Brake caliper rebuild

[turbo owner]

I have a piston that is stuck on a rear caliper, 4 piston Brembo on my 79 turbo. I need some ideas on how to get it out, I've soaked it with PB blaster and use air to pop it out.

It would not budge, I tried using a C clamp to break it loose. After using a hammer on the C clamp thinking if I could break it loose it would move then. It did, now it's bottomed out and still won't budge using air.

What can I do to get it out?

[manbridge 74]

Hook it back up to brake line and pump it out with pressure. Or use greases gun method (messy).

[reachme]

I hooked up to compressed air with a trigger to control how much pressure (slow and steady is better than a big pulse)
1. Make sure you put a wood block on the center to absorb the force.
2. Also make sure wood block is thick enough so no caliper bolt pops out completely or all air will stream out there.
3. dint to it anywhere near a nice paintjob or the atomized brake fluid will spray in all directions when it gives.

Use a tool to spin/wiggle, not your fingers if you want to count to 5. It will come out

[turbo owner]

Originally Posted by manbridge 74

Hook it back up to brake line and pump it out with pressure. Or use greases gun method (messy).

I used the brakes to do the front because I knew they were stuck, thought I'd try the air method on the back. 7 of 8 worked fine, always seems at least 1 causes problems.

I used PB blaster and the bolts to clean the threads, taking them apart was a PITA.

I used anti-seize going back together and was able to screw them in by hand, I was dreading 1/8 of a turn installation.

I'll try to pop the stubborn one this evening when I have a helper

[turbo owner]

Originally Posted by reachme

I hooked up to compressed air with a trigger to control how much pressure (slow and steady is better than a big pulse)
1. Make sure you put a wood block on the center to absorb the force.
2. Also make sure wood block is thick enough so no caliper bolt pops out completely or all air will stream out there.
3. dint to it anywhere near a nice paintjob or the atomized brake fluid will spray in all directions when it gives.

Use a tool to spin/wiggle, not your fingers if you want to count to 5. It will come out

I drained all the fluid and then blew air in the calipers with the bleeder vales open to make sure they were empty before I attempted to remove the pistons.

I used the brake pads instead of wood blocks, I also had some thin strips of oak, about 1/8 inch thick and removed 1at a time until I could wiggle them free. That seemed to work pretty well.

I'll use the wood strips and the brake rotor as spacers when trying to remove the stubborn one this evening when I have help.