Question about 2004 Mercury Montery

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At highway speeds brake warning lights come on

Upon reaching 60 mph my 2004 mercury monterey's abs and e brake light on the dash lights up momentarily . it has done this to me about 3 times now

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Might be a wheel speed sensor

Posted on Apr 19, 2010

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What is the ABS system?


the ABS is anti brake skid which is designed to stop wheel lock up under brakes and allow steering control at all times
it was originally designed for aircraft to stop the under carriage from being ripped from the plane when the wheels (under brakes on landing ) hit a wet patch , snow or ice on the runway
it works by each wheel having a segmented sender that is read by a sensor and this impulse switches on valves in the electric pump in the hydraulic system so that when the wheel stops turning ,brake pressure to that wheel is released momentarily and then reapplied when the wheel turns again
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you should now be having the fault codes read to find the reason for the light and have it repaired as in some systems ,if the repairs are not effected then the vehicle is put into limp mode by the ECM and that reduces the power available and the speed of the vehicle.

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ABS Light Stays On


Since you replaced the pick up units or sensors, check the tone rings on the axle shafts. The tone rings is what the sensors detect and are located at each wheel that has ABS. A tone ring looks like this:

1_3_2013_9_47_55_pm.jpg
This tone ring is on a Ford Ranger - which is pretty much the same as your Mointaineer. Notice the break in the tone ring. This will cause an ABS Fault indicator and will need to be replaced to extinguish the lamp. Check the brake fluid level and top off if needed.


Try another AutoZone or similiar to get a code and be non-specific about the light - just say a light came on on the dash and you don't know what it is about.

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look under the truck at the ****** and check the wiring to the sensors if good may be a bad sensor,also check the wiring and connections to the abs wheel sensors [ located from frame to the hub behind the rotors ] the abs also acts as speed sensor if problem was with an abs sensor at the[ hub] wheel usually set the brake system to normal power brakes [if u hit brakes hard will lock up or skid wheels] with the abs light coming on if the speed sensor at ****** malfunction can and usually causes shift problems

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There are 4 wheel speed sensors, one for each wheel, have them checked. have a garage put an abs code scanner on it, if there is a code stored in the computor,it will pin point the problem.Hope this helps.

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