How can I tell what rear brakes I have. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rs74** · 12-04-2012, 09:01 PM

I need to put new shoes on the back and will probably put new drums on as well. This issue is that my 85 came with a 10 bolt and I swapped it out for a 12 bolt. So the SPID sticker doesn't coencide with what is in there now. Can I just take a shoe and drum to the parts store and have them measure them. What about wheel cylinders, axle seals and such.

Is there any type of numbers on the rear end that will tell me maybe what it is. I am not sure what year the rear end even is.

86c20 · 12-05-2012, 07:49 AM

if i recall the numbers on a 12 are just to the right of the pot on the shafts or they are on the pot itself

**Sodak** · 12-05-2012, 09:34 AM

When i replaced my shoes on my 12 bolt the size was stamped on the shoe itself.

donut · 12-05-2012, 08:41 PM

As needed, take your old parts with you. The only way to be sure your getting the same stuff. Who knows who swapped what over the years and how accurate the "computer" at the parts store is.

Tx Firefighter · 12-05-2012, 09:03 PM

Flip the brake drum over and use a tape measure to get the diameter. Then measure the width of the friction material on the brake shoes to get the width.

12-04-2012, 09:01 PM	#1
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	How can I tell what rear brakes I have. I need to put new shoes on the back and will probably put new drums on as well. This issue is that my 85 came with a 10 bolt and I swapped it out for a 12 bolt. So the SPID sticker doesn't coencide with what is in there now. Can I just take a shoe and drum to the parts store and have them measure them. What about wheel cylinders, axle seals and such. Is there any type of numbers on the rear end that will tell me maybe what it is. I am not sure what year the rear end even is.

12-05-2012, 07:49 AM	#2
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: How can I tell what rear brakes I have. if i recall the numbers on a 12 are just to the right of the pot on the shafts or they are on the pot itself __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

12-05-2012, 09:34 AM	#3
Sodak Active Member Join Date: Oct 2012 Location: Deadwood SD Posts: 173	Re: How can I tell what rear brakes I have. When i replaced my shoes on my 12 bolt the size was stamped on the shoe itself.

12-05-2012, 08:41 PM	#4
donut Registered User Join Date: Aug 2009 Location: S.C. Posts: 1,593	Re: How can I tell what rear brakes I have. As needed, take your old parts with you. The only way to be sure your getting the same stuff. Who knows who swapped what over the years and how accurate the "computer" at the parts store is. __________________ '86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ) I'm kinda like duct tape- no real purpose, but handy to have around.

12-05-2012, 09:03 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: How can I tell what rear brakes I have. Flip the brake drum over and use a tape measure to get the diameter. Then measure the width of the friction material on the brake shoes to get the width.



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