Question about Ford F-350

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I took the cat off my super duty F350 now the truck front brakes appear to be locked on

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If you mean the catalytic converter, that could have nothing to do with brakes.
On larger trucks, like the 500 series, there is the possibility of leaks in the air brake system (air pressure keeps the brakes off), but that should not apply to an F350, even super duty.

What I would do first is determine which side if locked on.
You can tell by temperature, or by jacking up one wheel at a time.

If it is one side, you probably have a sticking caliper, which should be rebuilt. You use compressed air or grease to pop the pistons out, clean off corrosion, and reinstall with new fluid seals and dust seals, using a large C-clamp to compress. Wheel bearing is a less likely possibility.

If it is both sides, then the master cylinder or proportioning valve is retaining pressure. Make sure master cylinder rod has freeplay, return spring is working, and not internally binding.

Posted on Oct 05, 2010


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