inside cover - Commercial Vehicle Safety Alliance
inside cover - Commercial Vehicle Safety Alliance
inside cover - Commercial Vehicle Safety Alliance
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Guardian<br />
Standard Process for a Controlled Brake Application<br />
Will Impact Brake Failures, Improve Operation Costs<br />
According to the statistics, true trailer<br />
air brake testing in the shop is not happening.<br />
CVSA’s Executive Director<br />
Stephen F. Campbell in his recent article<br />
‘Put Your Foot Down on Faulty Brake<br />
Systems’ identified the seriousness of<br />
poor brake maintenance. Brake problems<br />
were present in 29.4 percent of<br />
large truck crashes and 56.6 percent<br />
vehicle out-of-service violations including<br />
slack adjustments.<br />
These numbers suggest brake maintenance<br />
in the shop is a major contributor.<br />
Too often the trailer brake inspection<br />
consists of connecting the nonregulated<br />
shop air to the trailer and listening<br />
for air leaks. The non-regulated<br />
air ranging from 60psi to 150psi does<br />
not ensure consistency, creating additional<br />
problems especially with an<br />
excessive air pressure. Hearing an air<br />
leak in a noisy shop is not sufficient<br />
especially when there is an internal air<br />
leak or multiple small air losses.<br />
Applying the same pressure to both the<br />
emergency and service air lines will not<br />
identify an internal air leak of seals and<br />
valves.<br />
Many issues such as restricted air<br />
supply, bent slack adjustment rods, and<br />
non-functioning mechanics are not<br />
observed with a static air application.<br />
Brake operation on multiple axles is not<br />
observed with a single application. Add<br />
to the above issues, making automatic<br />
slack adjustments with applied air damages<br />
the mechanism.<br />
The hidden effects are marginal<br />
brake applications with excessive brake<br />
and tire wear.<br />
The solution is simple:<br />
• Apply regulated air matching the tractor<br />
applications (110psi and 90psi);<br />
• Have separate shut-off valves for<br />
emergency and service air for the air<br />
test;<br />
• Use quality air gauges for emergency<br />
and service air; and,<br />
• Cycle air applications at the axle to<br />
observe brake operations.<br />
Developing a standard process for a<br />
controlled brake application will make an<br />
impact on the road numbers and improve<br />
the fleet operation costs.<br />
Bob Blair<br />
bob@lite-check.com<br />
vehicle, to comply with the laws in many<br />
states that require hands free devices and to<br />
enable our drivers to use two hands on the<br />
steering wheel.<br />
It is our goal in the DiSilva organization<br />
to provide the safest, most productive<br />
transportation company in the country<br />
and we continue to look for positive ways<br />
to support our drivers while driving our<br />
trucks on today’s busy highways. We are<br />
encouraging our drivers to take advantage<br />
of this opportunity and use it to improve<br />
their focus while on the job.<br />
Brian J. Libby, Corporate Compliance<br />
Manager, The DiSilva Companies<br />
CVSA’s Guardian welcomes your letters<br />
and comments. To submit a letter send<br />
an email to communications@cvsa.org<br />
or write to CVSA, c/o Guardian,<br />
1100 17th Street, NW, Suite 803,<br />
Washington, DC 20036.<br />
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