Replace Rear Drum Brakes to Disc - 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 12-31-1969, 08:00 PM   #1
Senior Member
Posts like a Turbo
 
Join Date: Jan 2002
Location: Torrington, CT
Posts: 267
Thanks: 0
Thanked 0 Times in 0 Posts
csprague is on a distinguished road
Default

$200 apiece for rotors?

I replaced mine about six months ago, I paid $20 for each.
csprague is offline   Reply With Quote
Old 12-31-1969, 08:00 PM   #2
Senior Member
Posts like a Camaro
 
Join Date: Jan 2002
Location: Simi Valley, CA
Posts: 971
Thanks: 0
Thanked 1 Time in 1 Post
99BonnevilleSE is on a distinguished road
Default

I have been looking at my neighbors 98 Grand Prix and it seems the front brakes use the same mounting and such. I am not 100% sure of that yet since I need to take off the wheel and look at it side by side with my car. But you could get a 2 piston system from Baer since they have a 2,4 or 6 piston system for the front brakes of Grand Prix'*. Also could upgrade to the 11.9" rotors that GM has also. Check on http://www.clubgp.com/forum and search in the suspension and brakes section and it will come up.

As for the rear disc conversion, it is such a pain that it is not worth it. It would be more intelligent to just put all the money in the front discs get a 4 piston system since the front brakes do 80% of the stopping in any car. And our drums in the back are big enough.
_________________
1999 Black Bonneville SE

3" I/E, Shift Kit (higest setting), Polyurethane Bushings, no MAF screen

<font size=-1>[ This Message was edited by: 99BonnevilleSE on 2002-05-25 13:14 ]</font>
99BonnevilleSE is offline   Reply With Quote
Old 12-31-1969, 08:00 PM   #3
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2002
Location: Clinton, MS
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
BigAl is on a distinguished road
Default

Thanks. My shop tells me the GP is identical in parts to the Bonneville'*. I'll check into it. I'd like ot go to the 11.9" rotor, but I might have a problem with the stock chrome wheels I have being in the way. I've seen those on a GP, but the wheels are a concern. I'm not ready to replace them yet.
BigAl is offline   Reply With Quote
Old 12-31-1969, 08:00 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2002
Location: Clinton, MS
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
BigAl is on a distinguished road
Default

Has anyone tried this? I've seen some of the early model GP'* with rear disc. Since these bad boy Bonnies can get up there I've found it necessary at times to need to stop pretty quick. I'm also having trouble with my front floating calipers. They rub the pads at an angle and when it'* time to stop they vibrate since they are cooling and heating at the same time. My shop tells me I need to replace the calipers with a replacement/repair kit I can get from the dealer for about $80.00 - $100.00 and also replace my rotors. The best price I could find were $200.00 a piece for rotors. It will fix the caliper and allow it to align correctly. I think I'd rather replace the calipers with 2 or 3 cylinder calipers instead, but what do I use? Any comments?
BigAl is offline   Reply With Quote
Old 06-14-2002, 11:42 PM   #5
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default

Here'* some info: THIS IS FOR GRAND PRIX'* BUT I THINK YOU CAN MAKE IT WORK!
Upgrading to Baer Brakes

Tools you will need:

Jack
Jack stands
Hammer or rubber mallet
Socket wrench
Sockets (10mm, 12mm, 13mm, 14mm, 15mm, and 19mm)
Box wrenches (10mm and 13mm)
Torque wrench
#30 Torx driver
Installing the Front System

Before starting, fit the brake assembly in one of the removed wheels to insure there will be no clearance problems

Remove the stock brake components (pads, rotors, calipers, hoses, etc.) using a 15mm socket wrench and 12mm line wrench
FOR SPORT SYSTEMS ONLY: modify spindle by grinding about 1/8" with a metal file.
Install the new bracket to the backside of the spindle and attach with 14mm bolts, washers and nuts
Insert bracket from behind with spacers pointing outboard
Insert bolt from behind (without the washer)
Put the washer against the aluminum upright and install nut
Torque to 110-ft. lb.
Place rotor over hub seat and secure with two lug nuts
Install caliper with bleeder pointing up
Using 12mm bolts secure and torque to 85-ft. lb.
Install brake hose
Watch hose throughout suspension movement to ensure it does not contact suspension, spring, strut, etc.
Keep hose clocked toward inner fender wall
Once finished installing, perform a final check on both rotors for clearance from all obstructions and for being properly centered between the calipers and brake pads. You may find that the ABS sensor'* bracket is touching one or both rotors and in this case, bend the bracket slightly back (1/8" or 3/16" should be enough). If other obstructions are present or if the rotors don't center properly between the pads, re-check all previous steps and correct any problems. Do not proceed until all concerns have been addressed.
Proceed to Installing the Rear System, or, if done, proceed to bleeding the System.

Installing the Rear System

Remove the rear brakes, hubs, and parking brake mechanisms. You will need a 13mm wrench, 10mm socket, and #30 Torx driver
Using original bolts, install the new bracket and hub
Caliper should be clocked to the rear of the car and up
One bolt is shorter than the other - this one goes to the bottom and front of the hub so as to not run into the control arm
Torque to 40-ft. lb.
Install rotor and secure with two lug nuts
Install caliper behind the axle with 12mm bolts, washers, and nuts using a 19mm socket
Torque to 85-ft. lb.
Install brake hose
Install at caliper end first and loosely secure with banjo bolts - hose should point to the outside of the car and then curve up over the upright
Use Adell (cushion) clamp to secure the hose to the upper caliper mount
Clamp goes on inside of bracket
Hose should run up to the clamp, then run horizontally as in the figure below


Attach hose to flare bracket and hard line
Tighten clamp and banjo bolt making sure hose will not rub on anything
Reinstall factory parking brake cables
Proceed to Bleeding the System
Bleeding the System

Seasoning the Rotors

Bedding the Pads
DeathRat is offline   Reply With Quote
Old 07-10-2002, 11:06 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2002
Location: Clinton, MS
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
BigAl is on a distinguished road
Default

That'* good advise. I'll let you know how it turns out. Thanks.
BigAl is offline   Reply With Quote
Old 07-11-2002, 05:08 PM   #7
Senior Member
Posts like a Turbo
 
Join Date: May 2002
Posts: 334
Thanks: 0
Thanked 0 Times in 0 Posts
CDecker is on a distinguished road
Default

So your saying the Baer kit might work, and replace our rear drums with rear disc'* ? Does this kit include the bracketry and everything else needed?
CDecker is offline   Reply With Quote
Old 07-12-2002, 05:20 PM   #8
Senior Member
Posts like a Turbo
 
Join Date: Jan 2002
Location: East Lansing, MI
Posts: 294
Thanks: 0
Thanked 0 Times in 0 Posts
skza is on a distinguished road
Default

I do know one issue with switching from drum to disc brakes is the master cylinder. Drum brakes require much less pressure to operate than disc brakes do. So if you were to convert, you would probably have to install a complete custom brake system. What a PITA!


Lee


Then again, we could just copy what the 2k+ bonnevilles have.
skza is offline   Reply With Quote
Old 07-13-2002, 10:55 AM   #9
Senior Member
Posts like a Turbo
 
Join Date: Jan 2002
Location: Torrington, CT
Posts: 267
Thanks: 0
Thanked 0 Times in 0 Posts
csprague is on a distinguished road
Default

Yeah, you'd need a different master cylinder, or a proportioning valve...
csprague is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1971 Chevelle drum to disc ChevelleGalaxie500 Chevrolet 9 11-19-2013 10:02 PM
Rear Brakes.......... Drum To Disc swap?? SuperchargedLSS Performance, Brainstorming & Tuning 6 11-29-2007 12:32 AM
Disc vs. Drum Brakes - To Upgrade or Not lash General GM Chat 14 05-24-2006 01:50 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


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 02:02 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.