Brake Light Illuminated - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67RS/SSx2 · 01-02-2011, 07:46 PM

1971 C10 with power dics. What can cause the brake light to illuminate? Is it brake pedal travel or other?

Have to pump the brakes to get the truck to stop. Not my truck. I'm trying to determine what to look at first, second, etc.

Thanks!

cdowns · 01-02-2011, 08:12 PM

leak in system or failing master cylinder/ check fluid level

67RS/SSx2 · 01-02-2011, 09:50 PM

Thanks. The owner thought it might be because he has a cam with a lot of duration giving him very low (5") vacuum. I think that would only cause him to lose the power assist like when the engine is not running on a car with power brakes and the brakes are very hard.

Longhorn Man · 01-03-2011, 12:40 AM

air in the lines.
The pumping the pedal also points this direction.

67RS/SSx2 · 01-03-2011, 08:56 PM

Thanks! Now i know where to start.

01-02-2011, 07:46 PM	#1
67RS/SSx2 Registered User Join Date: Sep 2010 Location: Central Oklahoma Posts: 253	Brake Light Illuminated 1971 C10 with power dics. What can cause the brake light to illuminate? Is it brake pedal travel or other? Have to pump the brakes to get the truck to stop. Not my truck. I'm trying to determine what to look at first, second, etc. Thanks!

01-02-2011, 08:12 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Brake Light Illuminated leak in system or failing master cylinder/ check fluid level __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-02-2011, 09:50 PM	#3
67RS/SSx2 Registered User Join Date: Sep 2010 Location: Central Oklahoma Posts: 253	Re: Brake Light Illuminated Thanks. The owner thought it might be because he has a cam with a lot of duration giving him very low (5") vacuum. I think that would only cause him to lose the power assist like when the engine is not running on a car with power brakes and the brakes are very hard.

01-03-2011, 12:40 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Brake Light Illuminated air in the lines. The pumping the pedal also points this direction.

01-03-2011, 08:56 PM	#5
67RS/SSx2 Registered User Join Date: Sep 2010 Location: Central Oklahoma Posts: 253	Re: Brake Light Illuminated Thanks! Now i know where to start.



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