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Old 08-02-2006, 10:27 AM
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Nova disc brake question

I recently got a 1970 Nova to work on. The car came with it's original dealer sheet that does not indicate it came with front disc brakes, however the car does have them so I am assuming an aftermarket kit was used or the pieces were taken from a car that did. THere are no lines attaching anything up front, and I am wondering If i am missing anything, like a proportioning valve? Basicly there is a rectangular box with a few ports in it that sits under the master cylinder...if i were to hooke lines up would everything work?

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Old 08-04-2006, 12:10 PM
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That doesn't sound like a proportioning valve, a pic would help. Front disks/rear drums requires one........
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Old 08-04-2006, 12:46 PM
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I think what you have there is a combination valve/distribution block (if memory serves me correctly from when I took apart my '74), which may or may not work if discs have been added. It wouldnt hurt to try it out, but you may need to get a new one anyways like poncho said. Are you sure those arent original discs?
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Old 08-04-2006, 01:50 PM
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the block under the master is a proportioning valve. if it is the right one for your disk brakes it will have 2 lines that come down from the master to the side of the block then it should have 2 places for front brake lines in the front and one on the back for the rear brakes.I have included a couple pictures to help you.I have a line lock and a pressure switch for the brake lights on the line from the master to the block for the front brakes, yours will not it will be a regular brake line.If you have any other questions you can email me directly and I will answer them. Good luck and enjoy your Nova
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Last edited by DOUBLEDICK; 08-04-2006 at 02:12 PM.
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Old 08-04-2006, 09:24 PM
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Some of the proportioning valves were cast iron instead of brass, but they're about the same size. Drum-brake cars used a smaller valve assembly.
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Old 08-04-2006, 11:52 PM
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My 70 Nova had disc brakes from the factory, as far as I know, so I went out and took a couple of pictures. Like has been said, it has two lines coming down from the master cylinder into the proportioning block/valve, two lines going to the front disc brakes and one line going to the rear drums.

Hopefully you can compare these pictures to what you have. The big rusty thing in the top of the pictures is the master cylinder.

Pic 1: Front
Pic 2: Left (driver) side
Pic 3: Right (passenger) side

Hope this helps.
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