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2005 Cadillac DeVille Question: Brakes are locking up

 

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Brother Jim, Morganfield, KY, November 29, 2013, 06:21
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Repair shop said that the ABS brake module needed to be replaced but was going to cost $2500.00 is this right

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    G. T. Service Center (3111 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG November 29, 2013, 06:51
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    What is your symptoms, just that the brakes are locking up. Do you feel or hear a vibrating noise when you push the brake? How hard are you pushing brake for them to lock up? Just asking because the ABS module is not going to keep your brakes from working, and there would be other symptoms as well on the Cadillac if the module was bad.

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    Brother Jim, November 29, 2013, 19:41
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    When I apply the brake just lightly (not all the time)all of a sudden all my brakes lock up. It seems after the car has cooled off you can start it and the brakes won't act up for awhile. It took the tech driving it home a couple of nights before he found it when it acted up on him

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    ProfessorG, November 29, 2013, 20:27
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    I'm trying to reason this; I have had to replace many ABS modules, But not because the brakes locked up. Is there any thing like Traction control, or Stability, or even ABS light flash or come on solid? Now I have seen a Vacuum Booster cause this. The ABS will activate for reasons of sliding the tires, or if it thinks the car is out of control because of slippery conditions, even if the steering sensor is reading wrong, if it shows you're in a turn, but you are actually going straight. If the ABS pump is not running, then I would ask how is the ABS locking up the brakes. The Pump applies the pressure to engage the brakes by pumping the fluid to the brakes. I haven't driven your car, or scanned your car, but I have questions about the diagnosis.

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    Brother Jim, November 30, 2013, 04:32
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    None of the lights come on. I wasn't driving fast or turning or anything just normal every day driving

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    ProfessorG, November 30, 2013, 07:36
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    I was just telling you reasons for the ABS to respond to misinformation.

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    Brother Jim, November 30, 2013, 23:24
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    Thanks I am suppose to talk to the repair shop Monday hopefully they will tell me that it is much cheaper than they expected?

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    ProfessorG, December 01, 2013, 07:24
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    Let us know what the code are

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    Brother Jim, December 02, 2013, 11:10
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    I talked with the tech today and he said that no code was coming up so he contacted two other Cadillac dealers (techs) and they told him that (EBS?) works in synch with the ABS and they told him to that on occasion the code has not shown up for them either? I asked if replacing the ABS module was necessary and he said it was?

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    ProfessorG, December 02, 2013, 12:18
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    The description mentioned in earlier post says that I understand how it operates, just haven't heard that the pump is operating during the wheel lockup. Apparently they have their minds made up. I can't read the data to confirm the diagnosis. The Module has all the solenoids to work each brake so yes if this is the cause the module has to be replaced, might ask them to guarantee that if it still happens again after repair they will make it good.

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    Brother Jim, December 02, 2013, 19:42
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    I will and thanks for you help. They test drove the car and found the rear brakes locking up on their own. Found no external command for abs operation by ebcm as viewed on scan tool. Found unwanted bpmv activation. Found brake master cylinder cap seal torn and brake fluid contaminated. Debris observed in brake fluid. Replaced EBCM and BPMV. Performed automated test with passing results. Parts warranty for 12 months or 12,000 miles.

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