69 factory calipers guru needed

[poppa]

IAm I goofy or ?? I got some calipers (4 piston Bendix originals) rebuilt and I just got them back. Am I suppose to be able to move these pistons around in the bores? How much clearance is there suppose to be between the bore and the piston? Thanks

[hemi71x]

poppa
I'm the guy that you sold the spindles to.

The pistons in the calipers are pretty much a loose fit.
It's the "lip" seal on the piston that keeps the fluid in the bore from going everywhere.
Don't know of a particular measurement between the piston and the bore diameter of the caliper housing.
I'll see if i can come up with a picture of a caliper piston that i could post. They are a unique design for the piston seal, and dust boot seal.
Were your caliper housings sleeved?
Jim V.

[UFO]

From the service manual.

[poppa]

UFO,Thanks for the specs. I will have to measure them tomorrow.


Jim,How's it going. I can push and pull these things by hand,never had any do that before so I had to ask. Recieved them with a piece of styrofoam in the middle to keep the pistons from coming out,they have a heavier spring than original. Thanks for the replies guys.

[hemi71x]

Having a piece of foam, or cardboard, to keep the pistons in their bores, is normal after a professional rebuild.
The reason you probably couldn't move them around before the rebuild, is because they were probably all gummed up, or stuck in their bores.
Here's a picture of what your caliper pistons look like. It's the only one that i could come up with in my files in the computer.
Jim V.