GCF Posted August 19, 2021 Report Share Posted August 19, 2021 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). Quote Link to comment
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