Aftermarket rear brake drums - The 1947 - Present Chevrolet & GMC Truck Message Board Network

likaroc13 · 10-04-2010, 12:12 PM

okay, so i went to put the new drums on my '72 rear yesterday, and the drums don't have the "knock-out" holes that allow you to adjust the brake shoes...my drums came from Carquest....upon researching other parts stores, they seem to have the same issue...since i'm on a time schedule, my dad is just going to have the holes machined...but i was curious whether anyone else has dealt with this problem, & what did you do? do any of the aftermarket restoration suppliers (ECE, Classic Parts, etc.) carry a drum that is correctly machined?

KEL · 10-04-2010, 12:20 PM

i think i adjusted mine out before putting the drums on. then throw it
in reverse, hit the brakes, and the adjusting star is supposed to take care of the rest for you.

brans72 · 10-04-2010, 03:49 PM

Magic word suppose to never seen it actually work worth a darn though.

Jack_71C10 · 10-04-2010, 04:03 PM

You're gonna wish that window was there next time you can't get your drums off.

raycow · 10-04-2010, 06:01 PM

How about putting the adjusting hole in the backing plate, like it used to be in the good old days?

Ray

grs · 10-04-2010, 07:04 PM

I had the same problem. I noticed that the drums had knocks in them. I had to knock them out. It was hard to do. Did you try NAPA?

**jocko** · 10-04-2010, 07:08 PM

seems two pokes from a drill press, one at each end of the knockout - and then a little filing might do in a pinch. But I agree, chaps my butt that they seem to leave out this little "oh by the way" on the replacement drums. But agree, best to knock em out somehow before installation.

likaroc13 · 10-04-2010, 10:10 PM

Quote:

Originally Posted by grs

I had the same problem. I noticed that the drums had knocks in them. I had to knock them out. It was hard to do. Did you try NAPA?

NAPA was closed at the time...not sure what they have...the drums i have are identical to the ones from O'reilly's...and AutoZone had a set that didn't have the knock-out either...there is not even an outlined pattern to show where the hole would be....so, i will just have to machine the hole

Longhorn Man · 10-04-2010, 07:43 PM

the new drums suck in more ways than that.
They wear quick
they warp quick
no knockouts
no spring grove
I always recomend hittin the junkyards or the parts board and locating thick originals. There's a LOT more out there than you'd think.

brans72 · 10-04-2010, 08:39 PM

yeah but who is gonna buy a used set off here that are not local due to shipping.

10-04-2010, 12:12 PM	#1
likaroc13 Rollin' Old Skool Join Date: Jun 2007 Location: Hattiesburg, MS Posts: 5,371	Aftermarket rear brake drums okay, so i went to put the new drums on my '72 rear yesterday, and the drums don't have the "knock-out" holes that allow you to adjust the brake shoes...my drums came from Carquest....upon researching other parts stores, they seem to have the same issue...since i'm on a time schedule, my dad is just going to have the holes machined...but i was curious whether anyone else has dealt with this problem, & what did you do? do any of the aftermarket restoration suppliers (ECE, Classic Parts, etc.) carry a drum that is correctly machined?

10-04-2010, 12:20 PM	#2
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 534	Re: Aftermarket rear brake drums i think i adjusted mine out before putting the drums on. then throw it in reverse, hit the brakes, and the adjusting star is supposed to take care of the rest for you.

10-04-2010, 03:49 PM	#3
brans72 Registered User Join Date: Dec 2009 Location: Durham,NC Posts: 636	Re: Aftermarket rear brake drums Magic word suppose to never seen it actually work worth a darn though.

10-04-2010, 04:03 PM	#4
Jack_71C10 Shortbed club member Join Date: Jan 2008 Location: Halethorpe, MD Posts: 439	Re: Aftermarket rear brake drums You're gonna wish that window was there next time you can't get your drums off. __________________ 71 custom/10 6.0/4L80E SWB ece 4/6 72 custom camper 350/3 spd 2020 Chevy Express 3500 2023 Hyundai Tuscon 1986 GMC 3500 Bucket Truck Sent from my Rotary Phone via 14.4kb/s modem.

10-04-2010, 06:01 PM	#5
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Aftermarket rear brake drums How about putting the adjusting hole in the backing plate, like it used to be in the good old days? Ray

10-04-2010, 07:04 PM	#6
grs Registered User Join Date: Jan 2010 Location: Roanoke, Tx. Posts: 1,561	Re: Aftermarket rear brake drums I had the same problem. I noticed that the drums had knocks in them. I had to knock them out. It was hard to do. Did you try NAPA?

10-04-2010, 07:08 PM	#7
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,976	Re: Aftermarket rear brake drums seems two pokes from a drill press, one at each end of the knockout - and then a little filing might do in a pinch. But I agree, chaps my butt that they seem to leave out this little "oh by the way" on the replacement drums. But agree, best to knock em out somehow before installation.

10-04-2010, 07:43 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Aftermarket rear brake drums the new drums suck in more ways than that. They wear quick they warp quick no knockouts no spring grove I always recomend hittin the junkyards or the parts board and locating thick originals. There's a LOT more out there than you'd think.

10-04-2010, 08:39 PM	#10
brans72 Registered User Join Date: Dec 2009 Location: Durham,NC Posts: 636	Re: Aftermarket rear brake drums yeah but who is gonna buy a used set off here that are not local due to shipping.



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