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the truck should already have a brake booster fitted?
if its not working then you don't have to use a dealership to replace it but I would say to use a Mitsubishi specialist
however one thing to be aware of is there's a recall on the hydraulic accumulator sphere for the pajero so before doing anything else its well worth getting in touch with your local Mitsubishi dealer to see if your VIN falls into the recall area as they will fit and replace free of charge
OK looks like the accumulator / booster sphere has already been changed
in that case I'd check that the vacuum line from the engine and its 1 way valve to the main booster is all intact and not leaking