Brake Help Needed
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Joined: Sep 2019
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From: Rhode Island
Brake Help Needed
I just bought a 1991 Dodge B250 van. Generally in good shape, but some of the brake lines are badly rusted so I wanted to replace them. I also wanted to replace the two valve assemblies behind the drivers' side wheel on the chassis. I've spent all day trying to locate the part numbers only to find they are discontinued! There seems to be a Proportioning Valve (Part# 52004840/52004841) which has superseded model numbers and seems easy to find a new version of, and a Pressure Limiting Valve (Part# 52004016/R2004016) which I cannot find anywhere. Does anyone know where I could get the Pressure Limiting Valve from? Even if it's for a newer model, the 2500 for example, it is probably the same basic part. I am custom-making the lines so I can put a custom fitting for the PLV that is different from stock fitting.
Also, from looking at the brake lines, they seem to be SAE fittings and 3/16" dia pipe. Is that right? I've been fooled before with a GM car which turned out to be metric.....
Also, from looking at the brake lines, they seem to be SAE fittings and 3/16" dia pipe. Is that right? I've been fooled before with a GM car which turned out to be metric.....
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Joined: Apr 2010
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From: Clayton MI
For the valves, why do you want to replace them? They rarely fail.
For the lines, take out a selection of the fittings, with a couple inches of line, take them to the parts store, and have them matched up, and buy the lengths you need. Or, get a roll of the NiCu (nickel/copper) brake line, and just use that. It doesn't corrode nearly so quickly.
For the lines, take out a selection of the fittings, with a couple inches of line, take them to the parts store, and have them matched up, and buy the lengths you need. Or, get a roll of the NiCu (nickel/copper) brake line, and just use that. It doesn't corrode nearly so quickly.
Thread Starter
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Registered User
Joined: Sep 2019
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From: Rhode Island
Yeah, I was going to use the cupronickel pipe. I found out about it this summer and I wouldn't use anything else now.
Although the valves still work OK, the steel lines (and nuts) are so badly rusted that I doubt I can get them all out without damaging the valve body. And that means waiting for a replacement part to arrive. Also it will get harder to find the parts as time goes on, so I would rather suck it up and replace them now while I am doing the lines
Although the valves still work OK, the steel lines (and nuts) are so badly rusted that I doubt I can get them all out without damaging the valve body. And that means waiting for a replacement part to arrive. Also it will get harder to find the parts as time goes on, so I would rather suck it up and replace them now while I am doing the lines
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Joined: Apr 2010
Posts: 87,483
Likes: 4,223
From: Clayton MI
Clean the fittings off as best you can, soak them with chemicals. (PB Blaster is my personal choice) Cut the line right at the end of the flare nut, put a SIX point socket on it, and give it a twist. Works great 99% of the time for me.
