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I have some used brake caliper's to refurb and i want to remove the pistons to check for wear and replace the seals.
I have no compressed air to use and i wont be pumping grease into them either!
As a last result i could connect them to the car and push them out with pedal pressure,
but any other options/ideas before i go through that kerfuffle?!
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'76' Datsun 260z 2+2 UK RHD.... owned since '95' none of that rust free LHD import shenanigans!
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why not grease? safest option, second to using the master cylinder.
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I made an adapter which I could connect to a foot pump, block of wood in the pad gap, stand on pump.
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74 Mk1 Escort 1360, 1971 Vauxhall Victor SL2000 Estate.
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Don't over think it just pump them out with the mc and stick something under them to catch the fluid .
ps if doing this just do one side at a time.
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I made an adapter which I could connect to a foot pump, block of wood in the pad gap, stand on pump. You can use a tyre valve as an adaptor. |
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I've never liked the idea of using compressed air as you can't be gentle. When it goes - it goes big time!
My choice is fit the calipers on the car, loosen 1 caliper but keep the hydraulic lines connected, use the pedal to free the piston. Mop up the spilt fluid.
Clean everything, replace seals, refit the caliper, bleed the fluid.
Repeat for the other side.
Or find a way to pressurise fluid/grease when the caliper is on the bench (use a spare master cylinder?)
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Danny
Part of things
On your screen
Posts: 837 
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I just carefully levered mine out bit by bit side by side,checked, cleaned and replaced the seals that i got from BIGRED on ebay.
Job done
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I had a siezed piston in a set of princess four pots, after exhausting all other options I just welded a bar to the piston a flogged it out...
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why not grease? safest option, second to using the master cylinder. Because on a modern single piston sliding caliper its fairly easy to remove all the grease from the innards afterwards, not so with 2 or 4 pot etc, how can you be sure its all out of the fluid galleries! I've read its a complete Barstuid to clean up properly, if at all and could even prove dangerous, so nah  |
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Last Edit: Jun 6, 2017 19:37:00 GMT by ant260z
'76' Datsun 260z 2+2 UK RHD.... owned since '95' none of that rust free LHD import shenanigans!
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very easy, degreaser and air  |
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I just carefully levered mine out bit by bit side by side,checked, cleaned and replaced the seals that i got from BIGRED on ebay. Job done Lol, yeh i may resort to doing just that, with 4 pot calipers tho it will be a tedious job! |
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'76' Datsun 260z 2+2 UK RHD.... owned since '95' none of that rust free LHD import shenanigans!
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Danny
Part of things
On your screen
Posts: 837
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I just carefully levered mine out bit by bit side by side,checked, cleaned and replaced the seals that i got from BIGRED on ebay. Job done Lol, yeh i may resort to doing just that, with 4 pot calipers tho it will be a tedious job! You might be surprised how easy it is to do i've done it many times without any damage or alternatively rig up an old master cylinder in the vice so you can use hydraulic pressure to push them out |
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fad
Posted a lot
Posts: 1,781
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Forgive my ignorance, once one piston comes out under hydraulic pressure would the others not stop moving and all the fluid just gush out of the one that popped out?
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indeed, just like it would with Air.
difference with air is that it compresses a fuckload, hence why you don't want it in your brake lines, however when you release the pressure it expands, DAMN fast, propelling anything loose in its path, in this case the piston.
that's why pressure vessels are hydraulically tested, not filled with air...
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Last Edit: Jun 7, 2017 9:08:05 GMT by welshpug
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Just a thought, have you looked at how much someone like Biggred wants for refurbed calipers?
A mate found that on his LR110 it was about £30 each, not worth the hassle/cost of replacing seals, let alone finding that the pistons were fubared anyway
i've always used grease, with no adverse effects, calipers, slaves, masters, the whole nine yards
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MiataMark
Club Retro Rides Member
Posts: 2,963
Club RR Member Number: 29
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As above check the price of refurbed disks, other than that I've used a foot pump (and for one piston some tapping with a punch behind the dust shield). I used the adapter meant for air-beds etc and a bit of medical glove with pin-hole to create a seal. Even if the pistons do come out with a bang they're not going to go far, just keep your fingers out of the way.
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1990 Mazda MX-52012 BMW 118i (170bhp) - white appliance 2011 Land Rover Freelander 2 TD4 2003 Land Rover Discovery II TD52007 Alfa Romeo 159 Sportwagon JTDm
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