HOw do you remove residual pressure check from master?

[LowBuckX]

I want to eliminate the residual pressure checks from inside the master and run external ones.
My master now is a disc/drum but I added rear discs so the 10lb pressure check in the rear port is to much.

Thanks

[LowBuckX]

I think it may be cheaper to get a 68 vette master instead of the external pressure checks. what do you think
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