The Stovebolt Site Forums The Shop Area General Truck Talk wheel cylinder bolts

I went to replace the front brakes on my 66 c-10, and they were completey bare. Any idea what size the wheel cylinder bolt is?

I'm not sure what you mean by "wheel cyl bolts". If it the mounting bolts they are 5/16 coarse thread. About 1/2 in long.

the bolt that mounts the wheel cylinder to the control arm.

Do You mean the backing plate to the arm?

Joe

its the bolt that mounts the wheel cylnder to the spindlenot the backing plate to the contol arms. it is a large bolt.

Captain,

I think something is being lost in translation here. The wheel cylinder is the small hydraulic piston that actuates the brake shoes on each wheel. It should be held on with two small bolts that go through the backing plate.

Is this what you are referring to. There is a large round hole in the backing plate that a machined step on the wheel cylinder goes through. This machined step has the bleeder and the threads for the brake line in it.

Does yours work this way too!

Stuart

no not on a 66. there are 2 smaller holes that attach the backing plate on. there is the larger hole for the brake line, and the bleeder. then there is a hole above that one for the mounting bolt.

I think you are talking about the shoe stopper that has the spring anchor built into it that sits just above the cylinder. It's more that just a bolt I think. It should look simular to the rears if you want to look at it.
Scott

The top hole is not for the wheel cylinder, that is the anchor pin for the brake return springs. It's the 2 smaller bolts that actually hold the wheel cylinder on. The backing plate is held to the spindle by 4 bolts, should be 2 short and 2 long bolts, 1/2' diameter. The GM Duo-Servo brake system (Bendix style) is more or less the same from 1951 to 1999, with the addition of a self adjuster in the mid '60s.

thank you 48bigtrucks. longbox, you are confusing yourself.

Not sure I follow. I'm an ASE Certified brake mechanic by trade.

Well the wheel cylinder on my 1966 c-10 pickup is only mounted by the one bolt, which also has the anchor for the springs.

Looks like the Captain was right on! Who would have 'thunk'!

http://www.partsamerica.com/product...ber=2037026&PartType=232&PTSet=A

Stuart

That's certainly different from anything I've ever seen. Must have only been used for a few years. Looks to take a special bolt, since it also serves as the return spring anchor. I could find no listings for one, not even in Dorman.

Another weird GM idea, like that goofy passenger side mounted hydraulic clutch they used for 61 and 62, or one of those years...