I'd try compressed air first, just in case that works. It easier to clean up
than getting the grease out ;) I have read that the grease method can move
caliper pistons that compressed air can't shift.
Be careful though. If the air works, its a big bang and the piston may come
out at speed. Put a blanket over the caliper, or some other precaution, like
a C-clamp.
I have also read of people using the car's hydraulic system to achieve the
same effect - remove the caliper from the rotor but leave the hydraulic line
attached, hang it from the suspension by a piece of coat hanger, and press
the pedal.
Another thought: when I was stuck with a stuck piston, I saw a couple of
suggestions / solutions online.
- Use a plumbers test plug of appropriate diameter (expands inside the
caliper, providing a point of leverage).
- Use a pair of pliers made for this job. I could only find Japanese ones
($$$). These were similar to the pliers I've seen at HF for spreading
Battery cable end-terminals, but bigger: Squeezing the handles together
pushes the business end apart, gripping the piston's inner walls so you
can agitate it out of its hole.
Brian
On Wed, Nov 11, 2009 at 10:55 AM, <GHaynesTR4@aol.com> wrote:
> A guaranteed method of removing stuck pistons from calipers goes like this:
>
> Braze a grease nipple into an old brake line fitting. Screw the fitting
> into the caliper and apply grease with a gun. Grease cannot be compressed
> and the piston(s) will come creeping out. Secure the first out with a
> clamp
> or block of wood until the second emerges. Messy but very effective.
>
> George
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