99 2500 TD 4X4 Brakes grab

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dspencer77 - 14 Jun 2005 22:41 GMT

Have a braking problem with my truck and hope someone can help. When I step
on the brake pedal the brakes grab. I barely have to push on the pedal and
it feels like the rear brakes grab and sometimes the tires lockup. The
truck has rear antilock, I have no antilock light on. It's almost as if
there is too much residual pressure in the lines to the rear brakes or
something is not letting the pressure release. I noticed this started
happenng after I had to make a panic stop while towing my 5th wheel
camper.

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Henry - 14 Jun 2005 23:40 GMT

moisture in system,,,,just an thought.

Henry

> Have a braking problem with my truck and hope someone can help. When I
> step
[quoted text clipped - 5 lines]
> happenng after I had to make a panic stop while towing my 5th wheel
> camper.

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Tom Lawrence - 15 Jun 2005 00:41 GMT

> something is not letting the pressure release. I noticed this started
> happenng after I had to make a panic stop while towing my 5th wheel
> camper.

Check and see if something got bent or otherwise fouled with your
load-sensing proportioning valve - it's a valve hanging from the driver's
side frame rail, back by the rear axle. The lower the truck squats, the
more the arm of the valve rotates, and allows more fluid pressure to the
rear brakes.

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Nosey - 15 Jun 2005 18:17 GMT

> Have a braking problem with my truck and hope someone can help. When
> I step on the brake pedal the brakes grab. I barely have to push on
[quoted text clipped - 4 lines]
> release. I noticed this started happenng after I had to make a panic
> stop while towing my 5th wheel camper.

Pull the rear wheels & drums and check for a leaking axle seal or leaking
wheel (brake) cylinder. Either of these will give you the symptoms you
describe. I've had one of each go bad on my '99 2500 TD 4X4 so far.

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