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softer material maybe not however booster and slightly harder material possibly the booster will reduce the pedal effort for the same brake pressure so in theory you should be able to generate higher pressure's increasing shoe to drum force which will allow you to use a harder material with a higher operating temp range so better long term braking DOWNSIDE; higher pressures will place considerable more strain on hydraulic hoses and cupseals so you will need to check the condition of everything not just bang a booster on