The Stovebolt Site Forums The Shop Area Driveline Lines from master cyl to proportion valve

Just a quick question dose it matter which line feeds the front or back I know the pressure is the same but the back of the master cylinder holds more fluid. I have heard use the bigger bowl for the front because your front pads wear quicker?

Hy E.C. RatRods, If your vehicle has a combination of disc and drum brakes, then yes it most definately matters where the primary (closest to the brake pedal)system is plumbed, and the secondary system is plumbed. One of the functions of the proportioning valve is to limit pressure to the drum brake system to prevent drum brake lockup. I would recommend following the plumbing schematic of a vehicle that uses the components you will be using in your brake system, hope that helps.

As a general rule, the bigger reservoir is for disc brakes. Picture this, a caliper has a bigger fluid capacity compared to a wheel cylinder. As the pad wears, the caliper reservoir behind the piston requires more fluid to replace it than it would compared to the area inside a wheel cylinder. Look at a Corvette master cylinder. Equal bowls as the Corvette (except for some early versions ) were always disc and disc.

Ok I figured as much but wanted to make sure thanks for the feed back.

This brings up another question. On the new under the floor MC set ups, the reservoirs are the same front and rear.

Both are large capacity. At least the CCP one I got is.

Will it matter with a front disc and rear drum set up as long as the proportioning valve is working correctly?

Hy Roy Rodgers, I believe the primary reservoir is usually plumbed to the front brakes, hope that helps.