The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Can anyone explain brake differences on these trucks?

kipps · 10-16-2020, 02:49 PM

I'm mixing and matching brake components between a 1987 squarebody and a 2001-ish gmt800. Both trucks are 3/4 tons. I've been trying to figure out what diameter pistons are used on the front calipers of a 2001. RockAuto is showing 57+57 and 40+44 calipers. I've seen some evidence of a 48+48 caliper as well. The vast majority of the available calipers are the 57+57 mm size.

When are the different caliper sizes used? Are they accompanied by a change in the master cylinder size?

10-16-2020, 02:49 PM	#1
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,099	Can anyone explain brake differences on these trucks? I'm mixing and matching brake components between a 1987 squarebody and a 2001-ish gmt800. Both trucks are 3/4 tons. I've been trying to figure out what diameter pistons are used on the front calipers of a 2001. RockAuto is showing 57+57 and 40+44 calipers. I've seen some evidence of a 48+48 caliper as well. The vast majority of the available calipers are the 57+57 mm size. When are the different caliper sizes used? Are they accompanied by a change in the master cylinder size? __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!