Brake Light Switch

I have a 90 Mustang LX with a 2.3 L Engine, i just replaced the brake light switch and the new one wont work either unless i push on the switch itself. im sure it isnt in right. but is there anybody who could send be a picture or directions to clear this mess up for me?
i mean the switch should be stationary shouldnt it? right now its connected up to where the brake pedal meets the shaft for the master cylender. HELP!