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Jul 21st, 2025 | | | | Joined: Sep 2008 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 46 | i am putting a dual master res from a 67 1/2 ton on my 52 3800, in the same place as my old one, havind read the tech tip it seems straightforward enuf, can i just hook up the rears where they need to be , fronts etc, my concern is there any valve i need, this is a drum drum application | | | | | Joined: Dec 2000 Posts: 506 Shop Shark | | Shop Shark Joined: Dec 2000 Posts: 506 | I assume the master on the 3800 is under the floor same as the 3100 series. You'll need a porportioning valve under the master with residual valves. If its a drum/drum set up use 10 lb for the front and 10 for the rear. Place the residual valves as near the master as possible. If its a disk/drum system use a 2 lb residual valve for the front and a 10 for the rear. Thats it.
Good luck
"Drugs are money, money is power, power is security." - Kent Heiner
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| | | | | Joined: May 2001 Posts: 7,440 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,440 | | | | | | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | Hy guys, if the donor master cylinder is for a disc/drum setup, you should install a 10 p.s.i. residual pressure valve in the front system, if it was for a drum/drum system then no residual pressure valves are required, as they are built in to a drum brake master cylinder, hope that helps. | | | | | Joined: Sep 2008 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 46 | thanks for the input, trying | | | | | Joined: Oct 2008 Posts: 26 Apprentice | | Apprentice Joined: Oct 2008 Posts: 26 | one question about brake lines when upgradeing to a duel master cylinder i have not been able to find. replacing the lines , is it best to stay with the same size? any advantage to going all 1/4. this is a 54 3100. probably going to stay with drums for now untill i get it on the road and driving more. i did rebuild a ft wheel cylinder and could not believe the crude built up in the cylinder and hose. the truck has set for 8 years. ccb | | | | | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | I an not an expert but I think there may be some wrong info in the above posts. I am sure that for a disc setup you will need a 2 pound residual not 10. Some master cylinders have built in residual valves, others do not. Gently insert a small dowel or tooth pick into the ports. If it goes in about 1/2" then the master clyinder does not have a built in residual valve. If the dowel goes in just a little then it does have the valve. Also, when the master cylinder sets low like yours, residual valves are recomended because your brake lines run higher than the master cylinder. I see no use in changing the size of your brake lines for the same type of set up. Do make sure they don't have crud in them. Good luck.
Six volt guy living in a twelve volt world
| | | | | Joined: Dec 2000 Posts: 506 Shop Shark | | Shop Shark Joined: Dec 2000 Posts: 506 | Beltfed is correct. And not all drum/drum masters have residual valves built in -
"Drugs are money, money is power, power is security." - Kent Heiner
Nedrow population 2212
Carbon footprint family of 2/11 tonnes of CO2/yr
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