Stiff brake pedal

MARCH374

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Have a 1979 Aspen with stiff hard pedal. How do you know whether its the Booster or Master Cyclinder ?
Thanks
 
Do they work? Usually when master cylinders are bad it's seized or leaking, if they work but not getting power assist it's the booster.
 
Are the brakes locking up instantly? Check your rear brakes and see if the shoes are binding
 
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