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ABS Problem

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Posted by: White Line-Nightmare

Hi,

I have a problem with the ABS system on my-89 Lincoln Mark 7 LSC. My ABS pump motor or accumulator comes on when i turn the car off and drains my battery over night.I have had to disconnect the neg cable from the battery to prevent this/reset computer.the red brake and ABS lights will come on when im driveing. i have read the outher ABS post and im gessing i will have to replace the accumlator,pressure switch and motor relay.any idea in how much this might cost with labor? Please help me.

Posted by: JoshMcMadMac

First thing I would suggest is to flush the brake system. I had a similar problem that occured when the weather got cold and humid, and the fresh brake fluid fixed that issue. See this: http://www.lincolnsonline.com/article21.html

Posted by: pepperman

Quote:

Originally Posted by White Line-Nightmare

Hi,

I have a problem with the ABS system on my-89 Lincoln Mark 7 LSC. My ABS pump motor or accumulator comes on when i turn the car off and drains my battery over night.I have had to disconnect the neg cable from the battery to prevent this/reset computer.the red brake and ABS lights will come on when im driveing. i have read the outher ABS post and im gessing i will have to replace the accumlator,pressure switch and motor relay.any idea in how much this might cost with labor? Please help me.

A guy by the name of oldschool1 is a Mark VII guru if he sees this thread he is the one who can help you.

Posted by: White Line-Nightmare

Well i hope he does see this thread to.the brakes were bleed about 6 months ago when the rear pads were replaced,the fluid looks good but i gess i could flush it.Thanks for the Welcome,Im glad to be here.i think im the only one in my area(Martinsburg,WV) who has a Mark 7 LSC.

Posted by: OldSchool1

Quote:

Originally Posted by White Line-Nightmare

...
i think im the only one in my area(Martinsburg,WV) who has a Mark 7 LSC.

Think again .. we're EVERYWHERE

It takes at least a gallon to do the complete brake fluid flush.

Our pumps should stop running once the sytstem is up to pressure. Buy or borrow a code reader and pull brake system codes. It's easier to fix if you know what's broken.

Brake relays are cheap and easy to replace.

Accumulators are expensive but hey ... your current accumulator lasted 16 years. We should be so lucky to own these cars sixteen years from now. There'sa good article on this at http://www.lscclub.org/tech/brakeAccumulator.htm

Charge yourself $25.00 per hour for four hours labor for the brake bleed and the accumulator replacement and also $300.00 for fluids, oil dry, hoses, containers, and the accumulator for a total of about $400.00

double that amount and have the shop down the street do it and give you a 12 month warranty on parts and labor.

Lastly, thanks for the props guys buy there are a LOT of guys with more knowledge and hands on that I have. I just happened to be a Mark VII owner since 1992 and now have like five of these cars.

If I can help I'll chime in

Posted by: White Line-Nightmare

Well i bought the accumlator=$284.14 with tax.thats a LOT of money! but i have one concern-what could cause the pump motor/accumlator to run with the car off and drain my battery? any ideas would be helpfull.

Posted by: ND4SPDLSC

I think the relay is stuck. The ABS generates codes if it's an '88+ if I remember right. There should be two relays on the firewall. If you tap on them and the motor shuts off, then it's probably a relay.

A bad accumulator will result in a hard brake pedal on or off the road and a light should come on in the dash. Right now, I think you just have a relay problem.

Posted by: White Line-Nightmare

well the accumlator was but on today and seems to have fixed the problem.also plan to have the system flushed.I will prob. replace the relay anyway but there are two relays under the cover behind the master clinder,which one is for the ABS system? also Thanks to all who helped he out.

Posted by: JoshMcMadMac

Quote:

Originally Posted by White Line-Nightmare

...but i have one concern-what could cause the pump motor/accumlator to run with the car off and drain my battery? any ideas would be helpfull.

The brake system is designed to function at a very high pressure. The accumulator helps in this process. Applying the brakes uses this pressure, so the system is designed to repressurize itself after you use it. If the system is not capable of creating the level of pressure it is designed to reach, the system will continue to run in an attempt to reach that pressure. Since that pressure is never reached, it continues to run, eventually killing the battery.

Posted by: White Line-Nightmare

"The brake system is designed to function at a very high pressure. The accumulator helps in this process. Applying the brakes uses this pressure, so the system is designed to repressurize itself after you use it. If the system is not capable of creating the level of pressure it is designed to reach, the system will continue to run in an attempt to reach that pressure. Since that pressure is never reached, it continues to run, eventually killing the battery."

I see,that makes sense<Thank you Josh and all outhers who helped me with this problem.

Posted by: JoshMcMadMac

Quote:

Originally Posted by White Line-Nightmare

I see,that makes sense<Thank you Josh and all outhers who helped me with this problem.

That's what we do and why I personally am here. Glad to help.

Posted by: OldSchool1

Quote:

Originally Posted by White Line-Nightmare

...
I see,that makes sense<Thank you Josh and all outhers who helped me with this problem.

You're welcome.
I just want to know if you charged yourself $25.00 per hour for labor