Question about 1992 Buick Roadmaster

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Braking problem when the road is Slick

When coming to a stop in slick roads the rear wheels contiue to push the car forward even though I have the brakes fully engaged. Over a year ago I replaced the transmission and ever since I have had this problem.

I don't know if it is a problem with the Transmission not disengaging or if it is a problem with the rear brakes not engaging.

In any event it creates a very dangerous situation, as it did this morning when the car pushed itself all the way through a icy intersection.

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  • JOHN Martin
    JOHN Martin Dec 01, 2008

    It did have an ABS system but that also has not worked since the transmission was replaced. Perhaps this is the source of the problem. If it is what should I be looking for.



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I would try first to separate the two potential problem sources by (in a safe place and on a slippery surface or sand) bringing the car to a stop, then pressing firmly on the brake and then following that with pressure on the gas pedal.
With someone watching the rear wheels, see if they are attempting to turn even though the brakes are applied.
No doubt that the transmission should be disengaging but it sounds to me as if the rear wheels are not braking at all.
I don't know if your car is so equipped but it was fairly common before the era of ABS systems that there was a regulator in the line servicing the rear brakes, some sensitive to the level (loading) of the car, others to the applied pressure and still others with both capabilities. The purpose of this system was to prevent the lock-up of the rear wheels.
This regulator was passive and self-contained and rarely caused problems at all, but since they can control the pressure applied to the rear brakes, they might be capable of malfunctioning.   

Posted on Dec 01, 2008

  • Steve Allison
    Steve Allison Dec 01, 2008

    I suspected that it would have ABS and the people who did the transmission for you owe you the ABS work; hope it hasn't been too long since that happened.

    With that knowledge, I believe they have either destroyed a cable or left a connector undone since ABS is an electrical system in its operation and the monitoring it does to modulate power to the wheels during braking.
    It compares the rotational speed of each wheel with sensors to determine where the braking power should be shifted so that wheel lockup does not occur. 



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