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Re: brake question
If you want a dual master cylinder one for a 68 C-10 works pretty good. I've had one on mine with 54 car drums on the front and Nova drums on the rear for years.
As for a residual valve inside the master cylinder it is the little rubber piece with a spring that looks like a short ballpoint pen spring that is behind the brass seat in the fitting that the line screws in. I don't recommend trying to rebuild a dual master cylinder unless there is no other choice but if one does there are two sheet metal screws in the kit to pull the seats out with and new check valves, springs and seats in the kit. I worked on brakes every day of the week for a number of years sometimes doing four or five brake jobs a day and have never had any luck with rebuilding a dual cylinder.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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