You have to have a combination. If you have a key lock you don't need a combination, all it is is a lock that says master and a key to turn it and then it opens what you have in it.
I'm not sure which master lock you are asking about, but see related links below for methods of opening combination locks
use a fire hyderant and bang it in a downward motion hitting the lock. do this a couple of times and it should do the trick.
It depends on the make of the lock. Many time you need to know the combination. Sesame locks require a pin that goes in the shackle hole when the shackle is 180 degrees from open. Master combination locks with a scroll combination require a reset key that can only be used when the current combination is known in order to change. Other padlocks require the lock to be open and the shackle turned 180 degrees and pushed down while setting the combination.
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If you do not have the combination, there is no way to open the lock. A master combination would defeat the purpose of having the lock.
With the combination
You have to have a combination. If you have a key lock you don't need a combination, all it is is a lock that says master and a key to turn it and then it opens what you have in it.
There is no "master combination" that can open any lock. There would be no use for the lock if that were the case.
It will come with a slip of paper that has the specific combination to that lock. Each individual lock has it's own combination.
A locksmith will be able to provide the combination from the code number stamped on the back of the lock.
don't now and don't care
Search for combination locks on Amazon. There are lots of types to choose from. The Master Lock official website contains a wide array of combination locks, also.
I'm not sure which master lock you are asking about, but see related links below for methods of opening combination locks
Master Lock was created in 1921.
use a fire hyderant and bang it in a downward motion hitting the lock. do this a couple of times and it should do the trick.
The motto of Master Lock is 'Tough Under Fire'.