Question on 65 disc brakes
I am rebuilding my brake calipers on my 65. It has disc. brakes. I purchased the parts and found the springs they sold me for the front were a different diameter and length then the ones I took out. Should the front and rear springs be a different size? I have no choice but to assume the ones I took out were correct. Is there a repair manual I can buy that will show detailed rebuild of brakes, motors, altenators, etc.? Thank you for the help. Joe
-
-
Comment
-
Re: Question on 65 disc brakes
Thank you for the replies. I don't know if they are guided. I don't know what it would look like compared to any other kind. I will check out the back of the restorer, good idea. JoeComment
-
In Appreciation of John HinckleyComment
-
Re: Question on 65 disc brakes
Hi Joe: No they don't have the screw. I have checked with 3 different vendors and all of them have the shorter spring on the front brakes. I guess I am trying to understand why the piston on the front is larger and the spring they recommend is shorter. When you put the short one in place it dosen't push the piston out. It seems to be to short or to weak, I'm not sure. There is a tool called a "piston retainer" you use when you put the caliper back on the disc to hold the piston in., but with this short spring the piston doesn't push out. I need a little guidance. ThanksComment
-
Re: Question on 65 disc brakes
The front springs are a little larger in diameter and shorter. That is normal, but, they should push out on the piston.Comment
-
Re: Question on 65 disc brakes
Joe------
If the pistons don't have the insulators (and screws retaining them), then these pistons and, likely, the calipers are not original to the car. Original calipers will all have casting number 546xxxx on each caliper HALF.
As Wayne mentioned, the springs for the front and rear are a different size. The GM springs are discontinued. Inasmuch as the calipers are not original to the car, the springs you took out are not likely original, either. In any event, if you purchased the springs you have from a reliable source, I expect they are functionally correct, even if they differ from the ones you took out.
However, the springs are re-usable. So, if the ones you took out do not suffer from any corrosion damage, you can re-use them if you wish.In Appreciation of John HinckleyComment
-
Re: Question on 65 disc brakes
Joe-----
Here is a photos of what I believe to be original GM caliper piston springs.
The larger spring on the left is what I believe to be a GM #5466733. This is the spring used for the FRONT pistons from L1967-82. It also became the SERVICE spring for earlier applications. It is 2-3/4" free length and 1-3/16" OD
The spring in the center is what I believe to be a GM #5465964. This spring was used for 1965-E67 applications. It is used with FRONT calipers with guided pistons. It is 1-3/4" free length and 1" OD. It was replaced for SERVICE by the above.
The spring on the right is what I believe to be a GM #5465915 65-82 rear caliper piston spring. It is 2-1/8" free length and 13/16" OD.
All of the above are GM-discontinued.
I have also learned that aftermarket replacement springs for 65-82 applications may be configured differently than the above original springs. One reason for this is that many aftermarket springs are stainless steel whereas originals were not. This necessitates somewhat different size and configuration. However, most should provide spring pressure and performance more-or-less equivalent to original springs.In Appreciation of John HinckleyComment
Comment