removing brake pistons

[damz]

The brakes of my fzr are pretty much jammed shut with crap but they still work and the bike is a nightmare to bleed the system.

anyway i have another set of calipers for the bike and going to fix them up while using the bike. the best way i know of to remove pistons is to use the bikes brake system however since i have the brakes already set up what other ways can i remove the pistons?
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Current Bikes RVF400 - 94
Cars: RX7 FD, Eunos Roadster
Former Bikes: FZR 250R 89, ZX7R 98

[puremagic72]

Hi, sorry but thats the best way to get them out, i had too when i did mine a short time ago.
Since you said it has loads of crap built up on them, chances are you wont be able to blow them out with compressed air.

So bite the bullet and hook em up to the lines and pump away!!

Baz
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Make; cbr929cc blade Year; 2001
Gsxr 750 2000, alstare Corona, Current bike 1999 R6
(1) Kids in the back seat cause accidents; accidents in the back seat cause kids.

[BanditsHigh]

Shouldn't really offer since you can't ask your Scottish mates but pop over and I'll help you get the pistions out

[the grim reaper]

A tip for those without an air line. Get an old bicycle inner tube and cut the valve off, leaving a bit of rubber around the outside. Trim the rubber into a circle until it will screw into the banjo bolt hole snugly, then use either a car footpump or £9.99 bicycle pump to push the pistons out.

I use a £30 track pump and I have had it off the end of the 150PSI gauge before. Never failed with this method though, although I did once fire a KR1-S brake piston the full length of the back garden. I was glad that one wasn't pointing at the windows. Wrap the caliper in something more substantial than paper towels if you don't want to copy this mistake

Cheers

Grim
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[D O G]

That is an excellent tip grim - does it work with the high pressure valves too?

Question #2 - what happens when you have multi piston calipers and force onr out using the compressed air, leaving one still in and no ability to repressurise? Just put the cylinder back in lightly and jam it so it cannot come out, making the other one move?

I will be trying this this week I reckon.

[the grim reaper]