Re: GMC 4000...? or 5000 series....Pictures...it's about time...
Thank you for the info
Quote:
Originally Posted by factorystock
The switch is a front brake limiting valve. It reduces air pressure applied to front brakes when on the "slippery postion". I bet this truck was a short wheel base 2 axle tractor in its earlier life. It was very common for large trucks to be modified when sold to fit the need of the new owner. A power divider differential lock will say "lock" "unlock".
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