2 3/4 to 2 inch rear brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**dennislbrooks** · 10-28-2017, 09:21 AM

Will the 1967 12 bolt 2" brakes drums, 2" shoes, and backing plates fit/work on a 1985 k10 GM 10 bolt rear axle that now has 2 3/4" brakes on it?

Bigdav160 · 10-28-2017, 09:53 AM

I am going to guess that it would bolt up fine with the exception of the brake drum. The axle flange is going to extend out further and you need a wide drum to cover that space.

*randy500* · 10-28-2017, 11:04 AM

THe brakes will interchange. The wider brakes take a specific backing plate so if you change the backing plate it will work. I have done it many times on square body trucks, on those they can have either 2” or 2 3/4” brakes. The brake cables will probably be different but those interchange too. So install the backing plates complete and use the old brake cables then it will all work.

*randy500* · 10-28-2017, 11:07 AM

Axle flange stick out from rear end housing is called “brake spacing” it is generally a set distance based on rear end type and manufacturer, when there are different width or diameter of brakes the backing plate is offset to make up the difference.

**dennislbrooks** · 10-28-2017, 03:27 PM

Thanks Bigday160 and Randy500. Worked fine ----Tried it today and if not an exact fit it is very close.

10-28-2017, 09:21 AM	#1
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	2 3/4 to 2 inch rear brakes Will the 1967 12 bolt 2" brakes drums, 2" shoes, and backing plates fit/work on a 1985 k10 GM 10 bolt rear axle that now has 2 3/4" brakes on it? __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 10-28-2017 at 09:25 AM. Reason: words

10-28-2017, 09:53 AM	#2
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 2 3/4 to 2 inch rear brakes I am going to guess that it would bolt up fine with the exception of the brake drum. The axle flange is going to extend out further and you need a wide drum to cover that space. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

10-28-2017, 11:04 AM	#3
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: 2 3/4 to 2 inch rear brakes THe brakes will interchange. The wider brakes take a specific backing plate so if you change the backing plate it will work. I have done it many times on square body trucks, on those they can have either 2” or 2 3/4” brakes. The brake cables will probably be different but those interchange too. So install the backing plates complete and use the old brake cables then it will all work.

10-28-2017, 11:07 AM	#4
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: 2 3/4 to 2 inch rear brakes Axle flange stick out from rear end housing is called “brake spacing” it is generally a set distance based on rear end type and manufacturer, when there are different width or diameter of brakes the backing plate is offset to make up the difference.

10-28-2017, 03:27 PM	#5
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: 2 3/4 to 2 inch rear brakes Thanks Bigday160 and Randy500. Worked fine ----Tried it today and if not an exact fit it is very close. __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T



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