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1957 - 1960 F100 & Larger F-Series Trucks Discuss the Box Style Ford Trucks

Clutch vs brake master

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Old May 2, 2021 | 08:34 PM
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Clutch vs brake master

Does anyone have a good way to tell these master cylinders apart? I did some looking but didn’t find clear answer. I think they have the same shape and mounting pattern. Im also pretty sure the components are different inside! Any help is appreciated!
 
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Old May 3, 2021 | 08:25 AM
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Has to be different piston sizes. Lmc lists two different brake cylinders too. F100 and F250. I would assume brake would have larger piston and F250 larger than F100. I couldn't find rebuild kits but maybe specs out there somewhere. If anyone sells rebuilts maybe they would know.
 
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Old May 3, 2021 | 08:38 AM
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The difference between the two is the residual pressure valve on a brake cylinder, clutch doesn't have one.
 
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Old May 3, 2021 | 08:50 AM
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Originally Posted by hiball3985
The difference between the two is the residual pressure valve on a brake cylinder, clutch doesn't have one.
A residual pressure valve... so they all have to be disassembled to figure it out? Or is there a bench test that can be performed? Visual inspection isn’t obvious for me!
 
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Old May 3, 2021 | 09:22 AM
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It would be best to take them apart.
 
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