Previous Thread
Next Thread
Print Thread
What master Cylinder To Use? #2266770
03/10/17 02:01 PM
03/10/17 02:01 PM
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
70sixpkrt Offline OP
master
70sixpkrt  Offline OP
master

Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
1970 Dodge Charger originally came with power drum brakes. Was converted about 35 years ago to power front disc brakes. I built a motor about 15 yrs ago and didn't have enough vacuum for power brakes so I pulled the power booster out and been running manual disc for yrs. It's time for a new master cylinder and wondering which one to use. I am using Raybestos #7008 10.97 rotors and the Raybestos #RC4065-66 single piston Caliper all for a 1970 Dodge Charger. I was told to use 15/16" Master Cylinder MC36406 off of a 1973-1975 A Body. I was also told to use a 1" Master Cylinder MC36400 off of a 1973-1977 B Body. Any suggestions?


[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)
Re: What master Cylinder To Use? [Re: 70sixpkrt] #2269172
03/14/17 06:38 AM
03/14/17 06:38 AM
Joined: Jul 2013
Posts: 1,272
Northern Calyfornua
S
Sxrxrnr Offline
pro stock
Sxrxrnr  Offline
pro stock
S

Joined: Jul 2013
Posts: 1,272
Northern Calyfornua
Smaller MC piston in my opinion always best for non-PB system. I run a 15/16th on my E Body, disc brake,,,, much better braking than previously installed 1 1/8th MC,,,it was miserable. Gave me sufficiently greater brake clamping force that was able to switch from nasty dirty pads to very clean ceramics.

Re: What master Cylinder To Use? [Re: 70sixpkrt] #2269312
03/14/17 01:30 PM
03/14/17 01:30 PM
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
70sixpkrt Offline OP
master
70sixpkrt  Offline OP
master

Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
I ended up going with the 15/16" master cylinder. Won't be able to install it until next month. I am also changing the Proportioning Valve at the same time.


[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)
Re: What master Cylinder To Use? [Re: 70sixpkrt] #2271986
03/18/17 08:33 PM
03/18/17 08:33 PM
Joined: Jan 2007
Posts: 7,664
IN
A
ahy Offline
master
ahy  Offline
master
A

Joined: Jan 2007
Posts: 7,664
IN
Agree with the 15/16" diameter with manual discs. Dr Diff has one in aluminum which would save some weight.

Hopefully the brake linkage was changed out when the power brakes were removed. The manual linkage gives more leverage for use w/o booster.

Re: What master Cylinder To Use? [Re: 70sixpkrt] #2273756
03/21/17 04:24 PM
03/21/17 04:24 PM
Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger Offline
master
72Swinger  Offline
master

Joined: Feb 2011
Posts: 4,302
Nebraska
I have a 15/16 with Viper front calpiers and rear drums with an original drum/drum proportioning valve. Works excellent.


Mopar to the bone!!!
Re: What master Cylinder To Use? [Re: 70sixpkrt] #2274679
03/23/17 10:12 AM
03/23/17 10:12 AM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
Too Many Posts
70Cuda383  Offline
Too Many Posts

Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
Looks like you've already purchased, but was gonna ask, what size did you have and how did you like the pedal feel?


**Photobucket sucks**
Re: What master Cylinder To Use? [Re: 70sixpkrt] #2274753
03/23/17 12:57 PM
03/23/17 12:57 PM
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
70sixpkrt Offline OP
master
70sixpkrt  Offline OP
master

Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
I don't know exactly what master cylinder I was using but think it was a 1 1/32. I ended up getting a 15/16 but haven't installed it yet. It wont be for another month. I have been talking to Dr Diff about my whole brake system.


[img]http://www.imgur.com/hxlGUJt.gif[/img]
4-speed
3:54 Dana
13.01 @107.93 with street tires (not hooking up)
Re: What master Cylinder To Use? [Re: 70sixpkrt] #2276616
03/26/17 05:04 PM
03/26/17 05:04 PM
Joined: Nov 2004
Posts: 340
Vitoria, Spain
C
Coke Offline
enthusiast
Coke  Offline
enthusiast
C

Joined: Nov 2004
Posts: 340
Vitoria, Spain
I had an alumnium mopar MC 1 1/32" and i just have replaced it for a 15/16" cast iron Dorman unit (73-76 A body)
I haven,t run the car yet, but at least the effort and the pressure on the front calipers are the same as the 1 1/32 mc.
1500 psi with both MCs ,pressing the pedal with all my force(manual brakes)

Last edited by Coke; 03/26/17 05:22 PM.






Powered by UBB.threads™ PHP Forum Software 7.7.1