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An idea........ Posted by Herb Hirsch [Email] ![]() ![]() ![]() In Reply to: AERO Brake Issues, John D., Fri, 23 Jan 2009 19:44:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Assuming that you now have a vibration issue after replacing the front pads and rotors, here are a couple of ideas. Further, it is assumed that the new problem is being caused by the new front rotor/pads.
1. ROTOR TO HUB INTERFACE: If the wheel hub wasn't thoroughly wire-brushed and claeaned there could be a small piece of material between the hub face and the back/inside of the new rotor. This would cause it to seat imperfectly, causing a vibration.....that will not fix itself. Alternatively, the back/inside of the new rotor itself could have an imperfection that is preventing it from seating fully, causing the vibration you're experiencing.
The answer to the above scenarios is to take things apart...clean and inspect, then reassemble and test. If you find something on one side, definitely do the other.
2. WARPED ROTOR: After you've exhausted yourself on item no. 1 use a dial indicator and check for rotor runout. Maximum runout for a 2000 9-5 Aero is .08mm (Saab WIS). Occassionally, a new rotor is warped due to a manufacturing defect or subsequent handling/installation. Replacement of the defective rotor is the only answer.
Hope that the above ideas help.
Herb Hirsch
South Brunswick, NJ
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