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Dual master cylinder and keeping drums


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I am in the process of changing the master cylinder on my 521 to a dual reservoir master but keeping the drums all around.


I have this new master from what I believe an early 70s 510. I know I need to change the residual valves to keep 10 lbs in the front and rear. Am I able to buy internal parts for these? Or could I remove both residual valves and run external valves in each line?


Notice the rubber valve for the front has two extra slits in it (red lines in the photo).





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