Brake and ABS LIght
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Brake and ABS LIght
Hi all, new to forum looking for a little help. I did oil and fuel filter service on my 1997 F250 7.2 for the first time and like a knuckle head I let the fuel drain down to a pan under truck without directing it to a container. Next day brake and ABS lights are on continuously. Just had new master cylinder installed. I don't believe to much in coincidence so I assume the diesel fuel contaminated a sensor. Not sure where to look for ABS sensor since it's tough to find a good service manual for this truck. Everything works normally except of course the cruise control.
Post Fiend
Joined: Dec 2010
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From: Orrville, Ohio
Welcome to the site aduckfan!
Honestly I don't think that anything you did in draining the fuel has a bit to do with the issue you're seeing. These trucks only really use one sensor for the ABS and it is on the rear differential (far out of the reach of any fluids you were draining). Check the brake fluid level. I bet it is low.
If it isn't the fluid level, then my next question would be, does your speedometer work? If the sensor on the rear end is out (VSS -- Vehicle Speed Sensor) the ABS won't work, but neither will the speedometer, or it may bounce wildly, and if you have an automatic transmission, it may not shift right.
Honestly I don't think that anything you did in draining the fuel has a bit to do with the issue you're seeing. These trucks only really use one sensor for the ABS and it is on the rear differential (far out of the reach of any fluids you were draining). Check the brake fluid level. I bet it is low.
If it isn't the fluid level, then my next question would be, does your speedometer work? If the sensor on the rear end is out (VSS -- Vehicle Speed Sensor) the ABS won't work, but neither will the speedometer, or it may bounce wildly, and if you have an automatic transmission, it may not shift right.
Post Fiend
Joined: Dec 2010
Posts: 10,121
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From: Orrville, Ohio
There is a pretty good chance that the burned out bulb is causing your issue. I take it you already checked the brake fluid level?
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Sorry about the delay responding. Fixing the light fixed the problem. Was an adventure getting to it but worth the effort getting cruise control back. Thanks again I don't understand the relationship but I guess it's a good idea telling me I'm either low on brake fluid or a light out. Hope this helps others.
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Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
I'm glad that fixed it for you. The issue is that Ford uses the tail light path as a signal path for the ABS, Cruise Control and Torque Converter lockup. If there is a burned out lamp, it interrupts the signal path and causes issues with things. Kinda screwy, but that's the way they designed it to work.
At any rate, I'm glad that fixed it for you.
At any rate, I'm glad that fixed it for you.
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