Brakes are dragging. Why? - Ford Powerstroke Diesel Forum
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Old 03-29-2009, 12:31 PM
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Brakes are dragging. Why?

Hello. I have a 99.5 F250 Superduty with the famous 7.3. Have had it for years and love my truck. Recently, i'll take off down the road and with in 10 miles the brakes are so tight that the cruise will kick off and I have to pull over. I let them cool off a little and then when I try to go something will release in the brake system and everything will be ok for a while. I have had the brakes all off and I have no rust or non floating issues. I think I have residule hydraulic pressure. as I have to open a bleeder to get the pistons to go back into the calipers.

My question. Is there a check valve or a pressure spliting valve sticking or do I have a lousy master cylinder?

Thanks in advance
Mr. Brookville
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Old 03-29-2009, 01:16 PM
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You may have a piece of the rubber hose loose on the inside acting like a check valve, ive seen that happen before.
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Old 03-29-2009, 02:36 PM
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Sounds like the master cylinder to me but JAKE has a good point as well.
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Old 03-29-2009, 02:47 PM
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Quote:
Originally Posted by Jake View Post
You may have a piece of the rubber hose loose on the inside acting like a check valve, ive seen that happen before.
my old chevy did that. at ten years old there prolly ready to be changed anyway. im looking into the stainless steel hoses.good luck, hope you get it fixed.
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Old 03-29-2009, 04:34 PM
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I would accept that with out question if it was one wheel or front/rear but it seems to be all 4 wheels. I guess I'll try a master cylinder.

Thanks for your thoughts.

Mr Brookville
By the way jake, you have the twin to my truck if yours is a 6 speed.
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Old 03-29-2009, 05:08 PM
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What you need to do is find out which one is sticking and take the wheel off. Then you need to remove the caliper, the slides that allow the caliper are bad about sticking. If they are froze, with a little heat and a pair of channel lock pliers or something to twist the slides you can free them up. If the slides are free, then try to compress the caliper. I have also seen the pistons stick, if you cant compress the caliper back with the bleeder closed then open the bleeder screw and try that. If the piston moves in withe bleeder open the brake hose is bad. Hope this helps.
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Old 03-29-2009, 09:37 PM
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I had the same problem! Took me forever to figure out what it was.
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Old 03-29-2009, 09:42 PM
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Sorry, I had my left foot on the brake .
Sorry man couldn't resist being a dumb and smart a$$ for just a sec. My wife gets pissed when I do that. Just funnin' ....... good luck with a solution!
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Old 03-29-2009, 09:52 PM
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I had that problem on my 81 and it was the proportioning valve.
just throwin out options to check.
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Old 03-30-2009, 02:51 AM
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well i'm gonna get new hoses for the back end tonight and see if they have a proportioning valve also.

Thanks for your help. Confirmed what I was thinking.

Mr Brookville
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