12 Bolt Drum Brake Upgrade - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aotte1** · 12-25-2015, 01:22 PM

Researching is it possible to upgrade early ( 2" shoes) 12 bolt drum brakes to the newer heavy duty brakes ( JB 5 brake option) found on later 12 bolts. Believe, the backing plates would need to be changes out. Specifications for 1979 K10, with the JB5 option for 12 bolts were provided to me by member Keith Seymore, below. Thanks Keith. Thinking of using the '79 specifications, because the front axle will be a '79 Dana 44 with the heavy duty/JB5 brake option. A more general question previously on 12 bolt brakes, has been asked in the 67 to 72 forum, by Lostmy65 in an older thread..

Les

12-25-2015, 01:22 PM	#1
aotte1 Senior Member Join Date: Oct 2013 Location: lousiville Ky Posts: 2,637	12 Bolt Drum Brake Upgrade Researching is it possible to upgrade early ( 2" shoes) 12 bolt drum brakes to the newer heavy duty brakes ( JB 5 brake option) found on later 12 bolts. Believe, the backing plates would need to be changes out. Specifications for 1979 K10, with the JB5 option for 12 bolts were provided to me by member Keith Seymore, below. Thanks Keith. Thinking of using the '79 specifications, because the front axle will be a '79 Dana 44 with the heavy duty/JB5 brake option. A more general question previously on 12 bolt brakes, has been asked in the 67 to 72 forum, by Lostmy65 in an older thread.. Les Last edited by aotte1; 12-25-2015 at 01:43 PM. Reason: EDIT



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