Residual pressure check valves in oem applications are usually in the master cylinder. When you remove the brake line look in the port you will see a brass insert that the tubing flare seats on, this insert usually contains the residual pressure check valve.
when a residual pressure check valve fails it has similar symptoms to air in
the system, if after bleeding the system the brake pedal is low on the first application but then seems normal it could be the residual valve.
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