chenishead

I hooked up the air compressor and I used pressure in increments of 20. Got to 120 and the pistons did not even move. Now what? Maybe a source for rebuilds?

Thanks for the help and responses.

alextimmons

Have you taken the pressure bleeder off the reservoir? ;-)

chenishead

Yes, fixed it too. A sledge hammer can be pretty convincing

NeilTheWheel@82atwrk

should be able to center up the piston, take care in not damaging the seal,clean it up and use lots of brake fluid to get it back in.If ya can a service kit, replace everything.when the piston is sent all the way in replce or reinstall the boot CAREFULY.make sure the boot is tucked in its seat around the piston. You can do it.

Just think you'll have remained calipers now!

sha weet



how does the piston retract when brakes are released ?

RGC

it doesn't it just stops pressing against the disk when the pressure is released.

silverd2

That's just part of it, but not enough.

The spring that holds the pads in place also spreads them slightly...it has to be designed that way. Just a fraction of a mm is enough...without it, the unaided dragging would lead to overheating and/or squealing very quickly. Brake pad-to-caliper sliding surfaces that have never been cleaned or lubed lead to exactly that.

The spreader spring is a part of every version disc brake I've ever seen.

RGC

The Lucas calipers do not have any springs.