Question about GMC Safari

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Anti lock kicks in during dry driving operations. I took the rotors off last night and cleaned them up. I also sprayed brake cleaner on front sensors to clean them up as well. No anti lock lights are coming on. Are there rear sensors? What else could this be? Thanks.

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  • edonker Jul 17, 2009

    I pulled the ABS fuse and did a road test. Brakes work fine. Do you know if there are rear ABS sensors on this vehicle? I pulled the rear wheels and looked around but didnt see any wiring or anything, all I saw was the brake line and the E brake cable. Thanks for the help.

  • edonker Jul 17, 2009

    Wouldnt the ABS light come on if there were trouble codes stored?

  • edonker Jul 17, 2009

    Are there rear wheel speed sonsors on this vehicle?

  • edonker Jul 21, 2009

    I appreciate the picture. This works nice to point me in the right direction for the front wheels, however, this still leaves me wondering what the rear wheel sensors look like or if it even has them. The rear axle on the van has drum brakes. More info please.

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The antilock brake device is on the differential you will see it on the front and will have a sensor on the axle. and a magnet on the drive line. if the front is coming on then it means your rear brakes are not working, this is normally caused by the hydraulic limit switch is mal functioning, and anti lock brakes are always on even in dry weather, if you slam on the brakes with two wheels on the pavement and two in the gravel you will drive straight as the anti lock brakes are working. On the rear axle there is a proportioning valve that controls how much braking power is applied to the rear brakes. if it's defective it will make it seem as the front brakes are only working. to test this unhook the arm from the chassis and open the valve wide open and try the brakes if the braking is even from front to rear then the proportioning valve is defective so eathier adjust it or replace it.

Posted on Jul 21, 2009

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The ABS sensors are on all 4 wheels.
The sensors are rigid mounted - and use a commutator ring (a.k.a. Reluctor ring a.k.a. ABS ring)
These rings are pressed onto the axles and are prone to cracking during service.
Remove the wheels and look for damaged teeth or missing sensors.

Reluctor ring
Anti lock kicks in during - 121f836.jpg
583f92a.jpg


ABS sensor (#3)


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Posted on Jul 18, 2009

  • blueextc3221
    blueextc3221 Jul 24, 2009

    ABS systems REQUIRE information from all 4 wheels to determine slippage.
    There are sensors on all 4 wheels.

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Have you had it scanned for Diagnostic Trouble Codes? It could be anything from a bad Wheel Speed Sensor to a bad ABS Control Module. You need to get the stored trouble codes for the exact problem go to auto zone they will most likely have a code reader and do this for free and sell you the parts needed

GOOD LUCK TO YOU

Posted on Jul 17, 2009

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There are sensors at the hub/rotor of the car which can be sending the wrong signal to the ABS computer. I would like to suggest to deactivate the ABS and see if it is not the actual breaking system that you are having issues by removing the ABS module. If you still have the issues without it you may want to check for contaminants in the fluid and other components. It would be great if you have a spare ABS module to test if it is the module you are having issues with or the sensors on the wheels. It would also be a good idea to check the wiring to the module to make sure.

Posted on Jul 17, 2009

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