[Bronze68]

I've never owned a Chevelle with factory discs. I had assumed the proportioning valve for a disc brake car was located on the frame like drum brake proportioning valves. I see many of the new proportioning valves are mounted directly under the master cylinder. Is this the original factory location?

Does anyone have pictures of an original?

 

[HKalin]

I have a 71 Malibu that came with factory power disc brakes on the front. It's not called a proportioning valve it's called a combination valve on 71's and is mounted on the frame rail under the power booster. The first picture shows the lines coming off the MC that run down to the combination valve.The first new combination valve I put on the car leaked before I even got to bleed the brakes. As you can see it's a bitch to get in at it with the headers on. Thank God I went with Silicone fluid because it was all over the newly painted frame.

 

[blue_69_malibu]

Wow....that's a very clean car down there.

 

[Bronze68]

OK, thanks. That is tight. So, my car is not going for 100% original and is much more a resto-mod. I'm keeping much of its GM-ness, but upgraded some of the fun stuff. It has Wilwood discs all around, but I'm using a GM-style master cylinder. I'm not doing power brakes, however.

So, seeing that, am I smarter in this case to use the aftermarket combination valve that's up by the master cylinder? I do not have the headers on yet. Seems like it would be "cleaner" to keep it on the frame.

 

[HKalin]

OK, thanks. That is tight. So, my car is not going for 100% original and is much more a resto-mod. I'm keeping much of its GM-ness, but upgraded some of the fun stuff. It has Wilwood discs all around, but I'm using a GM-style master cylinder. I'm not doing power brakes, however.

So, seeing that, am I smarter in this case to use the aftermarket combination valve that's up by the master cylinder? I do not have the headers on yet. Seems like it would be "cleaner" to keep it on the frame.

The valve may be different if you have disc brakes all around.

 

[DUTCH MAX HEADWORK]

71 was the year of the switch from a distribution block/shuttle valve, metering valve, and disc hold-off valve to a single combination valve that carries out all 3 functions in one package.

 

[Chevelle_Nut]

Wow....that's a very clean car down there.

I can't keep mine that clean, it likes to be on the road burning gas.

 

[Droptop72]

On my 72' I moved the valve from the frame up to the master cylinder this last winter because the frame is such a God-awful location. I called Inline Tube and told them what I was doing, and they sold me the lines to make the change.