Brake Warning light on '83 K2500

[Bob Q]

While coming to a stop the other day in my '83 K2500, the brake warning light came on the dash. When the light came on, I felt something odd in the brake peddle almost like the proportioning valve popped out of center so I let off the brake and pressed it again and the light went off. I thought this was a little weird, but it never did it again that day. A day or so later, while coming to stops, it did the same thing as before; the warning light came on and it felt like the valve popped out of center again. Each time it does this, I can let off the peddle and step on it again and the light goes out and the brakes feel normal. So, I thought it may have had air in the lines so I bled all four corners and never got any air out; everything seemed ok. The master cylinder never loses any fluid and I don't see signs of leakage at any of the brakes. Also, the brake peddle doesn't bleed down (like a bad master cylinder). Any suggestions? Could it possibly be a bad proportioning/combination valve?

Thanks.

[Bob Q]

Any ideas?

Thanks.

[Liberty]

Isn't that brake light only for when the parking brake is engaged?

[Bob Q]

It's for both the parking brake and the proportioning valve to let you know when it's out of center.
Posted via Mobile Device