your doing it all wrong, your suppose to free the plunger of the brake switch if it is stuck not the pedal of your brake, you can check if the brake switch is working or not by using an ohm meter tester. another palce to look of rhte trouble is to go under the transmission (with full safety proceedure) then check if the linkage is aligned accordingly, otherwise, something can be broken inside and you would need to take it to a garage/dealer shifters are mechanical in nature but they have stop points due to electronic problem, use a star diagnosis computer and check for faults.