Rear Caliper Piston Trust Bearings (Page 1/1)
cone shark MAY 10, 11:17 AM
Does anyone know of a source for these? My '88 Formula has inoperative parking brakes.

Years ago I was able to fix the parking brakes on my '87 by flipping the hardened
washers as they had slight corrosion one side. The ball bearings were fine.

With the '88, the ball bearings look like little peppercorns and unfortunately I shattered one of the hardened washers.
OldGuyinaGT MAY 11, 05:32 PM
I think I have an answer for you!
First, many thanks to Silicoan86 for

1988 Rear Brake Caliper Internal Piston Seal Found (works for Pre-88 too)

Last year I was rebuilding my spare pair of rear calipers when I broke a hardened washer and also damaged the bearing cage. I went searching and found these:



They fit well (clearance is a little closer on the adjusting screw). One other concern was that the outer diameter of these hardened washers is a bit larger than the originals, but larger enough that they won't sit flat in the bottom of the stamped bearing cover. My solution was to install one of the remaining original washers between the cover and the new hardened washer. Everything stacks properly that way, and compresses the spring less than 1 mm more than stock.



I have reassembled the calipers and they seem to be adjusting/operating well. I have not installed these on the car yet (the ones on it ain't broke, so...) but may later this summer. Sure looks and feels like it will work though, and these bearings are much better and stronger than the originals.

[This message has been edited by OldGuyinaGT (edited 05-11-2023).]

cone shark MAY 14, 12:42 PM

quote
Originally posted by OldGuyinaGT:

I think I have an answer for you!
First, many thanks to Silicoan86 for

1988 Rear Brake Caliper Internal Piston Seal Found (works for Pre-88 too)

Last year I was rebuilding my spare pair of rear calipers when I broke a hardened washer and also damaged the bearing cage. I went searching and found these:



They fit well (clearance is a little closer on the adjusting screw). One other concern was that the outer diameter of these hardened washers is a bit larger than the originals, but larger enough that they won't sit flat in the bottom of the stamped bearing cover. My solution was to install one of the remaining original washers between the cover and the new hardened washer. Everything stacks properly that way, and compresses the spring less than 1 mm more than stock.



I have reassembled the calipers and they seem to be adjusting/operating well. I have not installed these on the car yet (the ones on it ain't broke, so...) but may later this summer. Sure looks and feels like it will work though, and these bearings are much better and stronger than the originals.




Thank you. The washers alone might get me going. I might be able to find 6 ball bearings to rebuild the original cages.

It looks like the bearing you posted uses a non-metal cage. I wonder if will have any trouble with heat and brake fluid?
OldGuyinaGT MAY 18, 01:12 PM
Sorry to be so long replying regarding the exposure to brake fluid question.

I did check this, but the only information I could find was that this bearing is rated for "medium to heavy-duty applications: and "lubrication required". In the absence of better information and other bearings that will fit here, I'm going with that. I'll post results after I've had them in use (but may be a while).