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1993 Mercury Sable Question: ANTI LOCK light on mostly despite new rear including rotors,hoses.Front excellnt

 

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seansteven, New York, NY, July 06, 2012, 07:10
 Rookie

The brake fluid is full. The anti lock light at times is off for a lengthy drive and then when lightly braking I hear a fart-like groan and the light pops on. The brakes operate perfectly for any kind of stop. Cold damp weather seems best for the problem. I ve heard about the possibility of air in the lines. How is that checked and solved ?? My mechanic says that its not unsafe.(The antilock pump replacement would be too costly a fix for me and I have an inspection coming up by the end of July)
Please help!!
Thanks,
Stephen

2 Answers
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  • Answer #1

    pushrod July 06, 2012, 21:59
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     Master

    Have your wheel speed sensors checked with a pro. scaner that can monitor
    wheel speed. If one of these sensors drops out then there's your problem.

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    seansteven, July 07, 2012, 09:20
     Rookie

    Thanks so much for your response. I will have that checked but I have another question. I don't have to be driving for the anti lock light to come on. Typically the light is already on when I start the car and it stays on. Sometimes the light is off and I can drive for a while before it comes on or I can drive on the highway for 120 miles and it never comes on for that trip but will come on again at some point on my return trip home the next day. ( In this instance would the "wheel speed " sensor possibility still be the reason ???)
    Thanks again, I should have elaborated about this experience when I asked the original question.
    Stephen

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    pushrod, July 07, 2012, 09:40
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     Master

    Same answer anyone with a decent scanner with data stream should
    be able to pull the code/codes and tell what the problem is.Be SURE to
    check the connection at the suspected sensor. Bad connections are common.

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    pushrod, July 07, 2012, 09:47
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     Master

    Same answer anyone with a decent scanner with data stream should
    be able to pull the code/codes and tell what the problem is.Be SURE to
    check the connection at the suspected sensor. Bad connections are common.
    This isn't the only thing that could be your problem.It's just one that i have
    had a lot in the shop. Good luck.

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  • Answer #2

    ziptie12 July 26, 2012, 17:37
     Master

    FIRST YOUR MECHANIC IS CORRECT. THE ANTI-LOCK BRAKES EVEN THOUGH TIED TO THE REGULAR BRAKE SYSTEM IS STILL INDEPENDANT FROM IT. If the ABS system fails your standard brakes still operate normally.HOWEVER if you have an hydraulic failure the RED brake warning light will come on and by default disable the ABS turning on the AMBER ABS light (RED_CRITICAL-AMBER_ CAUTION). From your description ,the pump comes on briefly for it's self-check and sees a fault , turns the light on and disables the system. You already answered yourself---"the brakes operate perfectly for any kind of stop". CHECK NY INSPECTION LAWS. In Va. the amber light on, passes safety inspection , the red does not. If your lucky it's the same there.

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