Which are the bigger pistoned calipers? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

El Campo · 08-31-2012, 07:34 PM

Hey guys, swinging by from the 67-72 forum as I have a 73-87 front crossmember, drop spindles etc on my 72. My question was this: I have the HD 1.25" rotors and I am getting ready to put new calipers on. I thought I read somewhere that in the HD calipers that there were some that had larger diameter PISTONS than others. Does anyone know the application or a part number for these? Thanks !!!

clinebarger · 08-31-2012, 08:19 PM

My 85 C20 Suburban has 12.5" x 1.28" rotors, The Caliper pistons are bigger than a C10 piston.....3.15" vs 2.94".

Tell the part store you have a 85 C20 with a "JB7" brake system.

El Campo · 08-31-2012, 09:33 PM

Thanks again clinebarger, always the helpful one!

08-31-2012, 07:34 PM	#1
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Which are the bigger pistoned calipers? Hey guys, swinging by from the 67-72 forum as I have a 73-87 front crossmember, drop spindles etc on my 72. My question was this: I have the HD 1.25" rotors and I am getting ready to put new calipers on. I thought I read somewhere that in the HD calipers that there were some that had larger diameter PISTONS than others. Does anyone know the application or a part number for these? Thanks !!! __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

08-31-2012, 08:19 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Which are the bigger pistoned calipers? My 85 C20 Suburban has 12.5" x 1.28" rotors, The Caliper pistons are bigger than a C10 piston.....3.15" vs 2.94". Tell the part store you have a 85 C20 with a "JB7" brake system.

08-31-2012, 09:33 PM	#3
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Re: Which are the bigger pistoned calipers? Thanks again clinebarger, always the helpful one! __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!



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