ABS pump starting coming on even at the lightest touch and at low speeds?

Tiny
JOSEPH RIEMER
  • MEMBER
  • 1990 CHRYSLER IMPERIAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
In my 1990 chrysler the abs pump starting coming on even at the lightest touch and at low speeds now it comes on and stays on as soon as I turn key. There are no leaks and I bled the brakes but they still feel kinda spongy.I do have power assist but not very much because I cannot get the car to slow down fast enoughwhen im hard on the peddle. This system is the bendix style if that helps you. I heard this system was terrible and had recalls. Also I cannot find an abs scanner to borrow and im disabled and cannot afford to buy one or take car to shop. If I knew what to replace I know I can do it myself.I did inspect and clean wheel sensors. Just need to find out what is telling pump to keep running. This sucks cause we are getting a newer vehicle in two months at income tax time, figures. Please help
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Thursday, November 18th, 2010 AT 4:41 AM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
I'm sorry to hear about the troubles you're facing with your 1990 Chrysler Imperial's ABS system. Although diagnosing the issue without an ABS scanner can be challenging, there are a few steps you can take to try and narrow down the problem:

Check the ABS fuse: Locate the fuse box in your vehicle and check the ABS fuse. If the fuse is blown, it could be causing the ABS pump to run continuously. Replace the fuse if necessary, but keep in mind that a blown fuse may indicate an underlying issue that needs to be addressed.

Inspect the ABS relay: The ABS relay controls the operation of the ABS pump. Locate the relay in the fuse box and ensure it is securely seated. If it appears damaged or faulty, consider replacing it.

Check the ABS sensor connections: Ensure that the ABS sensor connectors are properly connected and free from corrosion or damage. Check the wiring leading from the ABS sensors to the main ABS control module for any signs of damage or loose connections.

ABS control module: The ABS control module could be malfunctioning and causing the ABS pump to run continuously. Unfortunately, without an ABS scanner, it's difficult to verify if the module is the problem. However, if you suspect a faulty control module, you may consider replacing it. Keep in mind that this is a more expensive component and should be considered after ruling out other potential causes.
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Thursday, November 18th, 2010 AT 4:46 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,699 POSTS
If you're sure this is the Bendix-10 system, there was a recall on it to replace the piston assembly in the master cylinder. My '93 Dynasty has that system but I never put the part in yet. Only has 4,100 miles on it! Parts involved in safety recalls are warrantied for life, at least for the original owner, so parts should still be available from the dealer.

Caradiodoc
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Thursday, November 18th, 2010 AT 4:47 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,699 POSTS
To add to the story, I thought '90 models all had the Bosch system. That is not involved in the recall. The Bendix-10 system gets its power assist from the pressurized fluid, so if there is internal leakage causing low pressure and the pump to run all the time, (common symptom with the Bendix-10 recall), you will be missing the power assist.

Caradiodoc
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Thursday, November 18th, 2010 AT 4:52 AM
Tiny
JOSEPH RIEMER
  • MEMBER
  • 4 POSTS
Its dfinatly bendix cause I see the bendix on the round metal ball that is pressurized next to the master cylinder. So are u saying because I am not the original owner I cant use the warranty?And if not when I go to junk yard should I get new booster or does it not have one in bendix style?Also I tryed pulling abs pump motor relay or pump motor fuse in engine area and it does shut of pump but I lose the little bit of power assist I had and my brakes feel like trying to use while car is not running ie;complete manual which is super hard to drive.
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Thursday, November 18th, 2010 AT 5:05 AM

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