Master Cylinder line issues

[BuckTruck16]

We have a '79 k10 with a 5.7L, with a disc/drum setup. We just replaced all the lines but are not sure what lines go to what. As in, the master cylinder has 2 ports. The one in the front is larger than the one in the back. Is the bigger port in the front for the front breaks or rear? And which one goes in which for the proportioning valve?

-Thanks

[BuckTruck16]

Any luck?

[Keith Seymore]

The larger part of the reservoir, regardless of whether it is at the front or the rear of the master cylinder, goes to the front discs. This is because the disc brake pistons take more fluid to actuate than the rear wheel cylinders.

I believe that same brake line goes into the proportioning valve because it has a "hold off" feature which keeps the discs from applying until the slack has been taken up in the rear shoes.

K

[BuckTruck16]

Thanks Keith, your always there to help me. Appreciate greatly!

[motornut]

on my 78/79 the larger line is the rear,smaller res hole
from the valve it goes two small to the fronts
1 large to the rear