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'56 6400 Brake upgrade
#1326640 Wed Sep 18 2019 10:48 AM
Joined: Jul 2019
Posts: 15
R
RmJr Offline OP
New Guy
I need some help with my power brake system.

From the looks of it I need to replace most of the parts. I would like to upgrade to a modern master cylinder, with front and rear independent circuits.
I have searched Stovebolt and a couple other forums for a bolt in power brake system for Drum/Drum. I am sure someone out there has made this
upgrade, maybe even knows the part numbers used.

Has anyone had any luck sourcing an under cab master cylinder that works with the 6 wheel cylinder, 2 ton trucks?

Thanks in advance

Re: '56 6400 Brake upgrade
RmJr #1326664 Wed Sep 18 2019 01:45 PM
Joined: Nov 2005
Posts: 5,682
3
3B Offline
Master Gabster
Hy RmJr, welcome, I have never seen a conversion kit from single system master to dual circuit master advertised for your size of truck. You have two basic choices a vacuum boosted system or a hydraulically boosted system, the hydraulically boosted system would require the installation of a power steering pump. I recommend using a dual master cylinder which has the same size bore as your original system, certainly not any smaller on the bore. You will probably have to piece together you own kit, just make sure everyone is aware these parts are for a drum/drum system. Good luck and don't be afraid to come back and ask more questions.

Re: '56 6400 Brake upgrade
RmJr #1326668 Wed Sep 18 2019 02:49 PM
Joined: Sep 2018
Posts: 40
N
Wrench Fetcher
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1089476/1.html

This guy has installed a dual master/booster on his 2 ton. I think it was part of a front disc brake kit put together by 'RDomeck' so the master would be a drum/disc.

I tried to get one of them to cough up part numbers with no luck. Seems as though when it comes to making money with a kit part numbers are not something that is shared !?!

Re: '56 6400 Brake upgrade
RmJr #1326669 Wed Sep 18 2019 02:50 PM
Joined: Sep 2018
Posts: 40
N
Wrench Fetcher

Re: '56 6400 Brake upgrade
RmJr #1326703 Wed Sep 18 2019 07:03 PM
Joined: Jun 2011
Posts: 3,536
E
Shop Shark
I seem to recall there is a late '80's Corvette drum/drum MC that could be used with any booster.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: '56 6400 Brake upgrade
EdPruss #1326714 Wed Sep 18 2019 09:10 PM
Joined: Dec 2015
Posts: 2,086
Big Bolt Forum Moderator
Originally Posted by EdPruss
I seem to recall there is a late '80's Corvette drum/drum MC that could be used with any booster.

Ed

Maybe for a 1/2 ton but not for a 2 ton, it would not have a big enough bore to push that much fluid.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
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Sufficient unto the day is the evil thereof
Re: '56 6400 Brake upgrade
RmJr #1326719 Wed Sep 18 2019 09:44 PM
Joined: Nov 2010
Posts: 608
R
Shop Shark
Noonan, If you knew the amount of time I have invested in making this kit work for these big old trucks you might understand that I am not making very much money on these kits. I have had a couple of guys run my master bracket with the modern dual circuit vacuum boosted master with success. I have not personally driven a drum brake truck with that set up, but As I understand, it works well.

On the kits, I am about a week away from having 5 kits put together for sale.


Randy Domeck
Indianapolis Fabrications
rdomeck@me.com
Indianapolis, In. 46254
317-258-0039

Re: '56 6400 Brake upgrade
RmJr #1326728 Wed Sep 18 2019 10:29 PM
Joined: Feb 2016
Posts: 381
7
Shop Shark
Vette's have been disc/disc since '63, unless that m/c was an aftermarket special setup.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
Re: '56 6400 Brake upgrade
RDomeck #1326733 Wed Sep 18 2019 11:10 PM
Joined: Jul 2019
Posts: 15
R
RmJr Offline OP
New Guy
Hi RDomeck,
I understand the work/time that you must have spent on this.
I PMed you earlier, I think we should talk.

Does anyone know the MC volume required to push 6 wheel cylinders?

Re: '56 6400 Brake upgrade
78buckshot #1326734 Wed Sep 18 2019 11:12 PM
Joined: May 2015
Posts: 2,498
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Originally Posted by 78buckshot
Vette's have been disc/disc since '63, unless that m/c was an aftermarket special setup.

'63 Vettes were drum/drum. A friend has one that he's converting to disc.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
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