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Old 07-01-2005, 11:30 AM
1931 steve's Avatar
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Why frame mount brake master cyl

Why do most street rods/hot rods have the brake master cylinder mounted to the frame under the drivers area? Is it a safety reason or a clean look reason?

Thanks guys

Steve

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Last edited by 1931 steve; 07-01-2005 at 12:47 PM. Reason: spelling
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Old 07-01-2005, 11:53 AM
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Same reason why guys put the battery in the trunk. To get a nice clean looking fireall. If you'd leave the master cylinder up front it'd look chubby and out of place.





Mike
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Old 07-01-2005, 12:57 PM
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Mounting the brake system on the frame is easier considering they sell kits with the pedal booster and cylinder all together. Remember to use the proper residual valves.

Mounting the brake pedal on the fire wall may require more work. Issues such as firewall flex, steering column position, aesthetics and hood clearance are to be considered. I have seen in magazines sunken boosters - modified firewalls that make the system look good.


Once you get into it you will see what is best for you.


Mine is on the firewall. 1940 coupe. I do have an issue with the original hood props.
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Old 07-01-2005, 01:32 PM
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Evltwin where are you in the Detroit area? And thank you and nightfire for the info.

Steve
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Old 07-01-2005, 03:26 PM
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This is a 1932 Ford .........a car with a larger firewall than a Model A. I have a Small Block Chevrolet in it. IF you mount the master cylinder on the firewall......you can have trouble working on the left side of the engine. It is also very difficult to make it look nice. Brake fluid WILL GET on the firewall and engine.

There is very little room under the cowl/dash area of a Model A ( the fuel tank is there ) ...and even if you remove the fuel tank......there is almost no room for a hanging pedal and the linkage, braces and parts needed to make it work. The firewall will need to be re-enforced too.

Just buy the frame mount.....and save yourself a LOT of heartache. Larger cars...such as a 40 Ford.........have more room and can be made to work.

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Old 07-01-2005, 10:34 PM
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Sometimes, that location is just stock.

In the case of some earlier cars/trucks(like chev trucks of the 50s) the master cylinder was mounted there. Kits are readily available that let you mount a dual master cylinder & booster into that stock location usinging the original pedal and pedal arm.
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Old 07-03-2005, 06:47 AM
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Yes go with the frame mount. Deuce is correct about the constraints of the Model A dash/firewall areas. Residual valves are required if the master cyl is below the wheel cyls/calipers to keep fluid at those items and retain pedal pressure.
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Old 07-03-2005, 06:15 PM
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I was planing on mounting it to the frame, I was just wondering why they were mounted there. It sounds like space and looks are the reason. Thanks guys, as usual you have been very helpful.

Steve
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