Question about 1990 Ford F350

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Hi. I have a 1990 Ford F350 diesel UHaul with no

Hi. I have a 1990 Ford F350 diesel UHaul with no brakes. I replaced the master cylinder bleeding it first then all the lines in the suggested order. The pedal still is going to the floor! I am not seeing any leaks at the wheels and the resevoir isn't depleating. Thanks in advance for any help that you may offer. Chris

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When you replace the master cylinder, your are supposed to pump it up manually before you install it. If you don't, you'll have to sit there and pump the brake pedal a couple of thousand times as one almost microscopic air bubble at a time escapes the pressure tube and back fills with fluid. once you can push the pedal repeatedly without any bubbles escaping into the reservoir, then bleed the brakes. Starting with the farthest, usually the Right Rear and work your way up. Make sure you keep the fluid level topped off. If it sucks air once, you have to start all over.

Posted on Sep 23, 2009

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If that doesn't fix the problem then you will have to replace the brake booster. Also check your vaccum line to the brake booster it may have a small crack in it causing the problem.

Posted on Apr 09, 2010

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