Brake Problem
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New User
Joined: Feb 2007
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Brake Problem
I have a 84 f250 with a 351 automatic, 4wd. Earlier this year did a brake job, full rear, brake booster, master cylinder. Everything was fine until a few months later, the front right caliper froze and wore the pad into the rotor. I replaced the parts. Ive bled the system every which way. I can gen get pressure only until i start the truck. After that nothing. I checked out the diverter and there is something on the end of it with a rubber nipple, im not sure what that is. But it has minimal brake fluid leaking out of it, hardly enough to see. I was wondering what you guys might think or have any ideas for me, I know its an old truck. Also what is the thing with the rubber nipple? thanks
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Joined: Jun 2005
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Some proportional valves (which I think you mean by the diverter, the thing mounted on the fram rail) have a small valve that needs to be opened or closed when doing a brake job/bleeding. I can't remember the specifics, but Chilton/Hanyes manuals describe this, and include a cutaway diagram of the proportion valve, showing you everything. It could be that you have the valve in the wrong position (you nee to push in or pull out a spring-assited valve, I can't remember which.)
-Tom
-Tom
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Joined: Nov 2004
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From: sunny fla sometimes windy
Setting the valve is just turning the key to on and stepping on the brake. How are
the rubber brake lines? They may be collapsing and holding pressure to the caliper
replacing them if they are old will definately be an upgrade to the braking power
since old lines can swell under pressure and reduce the pressure that actually gets
to the brakes!! Maybe a reiteration of your problem will give us a better idea of what
is going on, When you are driving and you step on the pedal what happens?
the rubber brake lines? They may be collapsing and holding pressure to the caliper
replacing them if they are old will definately be an upgrade to the braking power
since old lines can swell under pressure and reduce the pressure that actually gets
to the brakes!! Maybe a reiteration of your problem will give us a better idea of what
is going on, When you are driving and you step on the pedal what happens?
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well when the truck is off i have good pressure, but when i start it the pedal goes to the floor, not right to the floor though, there is a little bit of pressure at the end, and if i pump them up the pressure will build up but still will go to the floor if i hold it down hard enough. Im going to check the rubber brake lines tomorrow.
