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1997 f350 cab and chassis new upgraded booster new up graded master new calipers and new front rubber lines back brakes r completely blocked off but peddle slowly bleeds to the floor when truck is running when truck is off has firm peddle when truck is running and front lines r blocked has firm peddle as well

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Even though you have a new master cylinder, its sounds like you have a pressure bleed problem in it. The valve inside of it could be slowly letting the pressure by which could be causing all your woes. Take it off and bench bleed it to see if that resolve your issues.

Posted on Nov 18, 2013


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Posted on Jan 02, 2017

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SOURCE: 96 ford e350, brake pedal goes to the floor when running

Check for fluid leaks, possibly rear brake cylinders. has anything else been replaced prior to this concern?

Posted on Dec 17, 2008

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SOURCE: 1998 FORD F150 XLT 2WD - No Brakes when truck is running

We could have really went round and round for that one .. wouldn't you say .. but hey glad you were able to resolve it and that all is well . .but anyways thanks for using FixYa and we are here to help .. don't hesitate to look us up again .. Crayz

Posted on Mar 24, 2009

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SOURCE: brake peddle hits the floor when engine turned on

did you set up the brakes make sure that it is set

Posted on Aug 08, 2009

  • 233 Answers

SOURCE: how do you bleed the abs unit on a 1997 chevrolet truck

start by bleeding the master cylinder bleed the line closest to the fire wall, then proceed to the right rear wheel, left rear wheel, right front wheel, and then the left front wheel.

Posted on Sep 16, 2009

  • 1 Answer

SOURCE: I Hanve 1996 GMC 1500

did you try a brake booster ?

Posted on Oct 10, 2010

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1992 chevy siverdado 1500 Has new master cylinder,booster,brake calipers bled all lines back to front.drove a round the block The brake are soft with a hissing noise go to the floor some times.

Had the exact same issue with an 04 Cadillac srx. Replaced the booster twice...finally put my old "defective" master cylinder back on and brakes worked fine. Turned out the new master cylinder was bad...even though the symptoms point to the booster. Do check the vacuum hose going to the booster first though. Have seen those go bad and cause weird problems and it's the easiest thing to check first.

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I would think it is something going on with the master cylinder or booster. Even the ABS could be affecting it.

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Sounds like there is air in the brake lines. did you bleed the fluid until it came out clear? Not foamy color.

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You should have a hydraulic brake booster. a common failure item on fords and also would cause your symptom. the burning smell, I would go back and recheck all the brakes. Maybe a problem with the e-brakes, or an issue with the front or rear calipers. Possibly a damaged steel or high pressure brake line. Good luck.

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Sounds like the calipers are siezed, Suggest a full brake service to free them off.


Jan 24, 2009 | 1997 Ford F350 Crew Cab

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Brake rubber flex line could be collapsed,,or kinked,,,i suggest loosening of the line at the master cylinder distribution block (this will give you the ability of loosening off one line at a time,,and have some one push the brake pedal down,,if you see fluid at this point then you know it has to be the line or the caliper.
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Master cylinder won't come off 2001 F350

if its just the master cylinder then there are 2 bolts and the lines and thats it. you might have to tap it a little do to rust or because it sticks over time. if its the master cylinder and the brake booster then you will have to disconnect the booster from the brake pedal on the inside

Nov 30, 2008 | 1997 Ford F350 Crew Cab

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