Bedding in plated rotors
11-18-2007, 10:08 AM
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Bedding in plated rotors
<center><img src="http://pictureposter.audiworld.com/69246/rotor1.jpg"></center><p>Hi guys,
Just installed 4 new plated standard rotors (no grooves, no crossdrilling) with PBR ceramic pads. Bedded the pads in per the instructions (several 40-0 stops, then let it cool). The pedal still feels firm, but the brakes don't grab as well as I think they should. It isn't as good as it was with the roached out old pads and rotors.
There's also a slight grinding sound coming from the brakes.
Is this just the plating coming off the rotor faces or is something else amiss? Will this clean itself or should I take it all apart again and clean it up? I'm guessing the pads will get better with some use, but I'm concerned that the plating might be contaminating them. Thoughts?
Photo above is of driver's side rotor after bedding-in.
Just installed 4 new plated standard rotors (no grooves, no crossdrilling) with PBR ceramic pads. Bedded the pads in per the instructions (several 40-0 stops, then let it cool). The pedal still feels firm, but the brakes don't grab as well as I think they should. It isn't as good as it was with the roached out old pads and rotors.
There's also a slight grinding sound coming from the brakes.
Is this just the plating coming off the rotor faces or is something else amiss? Will this clean itself or should I take it all apart again and clean it up? I'm guessing the pads will get better with some use, but I'm concerned that the plating might be contaminating them. Thoughts?
Photo above is of driver's side rotor after bedding-in.
11-18-2007, 10:44 AM
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Looks like bedding compound coming off pads......
Clean with brake cleaner (get the killer non-PC stuff). Verify NO METAL FLAKING occurs. Noise is likely to be due to different/better (we hope) compound. My Axxis PBRs are pretty noisy at low speeds.
11-18-2007, 04:28 PM
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installed wrong .... its not 100% straight inside the caliper, remove ...
pads again and inspect for damage. Something similar happened to me a while ago with a rear pad. It was not 100% straight in there and under the first pressure it bent the metal part of the pad breaking to a point where it broke off the compound ... sorry but looks like you gonna need new rotors and pads.
11-18-2007, 06:01 PM
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Re: installed wrong .... its not 100% straight inside the caliper, remove ...
Fortunately (?), all 4 corners look like that. Maybe one pad somehow got installed incorrectly...MAYBE. But not all 8 pads. The rotor merely looks like it has grooves in it, but the surface is smooth--it's just the plating scraping off on the pads. My worry was contamination. I did a few 80 MPH stops later in the day and it seemed to help bed the pads. More time and I'm sure it'll get better.
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11-19-2007, 03:42 AM
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as I said I had something similar happen to me on one pad ....
and it was accompanied by a slight grinding noise and visual damage/scraping on the rotor which looks very similar to the pic posted. Luckily I realized it after the first "lets test the brakes" in the parking lot so all I had to do was get some new pads.
11-19-2007, 12:41 PM
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Did you wash the rotors prior to installing?
You need to do a more aggressive bedding job.
I say about 6 ea. 60-10mph and never come to a stop. Maybe a 7th one at 80-10mph and hopefully you are smelling some stinking pads. That is OK. Now drive, without coming to a stop anywhere for 20-30 minutes at freeway speeds to cool everything down. Go home, park, DO NOT set the hand brake. Brakes will feel great the next day.
I say about 6 ea. 60-10mph and never come to a stop. Maybe a 7th one at 80-10mph and hopefully you are smelling some stinking pads. That is OK. Now drive, without coming to a stop anywhere for 20-30 minutes at freeway speeds to cool everything down. Go home, park, DO NOT set the hand brake. Brakes will feel great the next day.