Brake Question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C10Silverado79 · 03-23-2010, 09:09 AM

I was looking up prices to put new rear brakes on the truck and apparently there are 2 different size brake systems on these truck. ( 11 x 2 and 11 -5/32 x 2-3/4). Is there any way to know what size my truck has without pulling the wheel and drum off?

C10Silverado79 · 03-24-2010, 10:55 AM

bump - anyone have a quick answer?

mrh33916 · 03-24-2010, 11:09 AM

I'm guessing here but maybe the 11-2's are smooth on the outside and the larger drums have the cooling fins around them???

chrismoore701 · 03-24-2010, 12:20 PM

I could be wrong, but 1/2 ton usually have the smaller brakes, I just did my C10 and it was 2" if you are concerned about getting the wrong set, just buy both and take one back

Turbo85GMC · 03-24-2010, 12:20 PM

I had to pull the wheel and drum to measure mine. All of the parts places seem to go by the measurements, not by the RPO codes. Bite the bullet and do it. Then write it down. You'll only ever have to do it once.

Here's my Tip: Measure the width of the brake lining (2" vs 2-3/4"), it's easier than measuring the diameter accurately with all the brake parts in the middle!

Slofarmtruck · 03-24-2010, 06:22 PM

Quote:

Originally Posted by mrh33916

I'm guessing here but maybe the 11-2's are smooth on the outside and the larger drums have the cooling fins around them???

My 11-2 drums have cooling fins. Its not that hard to pull a tire and measure.

03-23-2010, 09:09 AM	#1
C10Silverado79 Registered User Join Date: Feb 2010 Location: York, PA Posts: 180	Brake Question. I was looking up prices to put new rear brakes on the truck and apparently there are 2 different size brake systems on these truck. ( 11 x 2 and 11 -5/32 x 2-3/4). Is there any way to know what size my truck has without pulling the wheel and drum off? __________________ 1979 C10 Silverado 1998 Camry 5spd 2005 Harley ElectraGlide

03-24-2010, 10:55 AM	#2
C10Silverado79 Registered User Join Date: Feb 2010 Location: York, PA Posts: 180	Re: Brake Question. bump - anyone have a quick answer? __________________ 1979 C10 Silverado 1998 Camry 5spd 2005 Harley ElectraGlide

03-24-2010, 11:09 AM	#3
mrh33916 Project '67 454 Join Date: Jan 2009 Location: Columbia SC Posts: 283	Re: Brake Question. I'm guessing here but maybe the 11-2's are smooth on the outside and the larger drums have the cooling fins around them???

03-24-2010, 12:20 PM	#4
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,319	Re: Brake Question. I could be wrong, but 1/2 ton usually have the smaller brakes, I just did my C10 and it was 2" if you are concerned about getting the wrong set, just buy both and take one back __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-24-2010, 12:20 PM	#5
Turbo85GMC Registered User Join Date: Apr 2005 Location: Medford, MA Posts: 307	Re: Brake Question. I had to pull the wheel and drum to measure mine. All of the parts places seem to go by the measurements, not by the RPO codes. Bite the bullet and do it. Then write it down. You'll only ever have to do it once. Here's my Tip: Measure the width of the brake lining (2" vs 2-3/4"), it's easier than measuring the diameter accurately with all the brake parts in the middle! __________________ '85 GMC 1500 "Friends don't let friends drive stock!"



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