same number of pedal pumps. i would attempt this three separate times and see if the average amount is consistent, and even, between the two. just a thought. it would at least rule out the amount of fluid being bias between the two fronts.

Worth a shot. What to do if the pass side is flowing more fluid that the driver side?

I thought this was would have little impact on the issue at hand, but in the interest of full disclosure: The passenger side front wheel bearing was bad - I had it replaced a few days ago. Could a bad wheel bearing affect pad wear? could the increased friction necessitate a "harder working" caliper?