You are here:

4 Wheel Drive/SUVs/Emergency Brakes in Automobiles.

Advertisement


Question
Dear Carl

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
Prashant,

In the USA, most vehicles emergency brakes, are now referred to as "parking brakes".  The reason for this, is that they are not reliable for actually stopping a moving vehicle, and there could be a liability from the manufacturer if they were called emergency brakes.

Many vehicles, such as the motorcycles, scooters, etc. have some sort of locking device on one of the tires, so that they are more secure when parked.  This is the same concept for automobiles or trucks.

Most of these brake systems, are nothing more than a cable device that operates the rear brake shoes, or a small pair of shoes in the case of disk brakes.
In an emergency, they can slow a vehicle down, but may not stop it if on a down hill grade, or incline.

Most modern cars have dual master cylinders for the brakes.  One for the front brakes, and one for the rear brakes.  The idea for this, is that if a brake goes out, and fluid is lost, you will still have some emergency braking on one end or another, depending on which end loses fluid.

I hope this helps answer your question.

Carl

4 Wheel Drive/SUVs

All Answers


Answers by Expert:


Ask Experts

Volunteer


Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles, and I suggest that you obtain a repair manual for mechanical problems and do some research before asking your question. Most mechanical questions can't be answered completely without looking at, or listening to the vehicle in person.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

©2016 About.com. All rights reserved.