Adjusting Rear Drum Brakes - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-07-2006, 01:01 AM   #1
Guest
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: West Point, Utah - Village Idiot
Posts: 1,606
Thanks: 0
Thanked 2 Times in 2 Posts
SSE Motorhead is on a distinguished road
Default Adjusting Rear Drum Brakes

Pulling the brake drum, adjusting the brakes, installing the drum (only to find it won’t go on because you put too much adjustment in), pulling the drum, taking some adjustment out, installing the drum, etc. is a rinky-dink way to adjust drum brakes, and you can’t adjust them properly this way. So I decided to do something about it and drilled a ˝” hole in my brake drums. There are 3 holes in the axle flange, and I installed the drums with my new hole over the large hole in the flange. Now I can access the adjuster with a screwdriver and adjust the brakes until they’re just beginning to drag. Still have to pull the wheel to do it, but the drum doesn’t have to come off. I’m not worried about the little bit of dirt or water that may come in through the hole – the rim covers it somewhat. I’m happy.
Name:  brakedrum.jpg
Views: 371
Size:  15.5 KB
SSE Motorhead is offline   Reply With Quote
Old 11-07-2006, 01:09 AM   #2
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

id be worried about the balance of the drum that is now thrown off because of the hole....

ill stick to adjusting the hard way
1993 SLE is offline   Reply With Quote
Old 11-07-2006, 01:15 AM   #3
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

Quote:
Originally Posted by 1993 SLE
id be worried about the balance of the drum that is not thrown off because of the hole....
I was wondering about the same thing, as well as the integrity of the drum itself. Are the holes for the studs drilled or cast, and will the shorter distance now between the stud holes and the adjustment hole weaken the drum?
Archon is offline   Reply With Quote
Old 11-07-2006, 01:48 AM   #4
Senior Member
Posts like a 4 Banger
 
Join Date: Oct 2006
Posts: 141
Thanks: 0
Thanked 0 Times in 0 Posts
motorhead is on a distinguished road
Default

Quote:
Originally Posted by Archon
Quote:
Originally Posted by 1993 SLE
id be worried about the balance of the drum that is not thrown off because of the hole....
I was wondering about the same thing, as well as the integrity of the drum itself. Are the holes for the studs drilled or cast, and will the shorter distance now between the stud holes and the adjustment hole weaken the drum?

A small hole that close to the center of rotation will not cause a noticible vibration unless you are extreamly sensitive to vibes.

The holes in a drum are punched (I believe) so not drilled or cast.

The idea seems a little weak to me. For the effort you went through to drill a hole, you could have just adjusted the brakes. And even aside from that, they are self adjusting if they are in proper working condition so why even bother with the hole drilling or adjusting? If they don't adjust on there own, then there is something else wrong anyway.
motorhead is offline   Reply With Quote
Old 11-07-2006, 01:49 AM   #5
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Looks like long-term testing might be the only way to tell on this one. Keep us updated on the ride quality and longevity of this mod.

As we all know, the rear brakes make up very little of the stopping power of these cars, especially if the drums are out of adjustment. I wouldn't expect there to be big issues with this, but time will tell.
big_news_1 is offline   Reply With Quote
Old 11-07-2006, 12:05 PM   #6
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

Quote:
Originally Posted by motorhead
If they don't adjust on there own, then there is something else wrong anyway.
not totally accurate...yes the brakes are self adjusting on the Bonnes, BUT do not rely on the self adjusters alone, every time that you do a tire rotation you should MANUALLY adjust the rear brakes...
1993 SLE is offline   Reply With Quote
Old 11-07-2006, 12:11 PM   #7
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,646
Thanked 998 Times in 774 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Whoa! This is weird. You could have adjusted the brakes from behind the back plate. Leave the drum on and adjust until it the drum stops turning. Not too tight, but enough to stop the drum.


I wonder if that will still pass state inspection?
Mike is online now   Reply With Quote
Old 11-07-2006, 12:11 PM   #8
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

Drilled Drums
Cheetah is offline   Reply With Quote
Old 11-07-2006, 12:23 PM   #9
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I think the FSM says that there is a knockout or spot to drill in the backing plate to achieve the same thing.

If it works.. great.
BillBoost37 is offline   Reply With Quote
Old 11-07-2006, 12:35 PM   #10
Senior Member
True Car Nut
 
Join Date: Jan 2005
Location: Montevideo, MN MWBF '05, '06, '07 WCBF '06 '07 survivor
Posts: 3,882
Thanks: 0
Thanked 0 Times in 0 Posts
sonoma_zr2 is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
I think the FSM says that there is a knockout or spot to drill in the backing plate to achieve the same thing.

If it works.. great.
the knockouts are not for adjustments. they are to release or retract calipers to aid in removing drum.
sonoma_zr2 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rear drum brakes Dbirds General GM Chat 5 06-21-2012 09:09 AM
Rear Brakes.......... Drum To Disc swap?? SuperchargedLSS Performance, Brainstorming & Tuning 6 11-29-2007 12:32 AM
Rear Drum Brakes.... Merlin 91/97 Performance, Brainstorming & Tuning 2 03-21-2004 07:28 PM
97 Bonneville SSE Rear Drum Brakes/ Buildup/ Grind Noise - ? 97BonnSSE 1992-1999 5 01-02-2003 09:23 PM
Replace Rear Drum Brakes to Disc BigAl 1992-1999 8 07-13-2002 10:55 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:05 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.