Dual M/C which bowl for disc and drum?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-14-2003, 09:48 AM
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Dual M/C which bowl for disc and drum??

Hi, I got a new power master cyl. for my 50 Ford F1 pu. I put a mustang II in the front and new brakes in the 9" rear. The master cyl has two equal size bowls but the one closest to the vacuum reservoir has 9/16x18 threads compared to the one furthest from the vacuum reservoir has 1/2x20. I need to find out which chamber is used for the front discs and which is used for the rear drum brakes. Thanks for any help getting read to finish the piping at the m/c. Ed ke6bnl

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Old 09-14-2003, 10:26 AM
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Usually the rear reservoir is for the front brakes.
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Old 09-14-2003, 03:55 PM
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Originally posted by rnpit
Usually the rear reservoir is for the front brakes.
Thanks for the quick response, rear meaning the one closest to the vacuum reservoir. I want to make sure since the m/c is mount backwords to most being under the cab??? Thanks Ed ke6bnl
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Old 09-14-2003, 05:54 PM
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That's correct.
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Old 09-15-2003, 06:59 AM
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Dual Cylinder Application

I have to question the application for your master cylinder.
In my experience master cylinders which have equal size reservoirs are for "same-front and rear" systems, i.e., all disc or all drum.
The larger reservoir on drum/disc cylinders is for the disc side since disc calipers require much more fluid capacity than drum cylinders do to operate.
Also the drum side of the cylinder has a residual pressure valve to keep the drum end pre-energized.
If you have disc and drum as you seem to you need to verify your cylinder's proper application.
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