Brake Problems!
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Junior User
Joined: Aug 2002
Posts: 94
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Brake Problems!
Guys I have a severe problem and need your help. There is a junction box mounted on my front axle that my back and front brake lines are hooked to and of course the main break line coming from the master cylinder. Well my problem is the fluid is not going to back brakes. It's not working properly it barely seeps back there and I need to know what exactly its called and maybe where I could get another one. Has couple of electrical wires to it also someone said it's electrical I have no idea. All help is desperately needed. 
Thanks
Keith Prather
78 Ford F150
Thanks
Keith Prather
78 Ford F150
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Brake Problems!
There are several threads here on proportioning valves. In your case the valve may have shifted and blocked off the rear brakes just like it is supposed to do in case of a brake failure. Check all of your lines to find out why it shifted then reset the valve by bleeding some fluid from the front brakes. If it will not recenter itself it will need to be replaced. The wires are for a switch that activates your brake failure warning light in the dash. If the light is working you can turn the switch to the ACC position and watch the light to see if it goes out when the brake is depressed and a little fluid is released from the front brakes.
Thread Starter
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Junior User
Joined: Aug 2002
Posts: 94
Likes: 0
Brake Problems!
Guys thanks for the info. I got my father in law to look at it and it needed replacing. So I went to a local junkyard today and found one. Just need to get it on the truck.
Thanks
Keith
Thanks
Keith
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Brake Problems!
Sometimes when they shift and the brake system has a lot of sludge and rust in it they stick and do not shift back. 
If you know what you are doing they can be disassembled and cleaned out sometimes.
If you know what you are doing they can be disassembled and cleaned out sometimes.
