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Stuck brake piston in calliper - how to remove

I always use the master cylinder to pump them out,as said above,but would add that if you have a multi piston caliper,I always use a block of wood,
or something to block full travel of the caliper piston.
If you don't,one piston will pop all the way out,and leave the other one still stuck in the bore.
Usually,when they are close to the end of the caliper,it's very easy to go ahead and pull them out the rest of the way,no need to blow them all the way out,and less mess,too.
 
I tried the following - but it is yet to shift them:

Heated up pistons in the callipers with a blowtorch
Retried the foot pump method to almost 80 - 90lb's according to footpump.

I am trying not to use a garage but it seems I will have to
use one of a garage air lines.

I will also try and get some more brake lines (old ones perished) to use the
mater cylinder in situ method.

Will advise
 
Air line attached to bleed nipple?
Bleed nipple opened (backed off) enough that air is getting through to fluid chamber?

Other then that I am out of ideas.
 
Use penetrating oil and not WD
Use an o-ring between the air and port.
As Chuck said use heat but I would boil some PJ1 Blaster in there too. WD does not penetrate.
 
I do shoot them with some PB Blaster first and try the air like you said Bill. But then the heats the last stand and youll see the oil start to bubble a little.

And to the guys that use the master cylinder to pump it out. Yup..works a champ for single pot front calipers. But with twin pot fronts or the rear stockers which have two pots, when whichever one comes out first your done with the other still stuck. This when you will need the air / oil /grease guns trick in the tool bag.
 
chuck hahn said:
I do shoot them with some PB Blaster first and try the air like you said Bill. But then the heats the last stand and youll see the oil start to bubble a little.

And to the guys that use the master cylinder to pump it out. Yup..works a champ for single pot front calipers. But with twin pot fronts or the rear stockers which have two pots, when whichever one comes out first your done with the other still stuck. This when you will need the air / oil /grease guns trick in the tool bag.
Click to expand...
Chuck,

On twin pot calipers I use two small C-clamps I clamp one down to hold the piston in and use one clamp a little loose to free that one up. Once one moves out you can loosen the other clamp to get that one to break loose as well. Usually once they begin to move it's a simple process to twist them out. It's worked for me.
 
chuck hahn said:
I do shoot them with some PB Blaster first and try the air like you said Bill. But then the heats the last stand and youll see the oil start to bubble a little.

And to the guys that use the master cylinder to pump it out. Yup..works a champ for single pot front calipers. But with twin pot fronts or the rear stockers which have two pots, when whichever one comes out first your done with the other still stuck. This when you will need the air / oil /grease guns trick in the tool bag.
Click to expand...


That's why I stated in post 21 to use a block of wood to keep them from popping all the way out.
JTGS850L using the c-clamps works well also.
 
Many thanks for info - all good advice.
I was and only have used WD40. Thats probably why in my life I use a impact driver so much.

PB - of course is only in the USA.

i will try "plus gas" as internet say this can work ?
 
3-1 penetrating oil in a spray can works well. Or make your own from ATF and cellulose thinners (if you've got them in the garage).
 
Calipers pistons unstuck and thanks for info all !

I had to use the grease method in the end.
This sounded mad to start with but it works ! I have a cheap ?13 lever grease gun (off ebay) and the nozzle fits
over the bleed nipple fine. I blocked off other air ways with bolts and stuffing a bit of inner tube in holes before hand.
I squirted grease in (blead nipple) and out came one side (prevented from coming all the way out with a piece of wood)
To get the other side out (they are twin piston calipers) i cut a bit of inner tube and covered the central hole
when the calipers are split , did them back up and pumped again. The other side then came out.

I did the same to the other caliper and I now have them in bits ready for renovation.
both pistons need renewing obviously.

I went through using wd40 - but ended up buying proper penetrating fluid !
A foot pump and bicycle pump, could not do it either they were well seized.
I didnt try a air line as dont have access to one.

i didnt realise that a grease gun goes up to 4-6000 psi !

thanks for help.
 
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