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ABS and brake light on when cold only

Tiny
KEN RICHARDSON
  • MEMBER
  • 2000 FORD F-150
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 180 MILES
When temperatures are cold, both lights come on, and remain on until vehicle warms up. Once vehicle is warm, or when outside temperature is warm, lights do not come on and remain, but work properly. What could cause such behavior? Thanks, Ken
Tuesday, December 4th, 2018 AT 6:50 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

This may be one of the sensor. When it gets hot, they will expand which means the air gap may change to where it should be located.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Did you have the codes checked? This would help narrow the area that is setting the code.

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

Roy
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Saturday, March 13th, 2021 AT 12:05 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
I have had rear differential speed sensors do this before. Pretty cheap to replace, if it has not been done already anyways.
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Saturday, March 13th, 2021 AT 12:05 PM

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