Transportation and Vehicle Safety/Emergency Brakes in Automobiles.

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Question
Dear Michael

http://auto.howstuffworks.com/auto-parts/brakes/brake-types/emergency-brakes.htm

1. Is Emergency Brakes Feature available in all automobiles ?. viz a. two wheeler scooters, motorcycles, bikes etc b. three wheeler viz autorickshaw, tempo c.four wheelers viz Cars, Jeeps, Trucks, Buses, Lorries etc ?.

2. In a rare case technically, the Emergency Brakes can also fail or not work in a automobile for the driver ?.

3. What are the real life situations where emergency brakes can be applied by automobile driver ?.

Thanks & Regards,
Prashant S Akerkar

Answer
Hi,

Thanks for asking.  My experience is limited mostly to four-wheel, non-commercial passenger vehicles, so I can't address your first question.  What I can say is that I had a lot of bicycles as a kid, and don't remember an emergency brake on any of them.  

Let me address your last question first.  The emergency brake (or parking brake) is a holdover from the days of manual transmission vehicles.  It's a mechanical component, a cable that runs from the handle to a single rear wheel.  It's purpose is to lock up that single wheel.  When a manual transmission vehicle is "parked", the driver typically places the car in either first gear or reverse, depending on the influence of gravity.  The parking brake then locks up a wheel to prevent the car from moving out of place.  In cars with an automatic transmission, the gear selection "Park" essentially locks the transmission and prevents the car from moving, making the parking brake redundant.  You may find drivers who have experience with manual transmission cars using the parking brake even with automatic transmissions.  It's habit, but it isn't really necessary.  Personally, I do it every time I park the car - one can never be too careful.

Beyond parking, another real-life situation that commonly utilizes the parking brake is in performance driving.  Using the emergency brake to lock up a single tire while throwing the steering wheel hard can cause the rear to break loose, inducing either an oversteer skid which can be controlled for drifting or a 180 degree direction change.  These maneuvers should only be performed in controlled settings by professionals.  It is not recommended to use the emergency brake for emergency braking, as it can cause the vehicle to slide out of control.  Rely instead on the car's main brakes.

The parking brake is traditionally a mechanical part, so of course it can fail.  If it does, it should be repaired as soon as possible by a qualified mechanic.  In some new cars, the mechanical brake has been replaced by an electric brake, activated by a button switch.  These, too, can fail, or may not work if the vehicle's battery has died.

Hope this helps!

Mike

Transportation and Vehicle Safety

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Michael Mercadante

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Questions on traffic safety, safe performance and operation of a motor vehicle in traffic, about driving with special needs, learning/behavioral/developmental disabilities, understanding vehicle laws, understanding safety equipment on vehicles, defensive and precision driving techniques, driver education and instruction and driver exam preparation.

Experience

Owner and sole driving instructor for Modern Driver Institute. Eight years in traffic safety research on contracts for NHTSA, FMCSA, AAA, MDOT and PennDOT. More than 1,000 hours as a professional driving instructor. Licensed driving instructor in the state of PA. Certified Defensive Driving Instructor for the National Safety Council. Precision driving for Hollywood and independent films. Expertise in virtual-reality driving simulators and teaching students with developmental/intellectual disabilities, traumatic brain injuries and more.

Organizations
member, Teen Safe Driving Coalition; member, PA Safe Kids coalition; service provider, PA Bureau of Autism Services; service provider, PA Office of Vocational Rehabilitation.

Publications
Perkasie News-Herald WonkaVision Magazine eHow.com MadeMan.com Philadelphia Zoo website Driver Training Services website Yahoo! Associated Content

Education/Credentials
Licensed driving instructor, PA Department of Education Certified Defensive Driving Instructor, National Safety Council B.A. in American History (cum laude), Temple University (earned 2007) M.S. in Psychology, specialization in Educational Psychology (2015) Ph.D in Psychology, specialization in Educational Psychology (expected 2019)

Awards and Honors
Scientific Paper of the Year (2003), Association for the Advancement of Automotive Medicine.

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