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Brake pedal goes almost to the floor in normal braking

Tiny
BOBSONLY
  • MEMBER
  • 2000 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 276,000 MILES
Replaced all brake components including the master cylinder and bled all M/C and brakes. Brake pedal goes almost to the floor in normal braking, but when doing a panic stop the pedal goes to the floor and total braking power is not achieved. Don't know if it's the Brake Pressure Modulator Valve or the Electronic Brake control Module, and no warning indicators light up on the dash.
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Wednesday, April 19th, 2017 AT 8:20 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
We see this a lot and you can try using a power bleeder to fix it and if that doesn't then a mechanic will have to use a scanner to open all valves on abs unit to bleed system and that normally takes care of it.
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
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  • MEMBER
  • 3 POSTS
Thank you for your reply. This I will take care of through a dealership as there are only two mechanics shop in town and they don't have scanners or power bleeders available. Thank you again.
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Rent it shops normally carry those
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Wednesday, April 14th, 2021 AT 1:36 PM

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