Car pulls to left when braking

Listen to abodyjoe, I had a 70 Cutlass that use to pull to the right a bit when braking, I figured it was no big deal, car still stopped and it wasn't pulling huge. One day I had too slam the brakes on, car pulled so hard it mounted the curb and came to a stop on the lawn in front of some company, lucky it was a commerical area and not a residental.