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NEWS | March 2, 2022

FMTV: Watch for Pests in Exhaust Ports

FMTV in convoy
Photo by Sgt. Paige Behringer
Dear Editor,

While conducting maintenance on our FMTVs, we got readings that led us to believe an anti-lock braking system (ABS) valve was bad on one of our FMTV’s wheels.

The issue, believe it or not, was mud daubers (wasps). We’ve run across this problem several times. Mud daubers have occasionally constructed nests inside the exhaust ports of the modulating valves, sealing them closed, which could cause brakes to release slowly and, in some cases, generate faulty readings in the system.
Mud dauber nest inside exhaust port
Mud dauber nest inside exhaust port
In regions where mud daubers are common, it’s a good idea to check these exhaust ports more often because they can build a nest in a day.

Walter Johnson
TACOM FMX, Maintenance Support
Editor’s note: Another great tip, so bee-careful! We appreciate it and thanks.
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