how to unfreeze a Frozen brake caliper

[Smelly_Cat]

Ok RX7..  the front brake caliper pistons are froze solid.  i don't want to buy new 21 year old brake calipers.   Is there a trick to getting the pistons out.  Brake pressure did not work.  can I fill them full of engine oil.  to loosen them?  help  SC

[Ret.Bugtech]

Whats wrong with new 21 year old calipers ?   I don't think oil/nut buster will help as oil will cause the rubber goodies inside to swell up and make things worst. I have freed up a few but it wasn't worth it in the long run. If you do get it apart somehow, you will have to replace everything inside anyway so why not just bite the bullet and spring for a set of re-built one. It takes all kinds of tricks to free up these things.  Maybe someone out there may has learned  some new ways by now .  Good luck

[Smelly_Cat]

New ones are 71 bucks each.  I am going to  open a can of "Triangle" on it.    Emptied out the brake fluid and filled it with  liquid wrench.  THen hooked up brake line. the hammered in the piston with a 2x4.  then pumped the brake pedal 10 times hard..  then hammered it back in.  repeat.  after 20 minutes of this .  it came out.  Whoopee. Why am I so tired?.    Now I got to do the right side.   SC

[Ret.Bugtech]

Way to go Dude. Hope the other one is that easy.  New kits and you are on the way. There are more ways to choke horse than feeding it ice cream 

[Smelly_Cat]

Alright! got the  left one in.  lets work on right.   1st thing .. I broke the top of the bleeder screw off.  Rats..  since it is tight its not leaking. maybe i'll fix that later... removed the front piston.  It popped out easy.  not like the weasely left side.  Opened it up.. cleaned out the crud . reassembled.   Seems like they are working. I'll rebuild them later.. ya right   Now the car will roll when I push it.  SC