Why would they make two different sizes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ubtripn · 10-05-2016, 09:19 AM

of brake shoes for the same 68 C10? They have two different widths. Is it due to the length of bed? It makes no sense at all to me and how do I figure out what was original? Thanks all.

Tdrcreyn4 · 10-05-2016, 09:34 AM

Many but not all of the axles were Eatons either the HO52 or the heavier HO72 which was generally found in the heavier trucks. The brake sizes were different because the assumption is that the heavier trucks need more braking ability.

ubtripn · 10-05-2016, 10:49 AM

I see. I would have thought the heavier axles would have gone on the c20" or 4 wheel drives.

demian5 · 10-05-2016, 11:33 AM

This theory applies to late model trucks and vans as well.

**70STOVEBOLT** · 10-05-2016, 12:38 PM

A C10 should have a 12-bolt GM axle, not an Eaton. I think there were Kelsey-Hayes brake systems and also Wagner brake sytems used, that may be the difference.

ubtripn · 10-05-2016, 03:03 PM

I changed the front drums and shoes a couple years ago and they didn't even ask me what size. The shoes are now cracked up in all directions so I want to make sure what I a running is correct. My rears I haven't done so I can do them to and use them as a reference for size. I think all 4 are the same. Thanks everybody.

**70STOVEBOLT** · 10-05-2016, 04:38 PM

If I remember right, the 11x2 drums are used with wheel cylinders that have two mounting bolts, and the 11x2.5 drums have wheel cylinders with a single mounting bolt.

10-05-2016, 09:19 AM	#1
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Why would they make two different sizes of brake shoes for the same 68 C10? They have two different widths. Is it due to the length of bed? It makes no sense at all to me and how do I figure out what was original? Thanks all.

10-05-2016, 09:34 AM	#2
Tdrcreyn4 Registered User Join Date: Aug 2013 Location: Atlanta, GA Posts: 702	Re: Why would they make two different sizes Many but not all of the axles were Eatons either the HO52 or the heavier HO72 which was generally found in the heavier trucks. The brake sizes were different because the assumption is that the heavier trucks need more braking ability. __________________ 1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process

10-05-2016, 10:49 AM	#3
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Re: Why would they make two different sizes I see. I would have thought the heavier axles would have gone on the c20" or 4 wheel drives.

10-05-2016, 11:33 AM	#4
demian5 Registered User Join Date: Aug 2016 Location: Lake Forest, CA Posts: 2,177	Re: Why would they make two different sizes This theory applies to late model trucks and vans as well. __________________ "Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC

10-05-2016, 12:38 PM	#5
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,254	Re: Why would they make two different sizes A C10 should have a 12-bolt GM axle, not an Eaton. I think there were Kelsey-Hayes brake systems and also Wagner brake sytems used, that may be the difference. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

10-05-2016, 03:03 PM	#6
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Re: Why would they make two different sizes I changed the front drums and shoes a couple years ago and they didn't even ask me what size. The shoes are now cracked up in all directions so I want to make sure what I a running is correct. My rears I haven't done so I can do them to and use them as a reference for size. I think all 4 are the same. Thanks everybody.

10-05-2016, 04:38 PM	#7
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,254	Re: Why would they make two different sizes If I remember right, the 11x2 drums are used with wheel cylinders that have two mounting bolts, and the 11x2.5 drums have wheel cylinders with a single mounting bolt. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear



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