A kind of rubber composition for a brake booster is arranged to improve heat resistance, cryogenic property and brake fluid resistance, to prevent the performance deformation even for an increased brake booster for internal temperature. A kind of rubber composition for a brake booster includes 100 components by ethylene propylene diene rubber (EPDM) polymer weight; 2-20 components are by an inorganic filler weight; 0.5-20 components are by a co-crosslinker weight. Inorganic filler is preferably talcum; Co-crosslinker includes trimethylol-propane trimethacrylate.
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