Transport Topics Online
The Newspaper of Trucking and Freight Transportation
Welcome  Guest  Log In         
4/23/2012 8:00:00 AM Write a Letter to the Editor Write a letter to the Editor

Opinion: New Stopping Distances, New Technology

By James Clark

Director of Engineering

TMD Friction Inc.

This Opinion piece appears in the April 23 print edition of Transport Topics. Click here to subscribe today.

I’m proud to be a member of the North American heavy-truck supplier community. Together, we’ve made significant strides in Class 8 truck brake safety, but not since the introduction of non-asbestos brake linings more than 20 years ago has the heavy-duty industry seen technological changes to brakes as significant as those we are experiencing today.

Two new products in particular — high-torque drum brakes for the new reduced stopping distance regulations and air disc brakes — have hit U.S. roads recently, and that means it’s no longer “business as usual” when it comes to selecting replacement linings. Every maintenance manager needs to understand these new technologies and to know how to make sure he or she has the information needed to avoid costly mistakes in selecting replacements.

Over the years, we’ve seen the development of brake-related technologies ranging from automatic slack adjusters to anti-lock braking systems. In the normal way of things, new technologies are introduced to the market by safety-conscious suppliers, safety-conscious truck manufacturers and safety-conscious fleets. Once they have proved reliable, standards are established and regulations created.

That’s where we are now with aftermarket brake linings — fleets are using them, but we lack regulations to standardize and control their performance. That means there are no effective safeguards to ensure that an aftermarket lining can stop a Class 8 vehicle within the same distance as the original-equipment linings.

A new truck’s brakes must pass two legal requirements as defined by Federal Motor Carrier Safety Standard No. 121 — a brake dynamometer certification and a full-vehicle stopping-distance test. This regulation includes torque output performance, fade and recovery characteristics and fully loaded stopping distance tests from 60 mph.

2 3 Next >>



Follow Transport Topics on Subscribe to get up to the minute news briefs and more from our feeds. RSS Twitter Twitter Facebook Facebook

© 2012, Transport Topics Publishing Group. All rights reserved.


  RELATED ARTICLES

 
LATEST NEWS



 
LATEST JOBS
Follow Us

Newsletters

TTExpress
This free daily newsletter delivers the latest headlines.

TT Executive Suite
This subscriber-only newsletter program tailors your news.

Services

Advertising




© American Trucking Associations, Inc., All Rights Reserved TTNews.com Privacy Statement