Porportioning valve and brake switch mounting - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-15-2005, 09:31 AM
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Porportioning valve and brake switch mounting

Does it matter where the Porportioning valve and the brake pressure switch are mounted. I have a firewall mount master cylinder. I was thinking about mounting the porportioning valve on the frame in the engine compartment. My other options are on the fender or on the firewall. Anyone have a suggestion? Also what is the best place to mount the brake pressure switch? Front brake line or back brake line, close to the master cylinder???

This is going on a 57 Willys Wagon 4x4.. Disc and drum setup..

Pete

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Old 02-15-2005, 11:01 AM
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The proportioning valve can go anywhere it is convenient near the master cylinder. I have seen them attached to the master cylinder with very short connecting tubes and clear down on the frame with long connectors. I always put the brake light switch in the rear brake line since it is a lot less cluttered and easier to access there. Can go anywhere in any line.
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Old 02-15-2005, 08:20 PM
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Personally I do not like the brake light pressure switches. On my 34 it came with the brake light pressure switch mounted on the frame rail. After I moved the MC and replummed the brake lines I found that it took quite a lot of pedal pressure to activate it. I suspected the switch was bogus. Ordered two from Performance Plumbing. Same story with both the new ones. Pulled it out, replaced the line and got a pedal activated switch.

Vince
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Old 02-15-2005, 08:32 PM
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tech

NHRA rule 3:1 prohibit the mounting of brake lines or proportioning valves on the inner frame rail/bellhousing area unless boxed by 1/8" steel.
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Last edited by bracketeer; 02-15-2005 at 08:38 PM.
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Old 02-18-2005, 12:08 PM
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I'm building a 61 Wagon right now and brakes are on the do-to list. I have disc/drum as well, can you tell me about your set up? Got any pics?
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Old 02-18-2005, 12:14 PM
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I have axles from a 85 jeep wagoneer. disc in front and drum in the rear. I'm in the process of restringing if you will all of the brake line. What do you want pictures of? Where are you located? Pete
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Old 02-18-2005, 12:15 PM
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No pics

You can purchase a manual adjusted proportioning valve that is very small and hooks to the rear brake line only. You install it on the rear brake line just below the master cylinder. Run the brake line down the firewall and feed it between the inner fender and outer frame rail. Run the brake line down the outer frame rail until it is safely past the bell housing and feed it back over or through the frame rail to the rear of the car. Not a good idea to feed it under the rail as it will probably get damaged.
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Old 02-18-2005, 01:51 PM
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I just did mine on a '46 Chevy Panel and I did like Willy's said. I have a firewall mounted MC and a frame rail mounted valve right under the MC with the pressure switch just below the booster close to where the wire harness will come through the firewall. Don't have pics yet and still nedd to do some touch up on the lines but it bled out just fine( after alittle help)

David
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