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Lincoln Mark VII ABS pump

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Posted by: GuitarOtoko88

I was wondering if any of you guys know about the ABS in the 1988 Mark VII series. The brake motor pump in my car keeps running until the battery's drained. if any of you can give me suggestions or tips on how to fix it.

Posted by: JoshMcMadMac

Flush the brake fluid. That might do it, otherwise you need to replace the accumulator.

Posted by: GuitarOtoko88

well the accumulator is allready replaced with a new one, and the brake fluid has been flushed. still has that problem though

Posted by: BigD

You might have to change out your master cylinder.

Posted by: OldSchool1

Quote:

Originally Posted by GuitarOtoko88

well the accumulator is allready replaced with a new one, and the brake fluid has been flushed. still has that problem though

Just a little more information please.
Do both (yellow and red) of your brake warning lights work?
Was the new accumulator from Ford and never used before?
Describe "when" the pump runs. As soon as you connect the battery? Whenever you step on the brake pedal? After you turn off the car?

Our brake systems are like the largest part of our shop manuals so the diagnostic isn't really binary.

Posted by: CFH

mine looks like its leaking from under the master cylinder, im not sure where exactly but for a few months ive just been refilling it once a month or so hasnt given me much problems but i just wanna get it fixed. not sure weather to get new master cylinder or replace some washers or something.

Posted by: American Air-1

It could possibly be the relay. Allot of times you can take those old relays apart and clean the points and get them to work again. My bet is that the points are stuck.

Posted by: NYC LS8

My vote is the pressure switch.

Posted by: CFH

just got the same problem, *bump*

Posted by: mcford

I just got the same problem too. Mine started leaking, big time, when it was parked but only sometimes. I went thru 6 cans of prake parts cleaner spraying dow that whole area of the engine compartment (in, over, around and under the ABS parts) Mine turned out to be leaking form the pressure switch. I an going to try a new o-ring butit may be an internal leak that allows it to go out these holes and up/out the threads. It makes the job of removal easier if you pull the reservoir off the master. the switch takes a 1 3/8" wrench or a crescent wrench that will go that big. Make sure you bleed off all the pressure before you take the switch out! A new switch (E7SZ2C244A, from ford is still available & will run you $175+. the o-ring itself is obsolete from ford.

Posted by: OldSchool1

Nice information!
Thanks for sharing it AND the pictures!

Posted by: mcford

i also found it online last night, thru a ford parts supplier. $115!!!
http://www.trademotion.com/partlocat...FRGCGgodaUtm7Q
also found it was used in other FLM models thru 97.

Posted by: jimmyblue

I would recommend first finding the ABS pressure pump relay
and give it a whack if pump stays running key-off. If it releases
& quits, replace the relay. We've had that go bad before on ours.
If it lets the pump run flat-out you will have an overpressure
that makes it harder for seals to hold, etc.

Posted by: Rich88LSC

My vote is the relay then maybe the pressure switch.

Posted by: ridindirrty

Quote:

Originally Posted by CFH

mine looks like its leaking from under the master cylinder, im not sure where exactly but for a few months ive just been refilling it once a month or so hasnt given me much problems but i just wanna get it fixed. not sure weather to get new master cylinder or replace some washers or something.

Hi. Had the exact same problem in my '87 Blass

. Had in "intermittent" leak, would park car and come back to find a big puddle of DOT 3 on the ground. Would top it off and it might be fine (full) for 2 weeks and then, BAM!

it would blow it's load again. Put the car up on the hoist and traced the leak to the union between the pump and the pump motor. Bought a complete used master assembly and swapped out the pump/motor/accumulator as a unit

leaving the balance of my original master intact (no leaks there). Problem solved. Guessing there was an internal leak in the pump itself. The gasket in there didn't look too bad but there was some corrosion (pitting) in the vicinity of the mating surfaces. P.S. I removed the motor from the pump on the new (used) unit and used compressed air to blow all kinds of crap from inside the pump, cleaned up the mating surfaces and reinstalled the original gasket (it was fine)

. Brake performance is like new again and master is bone dry (on the outside) as it should be. Hope this helps!

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