Brake warning lamp issue

[KICK]

have a 93 GMC 1500,when driving truck the brake warning lamp in dash will come on and stay on as soon as the truck passes about 36 mph.

 

the light self checks properly when you start the vehicle and will stay out when you first start the truck, you can operate the truck at low speeds and light will not come on, as you accelerate thru the gears ( its an automatic) the brake light warning lamp will come on as soon as the speed passes about 36-37 mph.

 

it does it whether its in 2, Drive or OD positions.

 

Wierd?

[KICK]

have a 93 GMC 1500,when driving truck the brake warning lamp in dash will come on and stay on as soon as the truck passes about 36 mph.

 

the light self checks properly when you start the vehicle and will stay out when you first start the truck, you can operate the truck at low speeds and light will not come on, as you accelerate thru the gears ( its an automatic) the brake light warning lamp will come on as soon as the speed passes about 36-37 mph.

 

it does it whether its in 2, Drive or OD positions.

 

Wierd?

 

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I GUESS THE REST OF U R CLUELESS 2!