1994 CHEVY CHEYENNE 4WHEEL DRIVE INOP WHEN BRAKE SYSTEM WAR

  • Tiny
  • Roger Emerick
  • 1994 Chevrolet Cheyenne

Transmission problem
1994 Chevy Cheyenne 6 cyl Four Wheel Drive Automatic 150000 miles

I was plowing snow with my truck for ~1/2 hour, when the Brake system warning light came on, and the 4wheel drive (4WD) stopped working. The light went off after about 10 minutes, and 4 wheel drive resumed working. The transmission fluid level appeared normal. Next day I started truck and Brake system warning light stayed on for about 1/2 hour! During this time 4WD did not work. Then light went out and 4WD resumed working. I haven't started it since. Do you know what the problem is? Thank you very much. Roger

Saturday, December 27th, 2008 AT 1:02 PM

3 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

Hi Roger,

When brake warning lamp illuminates, the brake fluid level could be low or the sending switch is faulty.

For some models when this happens, it would affect the 4WD.

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Wednesday, December 31st, 2008 AT 1:44 PM
  • Tiny
  • Roger Emerick
  • Member

Turns out it was a short in the ignition switch which caused faulty operation on 1 of the 2 connectors which came off this switch. The connector which did not receive power included 4wd, heater fan, and antilock brakes. Pending correction/replacement of ignition switch, these lines were hot wired to a toggle switch. Thanks for consideration.

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Thursday, January 1st, 2009 AT 1:39 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

Hi Roger,

Thank you for the input, it is very much appreciated.

Happy New Year.

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Thursday, January 1st, 2009 AT 3:15 PM

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