Parking brake 4000 quattro

[SuffolkD at aol.com]

Ben: Not sure if it is like the 200 I just did.
The rear caliper piston was sooooo far out bacause the pads were down to the 
backing plate.  But the cam lever still pushed the piston outwards when 
ratcheted out by my thumb.
After pushing the piston back in and installing pads I couldn't "thumb" 
ratchet (the cam) up the slack to engauge the piston to the pads.......... so the 
rotor got rusty from the lack or "squeeze".
The fix I found was lots of driving with HARD pedal application over 400 
miles. ( track day too :-) ) which finally pushed the piston out to meet the pads 
along the rotor.

I have no idea why.
-Scott by BOSTON

> From: "Ben Swann" <>
> Subject: Parking brake 4000 quattro
> 
> I am in process of checking/installing calipers to fix 4000 quattro rear 
> caliper that is not pushing the piston out when the lever is turned - either by 
> hand or with the cable.
> 
> I took a good caliper off a 5000 q - worked fine before taking it off.  
> After installation and bleeding, the piston doesn't push out anymore.  Now I have 
> scrounged up several of these, and they seem to have the same problem.  
> Perhaps something with removing the piston and cleaning and installing good seal 
> has  made one stop working.  
> 
> What is causing this?  how come the parking brake portion of the caliper 
> stops working, even though the lever moves freely?  Moving the lever results in 
> no or barly perceptible movement of the piston.
> 
> Can this be fixed?
> 
>