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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old Nov 27, 2021 | 11:44 PM
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Dentside1974 highboy's Avatar
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Brake question

New to the forum, I have a 1974 f250 highboy that had drum brakes front and back, I swapped the front end out for disc brake front end out of a 1976. My question is do I need to get a different master cylinder and proportioning valve?
The disc brake front end came out of a 1976 f250 4x4 with a auto trans, my 74 has a 4 speed
 

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Old Nov 28, 2021 | 01:27 AM
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Yes. The reservoirs are different for disc vs. drum. Can you get the MC and valve from the 76' that you got the brakes from?
 
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Old Nov 28, 2021 | 01:28 AM
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As many have said, the master needs to be correct. Just find one that pumps fluid. Which ever one you choose a proportional valve will be needed to control the rear bias.
 
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Old Nov 28, 2021 | 01:30 AM
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Both disc and drum need residual pressure, but in different amounts. These valves are usually right on the master cylinder where the lines screw in. So research that along with proportioning.
 
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Old Nov 28, 2021 | 12:18 PM
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Dentside1974 highboy
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Originally Posted by SonofaFord
Yes. The reservoirs are different for disc vs. drum. Can you get the MC and valve from the 76' that you got the brakes from?
The truck is no longer available to get parts from anymore,my truck has a duel reservoir mc , a big one and a small one, so can I just buy a mc and proportioning valve for a 76 and install on my truck?
 
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Old Nov 28, 2021 | 06:25 PM
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Yes buy a 76 MC and one of the generic disc/drum brass proportioning valves carried by LMC, Mac’s NPD etc..

You will need to make or buy some additional brake lines and may run into some fuss with the booster—piston rod length, travel, etc…?

Also, you will need delete existing differential valve.
 
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Old Nov 28, 2021 | 06:52 PM
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Brakes

Thanks for the info I appreciate it.
 
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