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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 />

3

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