[s-cars] Rear brake caliper sticking

[Peter Schulz]

Rich:

Based on my experience, the root cause is the ebrake mechanism on the caliper.
You indicated that you lubricated the cam, but do you in fact have full and 
complete travel? - remove the spring external to the cam and check.

On a new caliper or correctly rebuilt one, the spring under the caliper 
piston provides enough pressure to move the ebrake cam back and forth 
without the additional spring external to the caliper.

-Peter

http://www.20v.org/brakere.htm








At 09:15 AM 12/14/2005, Rich Assarabowski wrote:
>   I'm having trouble with one of the rear brake calipers sticking, it
>works fine when cold, after a couple of hard stops it doesn't release all the
>way.  Once it cools down completely it's OK again.  It's already been
>replaced once a couple of years ago with a rebuild.  I lubricate the hand 
>brake
>cam regularly, in fact it was lubed just a couple of months ago when new
>hand brake cables were installed.  So my suspicion is that it's the piston
>sticking.
>
>I guess it's time to put in another rebuilt caliper, anyone have a
>source for high quality rebuilds?  My feeling is most places just clean up
>calipers and pop in a new piston seal, without rehoning the cylinders, 
>measuring
>for tolerances, etc.   I don't want to keep doing this over and over...
>Or bite the bullet and put in a new one?
>
>-- Rich A.
>    '92 & '93 S4
>
>
>
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1991 200 20v Q Avant Titan Grey
1991 200 20v Q Avant Indigo Mica
1991 90 20v Q Red
1990 CQ silver (awaiting S2 engine transplant)

1990 CQ red ( to part or not)
Chelmsford Ma, USA