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1973 GMC Jimmy Brake Warning Light on Dash On All The Time

Tiny
AV1ATOR
  • MEMBER
  • 1973 GMC JIMMY
  • V8
  • 4WD
  • AUTOMATIC
  • 89,000 MILES
The Red Brake Warning Light on the Dash is On all the time. The Master Cylinder and Brake Booster have been replaced. The Brakes work OK.I am certain the front brakes are working. Not sure about the rear. The owners book says that the light comes on when either the front or rear brakes aren't working. This is a well cared for WAY above average Jimmy that is in excellent condition. What makes that light on the dash come on? And what can I do to make it go off?

Thanks,

J.S. Alsobrook
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Tuesday, November 11th, 2008 AT 1:55 PM

1 Reply

Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
You need to make sure the brakes are working all the way around. It sounds like you have air in the system and need to re-bleed it. Check for a stuck proportioning valve switch or for a bad wire to it.
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Friday, November 14th, 2008 AT 9:10 PM

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