seized brake pistons

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Welcome to the forum. :waving: Two ways that I know of and have used. 1st is air pressure (I had the calipers off the bike) where the brake line goes into the caliper get a rubber tipped air nozzle and apply pressure. Be careful because the piston will shot out with a lot of force. The 2nd way I know is get a bolt and plug the hole where the the brake line goes into the caliper and put a grease gun on the brake bleeder fitting open the valve and pump in the grease and it will slowly push out the piston. It's a little messy but it worked for me. Good luck:action:

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I have used about 40 psi from a compressor, be careful it will shot out very fast mine flew across the room.

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First , if they are still connected to the system try and use the hydrualic pressure to pump them out. Remove them from the disc then pump and you might force them out. If they are off the bike already sometimes you can "pop" them out with compressed air , though you need good pressure . Last option is off the bike build an adapter to connect a grease gun to the brake line port . pump full of grease and blow them out that way . its measy but can move them .





sorry for old info :cheeky1:those guys are typing faster then me today .

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Welcome Codeman! Any luck yet? As mentioned forcing out with the brake system is proly the best way. However, if you already have them out..
If it becomes a problem, PM me, because I have a special grease zerk that a wonderful member here made and was kind enough to send to me when I had this problem.

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air has worked for me.. wrap the calipers in rags to prevent them flying away and getting damaged, i also used a wooden stick to stop them from poping out just wanted to free them up.

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thanks i have tried air no luck have sprayed with PB Blaster. But have not tryied grease yet but i will. thanks all.

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You hay have to replace pistons from rust.
I have just had new stainless ones made and am very happy with them. I have put the details on a thread on this forum.
Just a thought.

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so far the rear one has come out still working on front ones. but i did get her started last night for the first time in i was told 3 years so that makes me happy i may be riding her come spring.

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if it been stuck a long time the greese gun method is best. if you can get the bleeder loose take it out go to the hardware with caliper and buy a greese fitting that comes close to fitting the threads of caliper and screw it in just alittle bit dont want to mess the theads up. plug the brake line hole up with bolt and use greese gun . greese will leak out the theads a little bit but the piston will come out slowly. this worked for me on a salvage yaed caliper that had been in the outside for 20 plus yrs. cleaded everything up and workeed great joedrum

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thanks i will try to get time this weekend to get them out