There are 3 things to look at 1) make sure the master is bled before installing. Many will put the new master on, fill and bleed brakes. You might have some air trapped in the master. 2) check the switch with a volt/ohm meter to make sure it is working. 3) If no air in brake system and switch works check the wiring to the switch. Depending on the make of buggy some use a control ground setup in other words 12v power is run to accessories and the switch completes the ground some will use a completed ground to accessories and the switch will complete the 12v.
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