Bump steer is caused by unequal changes in which parameter?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Bump steer happens when the wheel’s toe angle changes as the suspension moves, so the front wheels steer themselves a bit as you go over a bump. The essential factor is unequal changes in toe during suspension travel—the toe changes with vertical motion, causing steering input even if you’re not turning the wheel. Camber can shift with travel and affect grip, but it doesn’t directly cause steering when hitting a bump. Tire pressure is not a travel-related factor, and “alignment shift” is too vague—bump steer is specifically about how toe changes with suspension movement.