[urq] Brake Judder

[Martin Pajak]

- warped discs, usually caused by overheat, disc inbalance or bent hub.
- bent hub (BTDT on my '85)  however this one gets worse to a point where
braking at 30mph can cause steering wheel shudder.

I've been fighting this one on my '85 for a while now.
I have SQ calipers and originally had SQ rotors.
Initially my problem was a bent hub.
After that was fixed, I decided to use cut down S4 rotors.

I did not have them balanced and after a while they would warp.
Iitially it just feels like wheel inbalance even those are balanced. After
a while they would warp and I would have to have them re-surfaced.
Right now they are out for balancing.. so I can't comment if it has been
solved.. however this is the last resort as everything else is brand new..
:)

Now I don't know if this applies to your Subaru..

Cheers
-- 
Martin Pajak

http://www.quattro.ca

1982 Audi Ur-quattro (50,000 mi) new project
1983 Audi Ur-quattro (85,000 mi) Concourse d'Elegance
1985 Audi Ur-quattro (212,000 km) Euro spec. import mit 3B :)
1987 Audi 4000s quattro (205,000 km) wintervagen mit 7A :)



>> Not strictly confined to Audi but I know the  readers of this list
>> have so
>> much more experience than the usual repair techs!
>>     There have been many articles written about  juddering under
>> braking, not
>> the least by Stop Tech who essentially say warped  discs are not
>> the problem.
>> I put new discs, pads, and tyres on my Subaru within  the last
>> month and
>> bedded them in in the usual manner. Brake as hard you like  from
>> 55mph and all is
>> smooth. At running speeds in the 60-80mph range there is a  slight
>> vibration
>> through the steering normally associated with wheel balancing.
>> Brake from the
>> 60-80mph range and there is a sever judder until the speed drops
>> below 55 or
>> so.
>>     Local technician, at very well respected servicing  outfit who
>> also
>> installed the tyres, drove the car and said to replace the  discs.
>>     Question?    Anyone experienced  another cause for the judder
>> such as tie
>> rod ends, steering knuckle, or simply  alignment?
>>
>>     Martin Dapot
>>
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>
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