Question about Pontiac Trans Sport

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When you brake and the van is near a complete stop the brakes let go a little then kick in hard. Sounds almost like when you start the vehicle and the ABS light goes out

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  • fire119 Sep 23, 2008

    At times when I am driving and I go to brake, it is as if the ABS is kicking in (I hear a rattling noise), but the car will not stop. The brake pedal goes all the way down to the floor. At that point, either the brakes finally kick in or I need to take my foot off the pedal and then re-apply the brakes. I have changed the brake pump, sensors and the ABS relay, but still the same issue.



    Thanks Vinny

  • sue041203 Jan 21, 2009

    I am experiencing the same problems with my ABS. The light doesn't always stay on and when it turns on while applying the break it feels almost like im hydroplaning and if i lift my foot off brake and reapply it seems to work fine???

  • macemcadams May 08, 2009

    I have the same problem and it's usually in the morning or getting in the car after it sits for hours. I go to brake and it rattles, the pedal goes to the floor, then graps semi-violently, then stops. No ABS light or code lights up. Helps if I let off and then reapply. Was wondering if this was an ABS sensor. Lately I've been trying to pump the brakes before I leave the garage. Seems to help so far.

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Hi Chelsea, This indicates a problem with the ABS. However, this symptom could indicate a problem with the battery, battery cables, or battery connections.
1. Even if you don't have any apparent starting/charging problems, check out the battery cables to make sure all connections are clean and secure.
2. The next step, if not obvious, is to check the brake pads and shoes to make sure there is no problem with them.
3. If the van tends to "roar" at speed, you may have a wheel bearing problem. This can also throw off the ABS Sensor alignment at the affected wheel, and cause the issue you're describing. The front wheel bearings are supplied as "hub units" and require slightly more tools and knowhow to replace than the standard shade-tree mechanic stuff. Stop by a real parts store, order up the Chilton manual for your van and check it out.
After those 3 items, you may need to have a professional mechanic check it out.

Posted on Jul 26, 2009

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As I already knew one of my rear wheel bearings was going, ie lots of noise above 60km, vehicle has 250K KMs, I read my service manual and it indicated most probable one of the bearings reading zero under 5 KM per hr causing full pressure by the ABS to be exerted on the rear brakes. Works fine with the ABS cct breaker pulled. Solid brakes with ABS above 5 km/hr. No ABS light on, do not have an ABS code reader only the basic GM code reader. Vehicle is 1992. Thanks Anyway

Posted on Jul 22, 2008

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