Cadillac SRX Brake Light Not Working

When I Press My Brake Pedal The Brake Lights Do Not Work, But The Tail Lights Do Work.

Pass.side Tail Lamp Lights But Turn Signal And Brake Lamp Do Not Work Front T/s Works Although

However, When I Put It In The Parking Light Position Or The On Position It Works Fine. What Is A Solution To The Problem Or The Best Way To...