War Prayer

Hey all,

with the nicer weather moving in I’ve been driving with the windows down more and I noticed that my drivers side front brakes have sort of a rhythmic scraping sound when OFF the pedal. If I give it moderate application of the brakes the frequency of the scrape speeds up, and if I give it firm brake pressure the sound goes away entirely. Looking at the pad and rotor there’s not an issue that I can see. The pistons don’t seem to be stuck either, and the guide bolts are properly lubricated.

Power stop pads/rotors with about 6k miles all around. Any thoughts?

B52bombardier1

I bet you would see noticeable runout wobble on at least one rotor if they got put on a lathe for a measurement.

Rick

FirstYrLS1Z

iTrader: (4)

^^^ that OR clean the contact surfaces, inside the rotor and hub surface, where they sit against each other.

War Prayer

Thanks for the replies. I figure any auto parts store ought to be able to turn the rotor down for me or at least check the runout. While it's off I'll take a grinder to the hub surface.

FirstYrLS1Z

iTrader: (4)

NO, not a grinder, that could/would make it worse. Just clean to remove any accumulated dirt/debris/rust.
The hub has to remain 'true'.

War Prayer

so what I was picturing is a “hub buddy” that attaches to a 1/2” impact, looks like this:

FirstYrLS1Z

iTrader: (4)

Yep, that would do. Even a 'handled' wire brush would do on the hub, a 'scotchbrite' pad in the rotor. Not trying to remove any of the 'natural' metal.
Even after that, the rotor might need 'trueing/turning.'.
If the 'bad area/spot' was caused by an 'overheat' hard braking condition, it'll create what everyone refers to as a 'warped' rotor. That creates a 'pulsing' feel in the pedal when applying the brakes.

sjsingle1

iTrader: (1)

I would check the pins.....for some reason the grease goes to crap and they seize up.....pin regrease is a must maintenance item