Question about 1997 Ford F350 Crew Cab

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Hi, I have a 1997 Ford F-350 diesel and the brake

Hi, I have a 1997 Ford F-350 diesel and the brake light came on when I pushed the brake pedal while I was driving, it then went out a few seconds later and kept coming on everytime I pushed the brake pedal and then going off until eventually it just stayed on (after about an hour). The brake pads are good and the fluid is fine, there are no leaks coming from the rear drum brake cylinders. It will stop with great force on the brake pedal. Is the vacuum pump bad? or do you think it may be the master cylinder? I know it sounds bad that I drove it for awhile with weak brakes but I did not have a choice at the time! Thank You.

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Common problem! replace the brake booster! and vacuum pump!

Posted on Jun 02, 2010


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If the truck has the 7.3L diesel, it will have a vacuum pump which supplies vacuum for all vacuum accessories. I believe if the vacuum level drops below 10 in. of Hg, the brake light will illuminate. If the vacuum pump fails you'll know it as the brake pedal will require quite a bit of effort to effect any braking effort.

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