[xAimz]

I have a 1991 supra, and im having problems with the brakes.
when i press the brake pedal it goes all the way down, and doesnt seem to slow the car down. the guy that i bought it from says it might be the master cylinder.
Is there a way i could find out exactly whats wrong, could it be the master cylinder or do i need to bleed the brakes.
what Dot brake fluid does mk3 use?