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#1042047 - 08/02/16 11:22 PM Rear Disk conversion  
Joined: Jan 2008
Posts: 1,198
FinallySS Offline
10+ Year
FinallySS  Offline
10+ Year
Member

Joined: Jan 2008
Posts: 1,198
Nice Sunny Hawaii
Hello guys. I have question to those who did this conversion.

It's gonna be a while before I do this conversion, but wanted to get some input. But first, here are my current setup. I'm working on power steering gearbox at the same time, so I have stock size rotor upfront but cross-drilled/slotted. Pad is semi-metallic Raybestos pad (I forgot which one). Caliper are stock, replaced about three years ago (maybe little longer) with rebuilt one. Rear is stock drum setup with new wheel cylinder and new shoes which was replaced same time I did my front, just to make sure. Drum are stock steel which I replace when I got the car back in 2008. I did measure the drum, and it's in good shape. Running stock 15-inch wheel and no plan to change to bigger wheel yet. Need to fix the body first.

Now, here are the questions. What made you decide to go to rear disk setup? How did you do it (did you use the kit or got parts from donor car/parts counter)? How much did it improve, braking-wise? Anything I should watch out for (such as parking brake cable)?

My reason for swapping is that before I rebuilded my engine, it had plenty of vacuum and I had almost no complaint about braking, but now I have bigger cam than stock and braking efficiency decreased. I believe this is due to less vacuum engine produce because of the cam.

I'm OK with the setup as I just need to step on the pedal little harder, but my wife drive this car from time to time and she's complaining about the brake. Besides, I'm still planning to drop 350 with all the juicy stuff, so improvement in braking wouldn't hurt.

Now, I know I can do some research online, but I trust member here more than some stranger writing up, and looking at some advise(?) look more like accident waiting to happen.

Any input or help are greatly appreciated.


1986 Silver MCSS - Poly bushing and Hotchkis spring w/Bilstein, Posi w/3.73, MSD 6-AL, E-Brock 600cfm, Aluminum 2-row radiator.
1986 Black MCSS - R.I.P............Finally.
#1042054 - 08/03/16 03:07 AM Re: Rear Disk conversion [Re: FinallySS]  
Joined: May 2007
Posts: 5,026
Buick Runner Offline
10+ Year
Buick Runner  Offline
10+ Year
Member

Joined: May 2007
Posts: 5,026
Dharma station 1 the Hydra
Have you upgraded the brake booster yet? 86s, only had single diaphragm boosters. My Regal came with a dual diaphragm booster. They also sell reserve vacuum canisters.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1042057 - 08/03/16 08:17 AM Re: Rear Disk conversion [Re: FinallySS]  
Joined: Jan 2008
Posts: 1,198
FinallySS Offline
10+ Year
FinallySS  Offline
10+ Year
Member

Joined: Jan 2008
Posts: 1,198
Nice Sunny Hawaii
Mine cane with dual diaphragm booster, but don't know the condition. From what I know, I did all the test and feels to be fine.

I did had vacuum canister in mind, but I plan to srop a 350 pretty soon, so plan right now is to have rear disk.


1986 Silver MCSS - Poly bushing and Hotchkis spring w/Bilstein, Posi w/3.73, MSD 6-AL, E-Brock 600cfm, Aluminum 2-row radiator.
1986 Black MCSS - R.I.P............Finally.
#1042058 - 08/03/16 10:30 AM Re: Rear Disk conversion [Re: FinallySS]  
Joined: Apr 2006
Posts: 3,552
GuysMonteSS Offline
10+ Year
GuysMonteSS  Offline
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Member

Joined: Apr 2006
Posts: 3,552
Kentville,Nova Scotia
Another option is a manual brake kit.
Malibu Dave is a member here.
http://www.manualbrakes.com/
He has a lengthy post on this;
http://www.montecarloss.com/community/ubbthreads.php?ubb=showflat&Number=1035214&page=1
Then you don't have to worry about low vacuum...
Guy


GuysMonteSS '86 SS,513 BBC,AFR Heads,UDHarold/Bullet Custom Solid Roller Cam,706 lift,255/263 @ .050,Jesel Shaft Rockers,Balanced & Blueprinted,Doug Nash 4+1 5 Speed,Hurst In-Line Shifter,Ford 9 Inch Rear,SC&C Street Comp Stage 2+ Front End Kit...
#1042065 - 08/03/16 07:46 PM Re: Rear Disk conversion [Re: FinallySS]  
Joined: Jul 2001
Posts: 4,488
Joe87monteSS Offline
15+ Year
Joe87monteSS  Offline
15+ Year
Member

Joined: Jul 2001
Posts: 4,488
Memphis,TN
I chose to change mine to rear disc simply because I don't want to mess with drum brakes.

I got all the parts from a 2000 Camaro, and they fit under the stock 15 inch SS wheel.


Joey
Engine/head builder/machinist
1987 Monte Carlo SS 383/4 Speed
2004 Silverado
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#1042070 - 08/04/16 04:09 AM Re: Rear Disk conversion [Re: FinallySS]  
Joined: Apr 2008
Posts: 75
malibudave78 Offline
10+ Year
malibudave78  Offline
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Member

Joined: Apr 2008
Posts: 75
Houston, TX
I think the biggest issue right now you have a vacuum issue that is affecting your braking, so changing to a rear disc system will not improve your braking because most of your braking is done with the front brakes.

If going to rear disc, there are other items that will usually need to be changed. disc/disc prop valve instead of disc/drum prop valve, different parking brake cables, and maybe a different master cylinder with a larger reservoir.

In my opinion, rear drum brakes will work exceptionally well in most street and drag situations. Only real issue with drum brakes will be that they don't dissipate heat as well as a disc system, but that is not usually an issue on a street driven or drag car. Drum brakes shoes have more friction material than brake pads, they are self energizing, and are usually lighter than disc brakes.

#1042355 - 08/12/16 06:55 AM Re: Rear Disk conversion [Re: FinallySS]  
Joined: Jan 2008
Posts: 1,198
FinallySS Offline
10+ Year
FinallySS  Offline
10+ Year
Member

Joined: Jan 2008
Posts: 1,198
Nice Sunny Hawaii
Thanks Dave and everyone else.

It's gonna be a while before I do this conversion so just wanted to get everyone's input.


1986 Silver MCSS - Poly bushing and Hotchkis spring w/Bilstein, Posi w/3.73, MSD 6-AL, E-Brock 600cfm, Aluminum 2-row radiator.
1986 Black MCSS - R.I.P............Finally.

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