Brake booster question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LeesTruk · 07-24-2016, 02:05 PM

I'd like to replace the booster on my C10 (1980). It looks as if at one time a m/c had leaked and was replaced by the previous owner. My dilemma is this. There is no SPID on the glove box door (or anywhere). I have the big 1.25" rotors, 2" brake shoes, and a single diaphragm booster. I'm assuming that's a JB3 setup? I'd like to go to the dual diaphragm booster and am wondering if the two boosters are interchangeable? Thanks

07-24-2016, 02:05 PM	#1
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Brake booster question I'd like to replace the booster on my C10 (1980). It looks as if at one time a m/c had leaked and was replaced by the previous owner. My dilemma is this. There is no SPID on the glove box door (or anywhere). I have the big 1.25" rotors, 2" brake shoes, and a single diaphragm booster. I'm assuming that's a JB3 setup? I'd like to go to the dual diaphragm booster and am wondering if the two boosters are interchangeable? Thanks

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