Are you sure it is a light bulb and not an LED assembly. LED assemblies are typically not repairable. You may be able to get a replacement module for the brake light housing, for example later model Yamaha golf carts have an LED module mounted in a rubber ring that snaps into the rear light housing.
Hope this helps, send me a PM if you would like me to look at your cart.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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