# ABS and Brake Light comes on when outside temps is over 85 degrees

**URL:** <https://community.cartalk.com/t/abs-and-brake-light-comes-on-when-outside-temps-is-over-85-degrees/2935>\
**Category:** Maintenance/Repairs\
**Created:** [August 11, 2007, 1:35pm UTC](https://community.cartalk.com/t/abs-and-brake-light-comes-on-when-outside-temps-is-over-85-degrees/2935 "2007-08-11T13:35:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Towandabme](https://avatars.discourse-cdn.com/v4/letter/t/47e85d/32.png) [@Towandabme](https://community.cartalk.com/u/Towandabme)\
**Post date:** [August 11, 2007, 1:35pm UTC](https://community.cartalk.com/t/abs-and-brake-light-comes-on-when-outside-temps-is-over-85-degrees/2935/1 "2007-08-11T13:35:44Z")

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I have a 2003 Chevy Silverado. Every time the truck sits outside and the tempeture reaches 85 degrees, the ABS and Break Lights on the dash will remain on when I start the truck. I still have brakes. What’s strange is if I have the A/C on, the two lights will eventually go out when the interior is cooled down. Everytime I took it in to see if it was the sensor, the truck would not do it. So am I crazy? Or is the truck playing a practical joke on me?

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [August 11, 2007, 2:24pm UTC](https://community.cartalk.com/t/abs-and-brake-light-comes-on-when-outside-temps-is-over-85-degrees/2935/2 "2007-08-11T14:24:55Z")

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My guess is the parking brake switch.