[T3] Stuck wheel cylnders

Jim Adney jadney at vwtype3.org
Thu Sep 13 21:28:30 PDT 2012


On 13 Sep 2012 at 20:30, Dennis Stiefel wrote:

> We started to rebuild the wheel cylinders and the first one we worked on was
> locked up tight.  We tried putting compressed air to but no budging. I'm
> letting it soak in diesel fuel overnight but does anybody have any other
> suggestion?    

Petroleum products will ruin all rubber parts so you're now commited 
to using all the rebuild parts.

100 psi compressed air just won't develop enough force on those small 
pistons, but the hydraulic system can produce 10x-20x that amount of 
pressure.

If you can free up the bleed valve, you can put this back on the car, 
bleed the system, and use the hydraulic pedal pressure to push them 
apart. I generally advise rebuilding these ON the car, just because 
it's easier and there are several things you won't damage if you do 
it this way. I seldom need new parts if I do it this way: just hone, 
clean, and reassemble.

You will probably have to do one at a time, reassemble everything on 
that side and then pump out the other side. Or use a C-clamp to hold 
the finished cylinder together while you push apart the other side.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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