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1995 Chevy Blazer brake light

Tiny
HOPPA143
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 202,166 MILES
My brake light is on I have replaced the emergncy brake lines all the steel and rubber lines new pads and shoes with rotors and drums and master cyclinder do you know what could be causeing this problem its really fustrating I have plenty of brake pedal trying to figure out what to do
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Friday, October 29th, 2010 AT 7:10 AM

10 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That light comes on for 3 different reasons

1) Low brake fluid
2) Parking brake applied
3) Hydraulic problem in braking system
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Friday, October 29th, 2010 AT 7:48 AM
Tiny
HOPPA143
  • MEMBER
  • 4 POSTS
Master cylinder is full of fluid parking brake is not on but the hydraulic problem where do I start I have replaced the lines from the master down to the combination valve but haven touched the abs pump I have a new abs pump but have not put it in yet dont know how to bleed it or if thats even the problem
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Friday, October 29th, 2010 AT 7:57 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
If you have a good brake pedal I wouldn't even mess with the hydraulic system right now. Grab a large screwdriver, hold it by the blade and rap on the side of the master cylinder reservoir. Sometimes the float will stick when the reservoir is run real low.
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Friday, October 29th, 2010 AT 8:06 AM
Tiny
HOPPA143
  • MEMBER
  • 4 POSTS
Brand new master I bled the master and bled the whole brake system any other ideas
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Friday, October 29th, 2010 AT 8:09 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
As I stated, it's one of those 3 things. If you have a good normal brake pedal, you can pretty much eliminate the hydraulic issue. You could even have a defective sensor in the master cylinder. Try jumping out the plug.
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Friday, October 29th, 2010 AT 8:13 AM
Tiny
HOPPA143
  • MEMBER
  • 4 POSTS
How do I do that?
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Friday, October 29th, 2010 AT 8:16 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Unplug the sensor and jump the 2 wires together with a paper clip.
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Friday, October 29th, 2010 AT 8:18 AM
Tiny
HOPPA143
  • MEMBER
  • 4 POSTS
Mine only has 1 wire a purple wire that plugs into the top of the combination valve
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Friday, October 29th, 2010 AT 8:28 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Your talking about the proportioning valve and I'm talking about the low fluid sensor in the master cylinder. The proportioning valve could be stuck too. You can find out by unplugging it.
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Friday, October 29th, 2010 AT 8:31 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
One more thing we haven't covered here is the possibility that your truck has rear wheel only ABS. That system will put the brake light on when a code is present but will go out if the module is unplugged. $ Wheel ABS doesn't work that way.
It also appears that you may not have a low fluid sensor in that model.
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Friday, October 29th, 2010 AT 8:52 AM

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