WASHINGTON, D.C. --- Daimler Trucks is issuing a series of Thomas Built school bus recalls.

One such recall affects certain model year 2008 through 2011 Thomas Built Saf-T-Liner C2 school buses and FCCC B2 chassis manufactured from June 1, 2007 through Sept. 28, 2009. Fasteners used to connect the rear suspension spring to the suspension hanger bracket may not have been torqued to specification, according to the National Highway Traffic Safety Administration. Under-torqued fasteners may become loose and potentially fall out. Loose or missing fasteners may allow the rear suspension to become misaligned, increasing the risk of a crash. 

Dealers will inspect and adjust the fasteners as required. Damaged fasteners will be replaced. Repairs will be made free of charge. 

This safety recall is expected to begin in February. Owners may contact Daimler Trucks' toll-free at (800) 547-0712. The safety recall campaign number is FL-567.

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Another recall involves certain model year 2008 through 2010 Thomas Built Saf-T-Liner C2 school buses and FCCC B2 chassis manufactured from Oct. 1, 2007 through Aug. 10, 2009, equipped with a Cummins ISB CM2150 J1939/1587 engine control unit, Bosch hydraulic pin-slide front brakes, and a Webasto 17k BTU coolant heater.

The front right-hand crossover brake line may have been secured using shorter offset than specified clamps, potentially allowing the brake line to rub on the surrounding components. This may lead to a brake fluid leak. Continued contact between the brake line and the surrounding components may lead to a loss of brake fluid and reduce braking performance, potentially resulting in a vehicle crash, the NHTSA said.

Daimler Trucks will notify owners. Dealers will inspect the units, and clamps with shorter offset than specified will be replaced with longer offset clamps. Any brake lines found to be damaged will be replaced. Repairs will be done free of charge. The safety recall is expected to begin this month. The safety recall campaign number is FL-568. 

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In addition, Daimler Trucks is recalling certain model year 2006 through 2011 Thomas Built Saf-T-Liner C2 school buses built on FCCC B2 chassis manufactured from Oct. 15, 2004 through Nov. 25, 2009, equipped with Kongsberg Automotive adjustable brake pedals. The adjustable brake pedal arm may loosen allowing the arm to rotate around its shaft and swing in front of the accelerator pedal, reducing braking function. A loose brake pedal increases the risk of a crash. The safety recall began on Dec. 22, 2009. This safety recall campaign number is FL-569. 

Another Daimler Trucks recall involves certain model year 2006 through 2011 Thomas Built MVP-EF school buses manufactured from Feb. 15, 2005 through Nov. 23, 2009. The accelerator pedal may become wedged against the scuff plate and become stuck in full throttle position. A stuck accelerator pedal may increase the risk of a crash. Daimler Trucks will notify owners and dealers will raise the accelerator pedal free of charge. This safety recall is expected to begin in February. The safety recall campaign number is FL-570.