Brake proportion valve
#1
Brake proportion valve
1976 Ford F-250 standard cab standard bed 4x4 high boy with 390 power steering power brakes dual piston front disc brakes drum rear brakes
Trying to decide what to do with the brake differential valve. I have the original but it's rusty nasty looking. I am going to have a completely new brake system, calipers, wheel cylinders, lines, brake booster brake master cylinder.
I started to take my valve apart, I was hoping I could just clean it up and put it back together, but I can't get the spring plunger bleeder deal out. Maybe it's rusted in? I got the proportioning valve and brake pressure switch out and all the lines. And there are a few seals I would have to get.
Should I go with an after market valve? If so how do I decide which one to go with? How difficult is it to get it dialed in to work well? Mounting in same location? fittings size? I would like to find An easy to use replacement.
How am I going to be able to bleed the air out of this completely new system? Any tips or tricks?
Thank you
Steve
Trying to decide what to do with the brake differential valve. I have the original but it's rusty nasty looking. I am going to have a completely new brake system, calipers, wheel cylinders, lines, brake booster brake master cylinder.
I started to take my valve apart, I was hoping I could just clean it up and put it back together, but I can't get the spring plunger bleeder deal out. Maybe it's rusted in? I got the proportioning valve and brake pressure switch out and all the lines. And there are a few seals I would have to get.
Should I go with an after market valve? If so how do I decide which one to go with? How difficult is it to get it dialed in to work well? Mounting in same location? fittings size? I would like to find An easy to use replacement.
How am I going to be able to bleed the air out of this completely new system? Any tips or tricks?
Thank you
Steve
#3
#4
I went with the proportioning valve from bronco graveyard and bought there stainless brake lines. They get there lines from inline tube. I am having trouble with some of the fittings leaking. Everything is new so I don't no what the trouble is. I would definitely ditch that old proportioning valve.
#6
I went with the proportioning valve from bronco graveyard and bought there stainless brake lines. They get there lines from inline tube. I am having trouble with some of the fittings leaking. Everything is new so I don't no what the trouble is. I would definitely ditch that old proportioning valve.
#7
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#10
Stainless can be double flared but it's much more difficult to do (compared to steel or NiCopp lines) with regular flaring tools without ending up with deformed or cracked flares in the stainless tubing.
When making double flares, it's OK to crank down on the 1st stage of the double flaring process. However, you don't want to do the same on the 2nd stage of making the double flare. The final compression of the double flare process should come when you tighten the line into the MC port, brake valve port or the flexible brake line port.
If the double flare stage is already compressed flat against the 1st stage, at the time you go to tighten the line into the port, there's no 'crush' left in the double flare to form to the port seat to seal the flare off.
#11
For the prop valve, the Bronco Graveyard offering sounds good. In line tube also offers a "non exact" replacement.
As far as lines go, I prefer mild steel because it seals better and can be modified with common tools. SS is hard to work with and needs high end flaring tools.
You could use a generic prop valve on the rear brakes lines only (eg. Wilwood). This would require customization of the lines. Also adjustment by trial and error. May work OK but no experience... though I may try it in the future.
As far as lines go, I prefer mild steel because it seals better and can be modified with common tools. SS is hard to work with and needs high end flaring tools.
You could use a generic prop valve on the rear brakes lines only (eg. Wilwood). This would require customization of the lines. Also adjustment by trial and error. May work OK but no experience... though I may try it in the future.
#12
The idea with a proportion in valve is that you want the front to lock up before the back, this seems backward but the basic result is that when you lock up the brakes you go straight instead of fishtailing. The easiest way I know to do this is to wait for a rainy day and find a place that you don't have to worry about traffic, and start with the the valve adjusted with more to the front (more pressure to front wheels) and slowly adjust more pressure to the rear until you lock up the rear wheels first, then adjust it back 1/4-1/2 turn until the rear no longer locks up. There might be a better/safer way to do this but this is the way I know how to do it.
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