Power Brake Booster replacment Question

[Zerpentyne Fire]

My 1965 Dodge Coronet has Drum brakes and an old power brake booster with a duel reservoir leaking master cylinder that's well over 40 years old.
What is the best way to test its working condition and as for the buck/economy what's the best way to go when buying a new Brake Booster and master cylinder. And what's the difference between a 7" vs 8" in size vacuum booster.

Thanks,
Zerpentyne

 

[themechanic]

Check the prices at PST and Piratejacks.

Put a vacuum on the booster to check for leaks. If it leaks replace it or send it to a rebuilder.

Google is your friend.

 

[Zerpentyne Fire]

Thank's.