I fought mine all Sunday and made 0 progress...I'm open to more suggestions besides compressed air.

 

if your calipers are out just put them in a vice and use some vice grips to slowly turn the piston until it comes out. Or just fork out $300+ dollars for new ones.

 

[quote name='donhayes' date='May 25 2005, 10:12 PM']if your calipers are out just put them in a vice and use some vice grips to slowly turn the piston until it comes out. Or just fork out $300+ dollars for new ones.


[/quote]



Vice grips? it will ruin the pistons, even if you get them out, you'll have to buy new one's anyway.



Air pressure should get them out without too much trouble, maybe you guys haven't blocked all the openings sufficiently.

 

or $52 each from autozone

 

[quote name='Dysfnctnl85' date='May 26 2005, 06:09 AM']I fought mine all Sunday and made 0 progress...I'm open to more suggestions besides compressed air.


[/quote]

You can put a grease nipple instead of the bleed screw and pump them full of grease,but it's messy. If they're well stuck you're probably not going to find an easier way than a footpump.



Mark

 

[quote name='inanimate_object' date='May 26 2005, 07:21 AM']You can put a grease nipple instead of the bleed screw and pump them full of grease,but it's messy. If they're well stuck you're probably not going to find an easier way than a footpump.



Mark


[/quote]



Time to pickup a footpump! That should build up sufficient pressure as long as I block the openings, and probably keep the pistons from shooting out.

 

[quote name='inanimate_object' date='May 24 2005, 07:35 AM']We used a bicycle foot pump hooked up to the brake line - I've heard of air compressors used but I wouldn't because of the danger and also calipers are not designed for the pressure. Some of the pistons will come out before the others - when they get unstuck just clamp them once they come out a bit so all the air doesn't escape.



Mark


[/quote]



Not designed for the pressure?



1. Single stage air compressors develop around 120 psi peak, dual-stage typically around 175 psi (although larger industrial units do commonly develop higher pressures... 250-300 psi is not unheard of). Now, you can lower the pressure far below that with an air line regulator... you can drop the air pressure to below 5 psi, so excessive pressure is not a worry. Air line regulators are cheap to buy, as well... $20-$50 is common pricing.



2. The hydraulic system is a high-pressure system. With the pdeal fully depressed, system pressures far exceed over 1500 psi.



So they can definitely handle a mere 120 psi.



I typically use 60 psi to force out my pistons.

 

[quote name='Dysfnctnl85' date='May 26 2005, 10:12 AM']Time to pickup a footpump! That should build up sufficient pressure as long as I block the openings, and probably keep the pistons from shooting out.


[/quote]



Even easier...

Mount the calipers back in place, with the brake pads removed, but rotor still in plcae.

Pump the brakes.

Take caliper off, grip fully extended piston with rag, and twist out.



Takes a couple minutes.



I only use air when I have the calipers already off the car.

 

[quote name='scathcart' date='May 27 2005, 03:23 AM']Not designed for the pressure?



1. Single stage air compressors develop around 120 psi peak, dual-stage typically around 175 psi (although larger industrial units do commonly develop higher pressures... 250-300 psi is not unheard of). Now, you can lower the pressure far below that with an air line regulator... you can drop the air pressure to below 5 psi, so excessive pressure is not a worry. Air line regulators are cheap to buy, as well... $20-$50 is common pricing.



2. The hydraulic system is a high-pressure system. With the pdeal fully depressed, system pressures far exceed over 1500 psi.



So they can definitely handle a mere 120 psi.



I typically use 60 psi to force out my pistons.


[/quote]

Ok if you say so! I was going on the basis that if a foot can provide enough pressure for un-servoed brakes then a foot pump would be better suited. Better safe than sorry and all that.



Mark

 

my fav is a hammer and a block of wood