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Rear axle disc brake master cylinder/booster which one?
#1156763
01/14/12 06:18 AM
01/14/12 06:18 AM
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Joined: Jan 2003
Posts: 3,131
across the river from Portland...
472 R/T SE
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,131
across the river from Portland...
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I'm gonna update the wheels/tires on my Charger this spring. It was that or a 671 or 871. Maybe the next upgrade? They'll be 17's on the rear & 16's up front -17's all the way around -18's on the rear & 17's up front. No bigger than that. I haven't decided yet. It will have plenty of rubber though. Just say no to rubber band tires is my motto. I'm sure there's several folks who question me ruining this car. I do have the #'s drivetrain. But all my mods will be easy to change over. With this latest endeavor I might try & find a Ford truck Dana to mod or another 8 3/4. Since I'm running Cal Tracs I don't need to worry about the truck Dana not having a pinion snubber. So my questions: -Which rear would be easier on the wallet to add disc brakes to? -My booster & master cylinder. Do I have to go with hydroboost? -Is there a factory appearing master cylinder that has 2 big reservoirs' that would mount to the Bendix booster? I'm not concerned about vacuum as I already am running a pump. I've seen a few rides using the factory disc/drum master cylinder with the two different size reservoir's. Just because they're doing it doesn't make it right. TIA 
[color:"purple"] HELP SUPPORT THE REGISTRIES.All cars matter.
1970 Charger Registry
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Re: Rear axle disc brake questions.
[Re: 472 R/T SE]
#1156765
01/14/12 11:39 AM
01/14/12 11:39 AM
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Joined: Jan 2003
Posts: 2,836
Detroit boy in Saugerties, NY
BrianShaughnessy
master
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master
Joined: Jan 2003
Posts: 2,836
Detroit boy in Saugerties, NY
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If I had to do things over again...
I'd still go Dana 60. But I'd just call up DoctorDiff and tell him to build it with torino ends and his rear disk kit with a truetrac diff.
No green bearings, no tracloc. No local friend that doesn't work on mopars cutting up a junkyard ford truck dana, and no aerospace rear disks with $200 warped wilwood rotors.
Black Betty: '69 Charger RT: 440 6 pack, TKO600 5 speed, 3.73 Dana.
Sinnamon: '69 Charger RT: 440, 727, 4.30 8.75. High School Sweetheart.
El Grande: '98 Grand Cherokee 5.9 Limited.
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Re: Rear axle disc brake questions.
[Re: AndyF]
#1156767
01/14/12 01:50 PM
01/14/12 01:50 PM
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Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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Andy, whose rear sway bar set up is on the car in the picture? Looks like a fair amount of choice for setting it up.
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: Rear axle disc brake questions.
[Re: AndyF]
#1156768
01/14/12 01:52 PM
01/14/12 01:52 PM
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Joined: Nov 2006
Posts: 1,074
Manitoba Canada
67autocross
super stock
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super stock
Joined: Nov 2006
Posts: 1,074
Manitoba Canada
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You could also try Kore3, they a rear kit for a 8 & 3/4 a guy local to me has them on his 42 Plymouth. www.kore3.com
A new iron curtain drawn across the 49th parallel
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Re: Rear axle disc brake questions.
[Re: racealittle]
#1156769
01/14/12 03:15 PM
01/14/12 03:15 PM
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Joined: Jan 2003
Posts: 31,036
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,036
Oregon
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Quote:
Andy, whose rear sway bar set up is on the car in the picture? Looks like a fair amount of choice for setting it up.
The rear bar was custom built by Tim who owns the Valiant. Firm Feel can build you a similiar bar if you want one.
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Re: Rear axle disc brake questions.
[Re: AndyF]
#1156770
01/14/12 03:20 PM
01/14/12 03:20 PM
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Joined: Jan 2003
Posts: 1,945
Olympia, Washington
tallzag
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,945
Olympia, Washington
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On our Lemons car we run the Dr. Diff rear disc brakes and they work fantastic. We use our car harder than anybody (4000 pound C-Body) and they never fade. The brakes are Mustang Cobra sourced.
On wheel size you pretty much have to run at least 17's to get a decent tire choice. We run the Dunlop Direzza Star Specs, best track day tire for the money out there. They are a summer/performance tire only however. The other tire guys are really liking right now is the Falken Azezzi's (sp?) but have heard they tend to work better on lighter cars. Hoping to experiment with both tires this summer.
Rocket Restorations
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Re: Rear axle disc brake questions.
[Re: tallzag]
#1156771
01/14/12 04:14 PM
01/14/12 04:14 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Quote:
...
On wheel size you pretty much have to run at least 17's to get a decent tire choice. We run the Dunlop Direzza Star Specs, best track day tire for the money out there. They are a summer/performance tire only however. The other tire guys are really liking right now is the Falken Azezzi's (sp?) but have heard they tend to work better on lighter cars. Hoping to experiment with both tires this summer.
So that Dunlop is the current HOT street tire everyone is going to right now??
Duly noted. Thank you. Going to get some 275/40/17's soon.
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Re: Rear axle disc brake questions.
[Re: autoxcuda]
#1156772
01/14/12 05:11 PM
01/14/12 05:11 PM
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Joined: Sep 2005
Posts: 12,481
Chino Valley
RodStRace
I Live Here
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I Live Here
Joined: Sep 2005
Posts: 12,481
Chino Valley
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Just as a note on the green bearings; I asked about the Hotchkiss RR rear discs at MATS last year. It uses discs with green bearings. He said that they have to replace them every 6 months! You probably won't be running the laps they do, but I would not be happy with that kind of lifespan! 
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Re: Rear axle disc brake questions.
[Re: AndyF]
#1156774
01/14/12 05:26 PM
01/14/12 05:26 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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That's a transport tie down eye on the u bolt plate?
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Rear axle disc brake questions.
[Re: jcc]
#1156776
01/14/12 10:25 PM
01/14/12 10:25 PM
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Joined: Jan 2003
Posts: 31,036
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,036
Oregon
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Quote:
That's a transport tie down eye on the u bolt plate?
Chassis dyno tie down, but it also can be used for trailering.
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Re: Rear axle disc brake questions.
[Re: AndyF]
#1156777
01/14/12 11:07 PM
01/14/12 11:07 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Quote:
That is a good point. Many of the rear disc kits require a switch to the green bearings. That is one of the reasons why I always recommend the DoctorDiff kit. He is one of the few guys who actually bothered to design his kit to work with the stock tapered bearings. Many mfgs just rebox a Chevy kit for the Mopar application.
With the DoctorDiff kit the bracket replaces the backing plate and the thrust clearance is set just like a drum brake.
What thrust clearance did you shoot for on Tim's Valiant?
Dan W. with the Hotchkis RR complains about pad knockback with tapered and green bearing. I think he's going to a floater rear end. Wonder what Tim W. opinions and experiances on this issue.
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Re: Rear axle disc brake questions.
[Re: tallzag]
#1156778
01/15/12 10:34 AM
01/15/12 10:34 AM
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Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
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Quote:
On our Lemons car we run the Dr. Diff rear disc brakes and they work fantastic. We use our car harder than anybody (4000 pound C-Body) and they never fade. The brakes are Mustang Cobra sourced.
On wheel size you pretty much have to run at least 17's to get a decent tire choice. We run the Dunlop Direzza Star Specs, best track day tire for the money out there. They are a summer/performance tire only however. The other tire guys are really liking right now is the Falken Azezzi's (sp?) but have heard they tend to work better on lighter cars. Hoping to experiment with both tires this summer.
some of the guys here have been running the star specs - until we discovered the hankook ventus RS - unbelieveable tire and the price is just as unbelieveable - will be running them this summer again...only downside to them is not a huge range of sizes...
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Re: Rear axle disc brake master cylinder/booster which one?
[Re: Kern Dog]
#1156781
01/21/12 07:04 PM
01/21/12 07:04 PM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
My combo defies logic, but it works.
1970 Charger with 12" Cordoba front discs, 11.7 rear discs with a power booster and Master cylinder spec'd for a 75 Dart with disc brakes. In reality, I expected it to be overly biased to the front brakes, but it really works well.
What are piston sizes? I'll bet that's what you did right, without realizing it!
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). The problem with tires like the Hankook is we run the 24 Hours of Lemons and they require a 190 tire treadwear or higher, the Hankook's are 140.
