Brake Shudder
04-29-2006, 05:36 AM
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Brake Shudder
Some months ago I changed the front rotors and pads on my car. At the time I was shocked to see that the wheel hub mounting surface was rusted and pitted. I would have thought that this surface would either be plated or protected from rust with a compound. Nonetheless, I used a wire wheel on the grinder to clean off all the rust.
I slipped the new Audi stock rotors on and the new pads, Mintex Redbox -- see my post below, and took the car for a test drive. I did several of the "bedding" stops as many have suggested. I also noticed some shuddering at medium pedal pressure.
Long story short the shuddering never when away, rather it seems as bad as ever and particularly bad during medium to hard stops from 60-30mph. I tried removing the rotors, recleaning the hubs, and remounting, but no help.
I susspect that the real problem is the hub surface rust and pitting. This "hat" brake design seems particularly poor to me. The rotors on our cars aren't fastened to the hub, so machining the rotors on the vehicle is out of the question.
The only solution that I see is to replace the hubs, which also will require replaceing the wheel bearings as they fall apart on removal. Then, of course, new rotors and pads. The $$$ are adding up here.
I had three mechanics look at this so far. Two said it's not that bad, but they didn't take it on the hiway for a ride. The other said it needs fixing but could only suggest changing all the parts.
On top of this the shuddering is causing the front susspension to wear and loosen up. New tie rod ends? ...
I slipped the new Audi stock rotors on and the new pads, Mintex Redbox -- see my post below, and took the car for a test drive. I did several of the "bedding" stops as many have suggested. I also noticed some shuddering at medium pedal pressure.
Long story short the shuddering never when away, rather it seems as bad as ever and particularly bad during medium to hard stops from 60-30mph. I tried removing the rotors, recleaning the hubs, and remounting, but no help.
I susspect that the real problem is the hub surface rust and pitting. This "hat" brake design seems particularly poor to me. The rotors on our cars aren't fastened to the hub, so machining the rotors on the vehicle is out of the question.
The only solution that I see is to replace the hubs, which also will require replaceing the wheel bearings as they fall apart on removal. Then, of course, new rotors and pads. The $$$ are adding up here.
I had three mechanics look at this so far. Two said it's not that bad, but they didn't take it on the hiway for a ride. The other said it needs fixing but could only suggest changing all the parts.
On top of this the shuddering is causing the front susspension to wear and loosen up. New tie rod ends? ...
04-29-2006, 08:03 AM
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I've concluded it's the pads...
Previous brake job included OEM rotors and pads - worked great but I was sick of all the pad dust on the rims. I switched to new OEM rotors and Red Box pads ~2 months ago and I have had high-speed shudder ever since. Specifically, I have major shudder when braking from 60-80mph. At least the wheels are clean. I'll be switching back to OEM pads when I have the time.
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