Caliper Rebuild

[Charles Warner]

Does anyone have experience using White Post Restorations for racing calipers? I have 8 atlantic calipers that need rebuilding.

Thanks,

[stonebridge20]

Make sure they don't sleeve the bores.

[Charles Warner]

Thanks. Anyone have alternate suggestions?

[R. Pare]

When you say "rebuilding", what exactly needs to be done to them other than new seals?

[Charles Warner]

When you say "rebuilding", what exactly needs to be done to them other than new seals?

To be honest, Richard - I don't know. History of all 8 Atlantic calipers (CP2631)is unknown. They came in 4 lots of a left and right each. They all look like they've been removed from cars and sat on the shelf. Some are simply dirty, one pair has been painted. I haven't tried removing the pistons yet.

Thoughts?

[R. Pare]

See if you can pressurize them somehow to check for leaks at the bleed screws and crossover pipes. If no leaks, go ahead and remove the pistons so you can inspect them and the bores for wear. If all looks OK, just clean them up and replace the seals.

What brand are these?

[Charles Warner]

Ap/lockheed

see if you can pressurize them somehow to check for leaks at the bleed screws and crossover pipes. If no leaks, go ahead and remove the pistons so you can inspect them and the bores for wear. If all looks ok, just clean them up and replace the seals.

What brand are these?

[DanW]

Essex Racing should have the rebuild kits for you, replacement pistons as well. If the pistons show fretting corrosion where the seals ride, you may clean them up, but replacement is recommended.

https://apracing.com/race-car/brake-...o267x21mm-disc

Regards,
Dan Wise

[Charles Warner]

Thanks Dan.

Essex Racing should have the rebuild kits for you, replacement pistons as well. If the pistons show fretting corrosion where the seals ride, you may clean them up, but replacement is recommended.

https://apracing.com/race-car/brake-...o267x21mm-disc

Regards,
Dan Wise

[Jerry Kehoe]

Years ago Steve Jennings taught me how to rebuild calipers of most kinds. Hot soapy water, scotchbrite, to clean the bores and pistons and since at least on the AP calipers the pistons are hard anodized most of the crud is surface based they clean up well. If they were gouged in any way or rough then replacements were always available then new seals and plenty of rubber grease. Only tricky part were the seals used with the screw in plug and to remove them ( which you mostly never have to ) you had to make a tool so you wouldn't bugger the plug. Mostly though it is wise to leave them alone unless you know you have a leak. Cleanliness is most important and Jennings drilled that into me, one of the many things he and Bahner drilled into me over the last 50 years!