Before condemning the brake master, test it by installing plugs in both ports and if you have a hard high pedal, it's not the brake master.
BTW, last weekend I disassembled and inspected the exact same brake junction with warning valve and the internal components can not block the ports inside the junction.
The reason for removing the warning switch is to prevent damage to the plastic tip of the switch which can be shorten each time the internal parts of the junction slide back and forth.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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