Heavy trucks use air brakes, which must be carefully serviced, maintained and adjusted. Because of their weight, large truck brakes must routinely absorb and dissipate tremendous power when stopping or maintaining speed on down grades. Normal use of air brakes causes wear that makes routine inspection and adjustments necessary. Brake parts must be repaired according to strict criteria. The Warren Group engineers and reconstructionists can inspect and evaluate air brake systems on trucks to see if they were properly serviced or maintained.