# 1993 GMC Sierra 1500 - brake pedal to floor

**URL:** <https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939>\
**Category:** Maintenance/Repairs\
**Tags:** sierra1500, gmc\
**Created:** [June 29, 2022, 3:37pm UTC](https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939 "2022-06-29T15:37:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![junklady225](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@junklady225](https://community.cartalk.com/u/junklady225)\
**Post date:** [June 29, 2022, 3:37pm UTC](https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939/1 "2022-06-29T15:37:26Z")

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bjrake problems-you have brake when engine is off, turn on engine and pedal goes to floor

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**Author:** ![TheWonderful90s](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thewonderful90s/32/29584_2.png) [@TheWonderful90s](https://community.cartalk.com/u/TheWonderful90s)\
**Post date:** [June 29, 2022, 4:10pm UTC](https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939/2 "2022-06-29T16:10:29Z")

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Did you try pushing really hard with both feet with the engine off to see if you could get the brake pedal to go to the floor?

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**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\
**Post date:** [June 29, 2022, 7:45pm UTC](https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939/3 "2022-06-29T19:45:58Z")

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Probably fluid leak or bad master cylinder. Check the level of the brake fluid and go from there.

> **[Brake Pedal goes to Floor when Engine Running - Eagles Garage](https://eaglesgarage.com/brake-pedal-goes-to-floor-when-engine-running/)**
>
> A really scary image comes to mind whenever my brakes pedal goes to the floor when my car is running. It means that I am about to lose my brakes and hit something or someone.

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [June 29, 2022, 11:25pm UTC](https://community.cartalk.com/t/1993-gmc-sierra-1500-brake-pedal-to-floor/184939/4 "2022-06-29T23:25:34Z")

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Good advice above. If those don’t pan out, another idea, might be a problematic brake booster.