Anti-Lock Braking Systems Branden L Jones, CSP, OHST Manager - EH&S Texas New Mexico Power Fort Worth, Texas Pop Quiz • Does Anti-Lock Brake S t B k System (ABS) usage follow conventional driver training? • Is ABS usage on cars and trucks the same? • Do you address ABS in Defensive Driving Courses? g Anti-Lock Braking Systems Quiz Answers • Does Anti-Lock Brake S t B k System (ABS) usage follow conventional driver training? • Is ABS usage on cars and trucks the same? • Do you address ABS in Defensive Driving Courses? g • NO • NO • ?? Anti-Lock Braking Systems Mini Train-the-Trainer Train the Trainer • Basic Functions of ABS Systems • Driver Instructions for Cars and Light Trucks • Di Driver I t ti Instructions for Heavy Trucks • Reso rces for Resources Defensive Driving Program Integration Anti-Lock Braking Systems Basic Functions of ABS • Physics 101: Static Friction is Greater than Moving Friction • ABS IS Computer Controlled Brake Pedal “Pumping” Pumping • ABS Allows the Driver To Maintain Control During Hard Braking g Anti-Lock Braking Systems Vehicle ABS System • Speed Sensors on Wheels are Monitored by On Board Computer • Radical Speed Differences Trigger ABS Action • ABS “Pumps” the Pumps Brakes 18 Times p per Second Anti-Lock Braking Systems Vehicle ABS System • ABS Systems “Counter-Intuitive” Operations – G i di S Grinding Sounds d from All Wheels – Pulsating or Soft Brake Pedal – Driver Can Still Steer (with Reduced Effect) Anti-Lock Braking Systems Video Clip • “America Brakes for Safety” – ABS Education Alliance Anti-Lock Braking Systems Driver Education (Cars) • STOMP on the Brake Pedal • STAY on the Brake Pedal with Steady Pressure • STEER to Avoid Collision • “Pumping” the Brake Pedal STOPS ABS Systems from Operating Properly (ON-OFF-ON-OFF-ON-OFF) f O ti P l (ON OFF ON OFF ON OFF) Anti-Lock Braking Systems Video Clip • “America Brakes for Safety” – ABS Education Alliance Anti-Lock Braking Systems 10 Driver Education (Trucks) • Single Vehicle Configuration • All Wheels – STOMP STAY, STOMP, STAY STEER • Tractor - Trailer Configuration • Any Combination – Brake Steadily and Evenly • Back-off Brakes to Maintain Control Anti-Lock Braking Systems 11 Video Clip • “ABS Driver Training” – US DOT Anti-Lock Braking Systems 12 ABS Maintenance Issues • Most Common Issues – Loose Wiring – Wh l S Wheel Speed S d Sensor Pickup and Calibration • Other Possibilities – Modulator Valve Failure – Electronic Control Unit Failure Anti-Lock Braking Systems 13 Video Clip • ABS Maintenance – US DOT Anti-Lock Braking Systems 14 Driver Training Integration • ABS Systems Differ from Traditional Braking Training • Items to Incorporate – Basic Function of ABS Systems – How to Drive and Brake with ABS – What Happens when ABS Engages – E h i St i ! Emphasize Steering! Anti-Lock Braking Systems 15 Educational Resources • Educational Resources – Super Cheap!!! • ABS Education Alli Ed ti Alliance – Videos, Trainer Packages, Brochures, etc – http://www abs http://www.abseducation.org/index.html • Federal Motor Carrier Safety Administration – Videos, Cirriculum – http://www.fmcsa.dot.gov/sa fetyprogs/brakesaft.htm fetyprogs/brakesaft htm Anti-Lock Braking Systems 16 Questions? Thanks! ... Control Unit Failure Anti-Lock Braking Systems 13 Video Clip • ABS Maintenance – US DOT Anti-Lock Braking Systems 14 Driver Training Integration • ABS Systems Differ from Traditional Braking Training... Steadily and Evenly • Back-off Brakes to Maintain Control Anti-Lock Braking Systems 11 Video Clip • “ABS Driver Training” – US DOT Anti-Lock Braking Systems 12 ABS Maintenance Issues • Most Common Issues... Driver Can Still Steer (with Reduced Effect) Anti-Lock Braking Systems Video Clip • “America Brakes for Safety” – ABS Education Alliance Anti-Lock Braking Systems Driver Education (Cars) • STOMP on