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Re: GMC 4000...? or 5000 series....Pictures...it's about time...
Quote:
Originally Posted by Captainfab
That is for manual operation of the trailer brakes......it's air brake specific.
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Right, also known as a "Trolley" brake.
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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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