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Efforts to overcome the effect of defective brake valves supplied by Bendix Commercial Vehicle Systems are progressing, with Navistar Inc. reporting that all its trucks delayed for repairs have now been shipped.

American Trucking Associations has defended the federal government’s moves to encourage the use of electronic onboard recorders among trucking fleets in a brief filed in federal court.

The Federal Motor Carrier Safety Administration will hear public comments at the Mid-America Trucking Show next month about the potential that drivers using electronic onboard recorders could be harassed by the carriers they drive for.

Officials of brake manufacturer Bendix Commercial Vehicle Systems said they are wrestling with the challenge of manufacturing and distributing replacement parts for a defective valve that could cause braking problems, which prompted federal and heavy-duty truck manufacturer recalls.

WASHINGTON — The Federal Motor Carrier Safety Administration will move forward with a host of developing rules and regulations regarding trucking this year, Administrator Anne Ferro said Tuesday.

A federal advisory committee studying electronic onboard recorders did not reach a consensus on the best way to transmit hours-of-service data from the truck cab to roadside inspectors, but did offer recommendations on items including safeguarding carrier and driver privacy.

The Senate Commerce Committee approved a bill to create a national freight program that its sponsors said would boost America’s global economic competitiveness, improve its mobility and promote energy conservation.