Jump to content


Brake caplier piston stuck


Recommended Posts

I'm rebuilding '91 Toyota 4x4 brake caliper.

I could've remove 3 pistons, but last one cannot removed.

I could've pushed in a little bit using clamp. Pouring PB Blaster, apply heat gun for long time before push air from my 60Gal air compressor.

The piston won't move at all.


Does anyone have tips to remove piston?





Edited by tamo3
Link to comment
Share on other sites

I agree 100% with Willoughby. Safety first. The piston can turn into a projectile like you wouldnt beleive is possible.

I would put the caliper back together, fill it with fluid and fit a tube with grease nipple and push it out with a grease gun. Use a block of wood between the two good pistons and a clamp on the other good piston opposite the seized piston.

If the clamp wont hold, you can use a piece of pipe (same length as piston) which will fit over the piston and a thick metal plate to stop the other piston entering the pipe. The free piston will push it over the seized piston and stop. That will give you enough room to push the poston into the pipe.

There is a mix of ATM fluid & Acetone that does wonders for freeing up stuff. Give that a chance to soak in.



Link to comment
Share on other sites

Thank Chuck.

I put it back on the car and pump the brake pedal.

It seems something wrong with my booster or BMC or PB.... Brake fluid does not come out well.

Since Brake booster and BMC are rebuild. I forgot to check the length of the the push rod of brake booster.


Also, BMC is from '79 280zx 15/16 BMC. I got rebuild kit @ BrackDragon for '84 BMC. I just used piston of the repair kit. since it looks same. But once I push it in,it was so tight.


Too many variable need to narrow down the issue....

I will try the grease gun solution.


Link to comment
Share on other sites

I tried one of those piston kits on my 7/8" MC and had similar problems. The piston cups were a little different so I couldnt use them on the original piston in my original MC. Ended up buying a new Beck/arnley from RockAuto. Being brakes I just didnt trust it anymore.

For the caliper I have used an old brake line and I brassed an old uni-joint grease nipple in the other end of the brake line. I filled the caliper up with engine oil. I was replacing all the rubber components anyway. You need to get all the air out, otherwise you will be compressing air and using a lot of grease.

After you get if out you can clean the oil and grease out.


Link to comment
Share on other sites

Thanks Chas.

Over the weekend, I rebuild BMC and swap piston springs from original one. The stiffness did not changed. I guess it same situation of your 7/8" BMC.

Since I rebuild, I give a shot to put it back whether it works or not.

pumping brake pedal more than 300 times, the piston from caliper did not comes out nor other piston moves.

I guess I need to rebuild caliper again...

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   2 Members, 0 Anonymous, 153 Guests (See full list)

  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.