I have a pair of Delco Moraine front calipers for a 70 442 that I am restoring and the pistons and bores may be a little too pitted. There are a lot of options out there but looking for a good rebuildable set. PM me with what you have and we can go from there.
Thx

 

How pitted are they? As long as the seal groves are good you can have just a little pitting on the caliper bore, Just can't have any or peeling chrome on the pistons. I do like the replacement plastic pistons that some of the parts stores carry.

 

The bores can be sleeved.

 

PM sent

 

The single piston calipers are insensitive to pitting in the bores. Unlike the earlier four piston calipers, there is nothing that seals against the ID of that bore. The seal is fixed in a groove in the caliper bore and the plated piston slides in the seal. Unless the groove for the seal is pitted, you can reuse the caliper. No one sleeves these because it is completely unnecessary. If the chrome on the piston is bad, you can get replacement pistons.

 

Thanks for the info Joe. I didn't think sleeving these would make sense.
My pistons definitely need replacing and minor pitting inside the bore so maybe Ill give them a try? Who would be a good source for new caliper pistons? I see previous response mentioned plastic which is new to me. Anybody have any thoughts?

 

I've purchased new chromed pistons from RockAuto in the past. They are priced very low and mine were Raybestos brand. They probably have the rebuild kits as well....the dust seal and the inner O-ring. Probably also Raybestos.

 

It is actually called phenolic. They transfer less heat to the brake fluid but that is not that big of deal in our cars for what we use them for. They are supposed to slide easier in the seals and release better also. They also will not rust when moisture gets in the system, not that it matters because everything else will. I got them for around $12 each somewhere but can't remember for sure where. I want to think it was Car Quest.

 

Interesting, thx

 

I had all my cores rebuilt, have many original rebuilt sets ready to go.
If that works.
By the way, 636, 637 suffix part numbers are for the 1970 "A" body.
Thanks.