72 C20 rear end
 

I have a 72 C20 , originally a 402 TH400, coil spring truck. it has a Dana rear end.

My question is concerning brakes.

What determined what size brakes were installed on these trucks ?

Was it engine ? trans ? coil or leaf spring ?

I noticed that the brake shoes are listed by spring style and are 2 different sizes ,,, why would spring style dictate brake size ?

Thank you in advance for any and all information !

Have a great day !

Tom

Re: 72 C20 rear end
 

For 1972:

C/K10s are 11x2" rear brakes
C/K20s are 11x2.75"
C30s are 13x2.5"

This is from the GM Heritage Center information:

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Re: 72 C20 rear end
 

Napa and Rock auto both list
w/ Coil Springs;w/ 11 5/32" X 2 3/4"

w/ Leaf Springs;w/ 12" X 2.5" Brakes

Wow ! More confusion .................

Re: 72 C20 rear end
 

Dana axle more than likely to have the 12'' brakes