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Suspension & Braking Forum by BimmerWorld
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Old 11-08-2012, 10:09 PM   #1
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Join Date: Jan 2007
Location: St. Louis, Missouri US
Posts: 303
My Ride: 325i Sport Package 0
Rotor Resurfacing and Pads Question

When braking I am experiencing a "fast/slow fast/slow" type of deceleration when applying the brakes. The best way I can describe it is that during braking there is lots of friction then less friction then lots of friction then less friction, over and over with an al together jerky feeling stopping.

I just put on new drilled rotors in April 2012 along with some EBC Yellow Stuff 4000 high friction pads.

I have put 20K on them since April.

I am well aware of what ABS feels like and this is totally different.

The pedal does not "pump" as it has on other warped rotors like it has in the past on other cars so I am hesitant to think the rotors are warped. There are no large visible grooves or a lip on the rotor. The pads are at 80-90%.

The calipers were rebuilt at the time and new SS lines were added.

The parts store said that a new rotor thickness should read .806 on a micrometer and anything less than .803 they would not touch as far as resurfacing. I was getting a solid .807 reading all over on various pars of the rotor which measures thicker than "spec". ??

The parts store kid also said that I would need to replace the pads IF I resurfaced the rotors. I have never heard this before but I am aware that the rotors and pad make a bond together and match each others micro grooves which helps braking.

Question: Do you think what I am feeling is just buildup? These are the most dusty pads I have ever had even more so that OE semi metallics. I have used wax on my rims, tire shine and go to spray down style washes at least twice a month.

Question: If I resurfaced the rotors would I ruin my old pads or newly resurfaced rotors by not changing my pads?

Question: I realize that bad bushings and ball joints effect braking performance but would that cause what I am experiencing?

Question: what do you recommend?

Thanks in advance!

"Brakes Stop The Wheels, Tires Stop The Car"
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