Other Stuff > Tricks & Tips
Freeing stuck brake pistons with basic tools and no mess!
Bryanj:
In a situation like that i would not remove the caliper from the hose but only from the fork, remove pads and put a flat tyre lever in the middle then pump out the pistons with the lever
K2-K6:
Some good alternative methods there.
I'm similar in trying to first pump them out with mastercylinder pressure if possible.
In MTB brakes they have more currently moved to "bleed blocks" that are more or less as described with a tyre lever or similar to put between the piston to lever them out by holding some in.
More specifically they are used in place of pads for bleeding the caliper when off installation to then leave a bled system with space to fit a new set of pads during installation. Usually they're just plastic blocks and maybe supplied with a new caliper to facilitate this and being of correct shape to fit.
People are 3D printing them though with say one piston space deleted so that you can focus on one stuck piston individually, while any others are held bake in their bore.
I'm up into the hundreds of these in freeing them up ftom corrosion around that piston seal (they ate similar to our Honda arrangement for that aspect) so many not maintained or excessively jet washed to their detriment.
AshimotoK0:
Looks like a great idea .. I will have to try it.
On the CB250RS I have just got, it came with a spare caliper but somebody had drilled and tapped the alloy housing to force the piston out and then fitted a short allen screw in order to seal up again (no sealing washer fitted :( either) . Ugly looking bodge though IMHO. I have drilled and tapped the piston before, when I knew the piston was knackered (as they usually are). I have never tried the grease gun method but piped up to a master cylinder and used the hydraulic pressure to remove the piston. This is what I did on the seized but unmolested CB250RS caliper that was fitted to the bike.
Johnny4428:
Liked this video, mainly because it’s what we do the whole time without realising, improvisation. We use what we have at hand. Surprised he didn’t look for a small bit of pipe or the wrong end of a shifter for extra leverage on that key.
Laverda Dave:
--- Quote from: AshimotoK0 on January 31, 2024, 11:15:39 PM ---Looks like a great idea .. I will have to try it.
On the CB250RS I have just got, it came with a spare caliper but somebody had drilled and tapped the alloy housing to force the piston out and then fitted a short allen screw in order to seal up again (no sealing washer fitted :( either) . Ugly looking bodge though IMHO. I have drilled and tapped the piston before, when I knew the piston was knackered (as they usually are). I have never tried the grease gun method but piped up to a master cylinder and used the hydraulic pressure to remove the piston. This is what I did on the seized but unmolested CB250RS caliper that was fitted to the bike.
--- End quote ---
I think this was only bike that used this caliper Ash.
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