1977 K10 brake system

[jahin77]

I have a 1977 k10 trailering special and the brakes seem to be different from a standard 1/2 ton truck. The master cylinder has two 9/16 brake lines that go into it compared to the standard 1/2 and 9/16. I’m looking to replace the master and the brake booster and not exactly sure on what parts to order. I think the brakes in it is the JB6 system. Any additional information is appreciated.

 

[Bent77]

I can look at mine in the morning, maybe @max 02 can peek at his

 

[max 02]

Mine won’t be much help. I swapped to a 1981 hydro boost system years ago.

I can’t remember if the lines were the same size or not. Plus my truck was originally a c10

Sorry.

 

[Bent77]

@jahin77 sorry for the delay
This is the original master cylinder for my 1977 K10. It is not a Trailering Special, but fittings at the master cylinder are 9/16”
I think it the same master, and the differences for the trailering special are elsewhere

 

[jahin77]

@jahin77 sorry for the delay
This is the original master cylinder for my 1977 K10. It is not a Trailering Special, but fittings at the master cylinder are 9/16”
I think it the same master, and the differences for the trailering special are elsewhere

View attachment 381502

Ok thank you. I’m still searching around and looking for parts.