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| | | | Joined: Jul 2019 Posts: 16 'Bolter | | 'Bolter Joined: Jul 2019 Posts: 16 | 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 | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | 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. | | | | | Joined: Sep 2018 Posts: 86 'Bolter | | 'Bolter Joined: Sep 2018 Posts: 86 | https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1089476/1.htmlThis 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 !?! | | | | | Joined: Sep 2018 Posts: 86 'Bolter | | 'Bolter Joined: Sep 2018 Posts: 86 | | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | 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.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | 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. | | | | | Joined: Nov 2010 Posts: 430 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 430 | 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.
| | | | | Joined: Feb 2016 Posts: 1,989 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,989 | Vette's have been disc/disc since '63, unless that m/c was an aftermarket special setup.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Jul 2019 Posts: 16 'Bolter | | 'Bolter Joined: Jul 2019 Posts: 16 | 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? | | | | | Joined: May 2015 Posts: 11,067 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,067 | 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 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | 1965 was the first year for disc brakes on a Vette...now back to trucks, the 6400 would have a 1-1/4" bore MC. Mike B  | | | | | Joined: Jul 2019 Posts: 16 'Bolter | | 'Bolter Joined: Jul 2019 Posts: 16 | | | |
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