I'm finally getting back to work on my '54 Merc Sun Valley after taking about a year off for other more pressing matters. I am having an issue with the brakes locking up. There is a residual check valve just after the master cylinder and I suspect it is malfunctioning. I think that the valve was installed by a previous owner and I don't think the valve is present on a stock brake system. Can anyone confirm that? The valve is a Wilwood 260-1876 10 psi. After a little research, I understand the purpose of the valve is to maintain a small amount of pressure in the system to keep the brakes from feeling "spongy". Does anyone use an external residual pressure valve on a stock brake system? If it is not part of the original stock system, can it be removed or should I replace it? Thanks for any and all help.

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