97 f350 BRAKE HELP! - Ford Powerstroke Diesel Forum
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  #1  
Old 01-27-2008, 12:48 PM
gwh gwh is offline
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97 f350 BRAKE HELP!

1997 F350 WITH HARD BRAKE PEDEAL NO BRAKES. REPLACED POWER BOOSTER.NO HELP. REPLACED VACUME PUMP.HELPED BUT STILL NO BRAKING.CHECKED FRONT AND REAR BRAKES AND CALIPERS ALL GOOD. CHECKED ABS CODES NONE(16 BLINKES). REPLACED MASTER CYLINDER. HELPED JUST NOT ANOUGH. IT FEELS LIKE HAVE ABOUT 3/4 BRAKES. JUST NOT ALL THERE.
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  #2  
Old 01-28-2008, 07:58 AM
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have you checked to make sure you have vaccum to the brake booster? I've had the vaccum pump go bad on a '95 I had and had similar brake issues.
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Old 01-28-2008, 06:47 PM
gwh gwh is offline
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yes have vacume to the booster.
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Old 01-28-2008, 07:50 PM
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i know this might sound like a stupid question but did you bleed them ?
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Old 01-28-2008, 10:38 PM
gwh gwh is offline
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yes, three times and two quarts of brake fuild. flushed the system.
thanks for the post.
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Old 01-29-2008, 01:55 AM
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It's probably your vacuum pump. Commonly on floored pedal means master cylinder, a hard pedal is usually the brake booster. But on a ford the vacuum pump could also cause the hard pedal as well
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Old 01-29-2008, 04:25 PM
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Make sure the brake pressure switch isn't leaking. It's on the front of the master cylinder if you have cruise. Pull the wire plug and look for fluid.
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Old 01-29-2008, 08:12 PM
gwh gwh is offline
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I DID NOT SEE ANY FUILD THERE ON THE OLD MASTER CYILNDER WHEN I REPLAED IT WITH A NEW ONE.
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Old 01-29-2008, 08:16 PM
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If you have a hard pedal it could be that one or more of your calipers are locked up. Did you check them? I know that they tend to freeze up on the slide pins. I actually had the same prob. on my '99 and just replaced all of the slide pins, and problem solved. Plus it's a cheaper "guess" than replacing boosters and the like.
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Old 01-30-2008, 08:12 PM
gwh gwh is offline
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I inspected the calipers and checked the pistons. The pistons check out okay. I will reinspect the cailpers and pay more attention to the slide pins. What should I look for at the slide pins?

THANKS
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