Question about Mercury Cars & Trucks
Started out with just the lights coming on. now when i apply the brakes they feel like they are slipping. This morning it was hard to push the brake pedal and I had to pump it several times. did this about 4 times when I tried to stop and now they seem fine?
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Posted on Jan 02, 2017
I agree with the post about the tail lights. And the symptom about the brakes on when starting was also helpful. When I took off my rear tail lights and removed the top light bulb (top of the 4 is closest to connector) then repeat starting the car the problem is gone. I have a whole drawer of these bulbs that I removed, not because the filament was burned out, but because the base (similar to circuit card edge connector) had heat damage and melted. I am not sure exactly what the problem is but I think there are multiple conductors in the fixture which are too close or get moisture shorts. Anyway I hypothesize the circuit for daytime running lights is leaking current into the brake light circuit, and it causes that module that controls traction control and ABS to declare a fault. When you start with foot on the brakes the brake lamp is pulled on (I don't know if switches hi or lo) so that module doesn't declare the fault until you release the brakes.
I put in new bulbs and it works fine for now, but I know it may reappear some day then I will repeat, disassembly of the fixtures and inspect bulb bases for heat damage and clean out and replace. That is what did the trick for me.
Thanks Fixya and all contributors
Posted on Feb 07, 2009
You have a bad sensor at one of the tires that need replacing that operates ABS and traction control. If you take it in to a shop it will run $130 but they can find which sensor is causing the problem. But if you do it you might have to replace all 4 sensors to make sure you got the right one. Every hard to diagnoses. Its better for the shop cause they can get electrical read outs for each sensor.
Posted on May 21, 2009
i had the same problem on my 2000 montana, used a scanner to check for abs code and found right front sensor throwing code, checked sensor and found ok, checked harness from sensor to connection under hood and found wiring circut at the plastic clip where harness hooks to sensor was bad, replaced harness from connector to sensor and problem went away
Posted on Jun 17, 2009
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