AuroraGirl
Full Access Member
- Joined
- Sep 8, 2019
- Posts
- 10,145
- Reaction score
- 7,504
- Location
- Northern Wisconsin
- First Name
- Taylor
- Truck Year
- 1978, 1980
- Truck Model
- K10, K25
- Engine Size
- 400(?), 350
It depends on the masterMaybe mine is wrong, but it is as it came from the factory as far as I know, and the small line is hooked up to the front port of the master cylinder. I was always under the impression that the rear port is rear brakes, front port, front brakes. When I swapped in front disc on my 65 C20, I did it just like this and never had any braking problems.
Granted my 81 is a C20, I think the small line is supposed to go on the front port. Here is a pic of my C20 master cylinder...
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Delco-Morraine vs Bendix vs whoever else they sourced them from, and the size of them
The low drag brakes have different masters than the earlier ones, and the ports are sometimes different
The combination valve in a split reservoir truck wouldnt have to block the flow, the leaky circuit will drain out and youll have one or the other
But in the gmt400 years, i believe they do that because of the shared reservoir, which only has a small dam that prevents fluid when low from all being consumed but would let it leak until then without the combination valve