Hi,

 

Any suggestions how I can free up a siezed calliper piston? I've pumped air into it but it still won't budge :(

 

Cheers

 

Vijay

A small G clamp will do the trick,use a small piece of wood etc between the clamp and the caliper so you don't mark it;)

Originally posted by MAC 1

A small G clamp will do the trick....

 

I think he meant to say:

 

A PaulG clamp will do the trick.... :D

Cheers but I'm trying to remove them:( The piston is stuck right in.......................

 

Vijay

Clamp the free ones, and use the brake pedal to push them out ;)

Hi Andy,

 

They're not on the car, so can't use the brakes. I've clamped the 3 others and pumped over 150 psi into the calliper and it still wouldn't budge :mad: Any other ideas?

 

Cheers

 

Vijay

I also found that even 150psi wouldnt shift them.

 

When I did mine I had to put them back on the car with old pads in the sides that did work and a piece of wood against the single free piston other side then stamp rally hard on the brake pedal. You hydraulic them out - really messy as you loose the brake fluid each time one pops. I had 1 really tight on each side. Clean each up and do the seals and pop it back in to do the last one same way other side. Or as you feel it begin to give way under the brake pedal check which one has moved and block it to let the other go. Saves the mess X2.

 

hope that makes sense

 

I tried g clamping with a small g clamp on the free side but the clamp broke with the pressure.

 

You can actually push the pistons back in with your fingers when they are really clean.

can't get them on a car as they're my old ones that I'm cleaning to sell.

 

Vijay

Originally posted by vijay

can't get them on a car as they're my old ones that I'm cleaning to sell.

 

Vijay

 

The problem you have is the difference between hydraulic and pneumatic. Air will squash as it fills a space under pressure, rather than moving the piston. Whereas the fluid is much more solid and as soon as it has filled the gap, puts the energy into moving the piston (rather than compressing).

 

One option is to fit them back on the car to get them out - shouldn't take too long but you will have to re-bleed the front brakes.

 

Have you tried removing the rubber seals and soaking the calipers in penetrating oil? You will need to replace all the rubbers if you do this but I'd recommend that anyway if your pistons have been seized.

 

HTH

 

CheerZ,

 

Andy

Cheers Andy. I'll give it a soaking in oil as I'm gonna change the seals anyway.

 

Vijay

Mebbe a touch of heat?

 

eg with electric paint stripper rather than flame.