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OK....................here is what I have......................the parts book is an original Chevy dealer book dated Oct. 1, 1965. Sorry but I have only the secondary, rear pull back springs.
Thanks, was not in the 72 version. Already removed.
Anyone....... good used ones would work too! What you got?
The J65 return springs are designed to work with higher temperatures than standard lining. Supposedly, they are a slightly different material.
I think return springs for standard lining would work as long as you're not racing or heavy on brake application from high speed. They're the same dimensionally but I think the material changed.
Also, by the early/mid 70's, GM released a brake spring kit that was shown for standard lining and metallic brakes. One kit serviced both. I have to guess that the set contains springs designed for the metallic shoes but that would also work for standard shoes. That way, one part number could service both.
I don't know if the part number is still available from GM but, if not, it would be much easier to find than the original individual springs. The part number for the kit is 3981988. One part number services one wheel and should contain all the springs for that wheel.
Thanks Critter. Back in the day, around 74, I bought springs from GM (probably weren't the correct ones since they were disc.) and installed them. If you've noticed and followed my posts, you may know I'm re-restoring this 64 that has 0 road miles since, but lots in the back of moving vans. When disassembling those "new" springs, one or more broke! So I figure if I gotta replace them, why not search out the real ones. If not, your solution is correct.
The springs hold the linings back from contact. They have nothing to do with the amount of pressure the cylinder exerts on the lining to drum. With that in mind, ..... why would there be a difference ? In the 60s when they ran 24 hour races with drum brakes temps might have affected the springs but not to the point of complete failure. If color coding helps, PPG is your friend.
The springs hold the linings back from contact. They have nothing to do with the amount of pressure the cylinder exerts on the lining to drum. With that in mind, ..... why would there be a difference ? In the 60s when they ran 24 hour races with drum brakes temps might have affected the springs but not to the point of complete failure. If color coding helps, PPG is your friend.
Metalic lining can and does create a lot more heat than conventional lining. Because of this, a different material was used for the shoe return springs.
No one here said that the springs had anything to do with the pressure exerted on the shoe.
Metalic lining can and does create a lot more heat than conventional lining. Because of this, a different material was used for the shoe return springs.
If you have ever had metallic shoes and used them like intended, you understand just how much heat those brakes generate and in the meantime, put your little wet nose against the windshield.
If you have ever had metallic shoes and used them like intended, you understand just how much heat those brakes generate and in the meantime, put your little wet nose against the windshield.
Yup, friction creates heat. Lotsa heat. That's what makes standard return springs fizzle when used with metallic lining. They loose tension and also break often. I know this to be true.
03-15-2017, 11:26 AM
