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This paper presents an overview of the LucasVarity Vehicle Simulation Laboratory and its capabilities and benefits to the company's development of brake and brake control systems for the automotive industry. LucasVarity has been using simulation in its product development process since 1991. Two types of simulation are currently used: open loop and closed loop. The Open Loop Simulator (OLS) is a sensor signal design tool and real-time transmitter used primarily to test brake control system algorithms. Closed loop simulation (CLS) includes two levels: non-real-time desktop simulation (CLSDT) or real-time with hardware in the loop simulation (CLSH). Both levels use a vehicle model, designed by LucasVarity engineers, which is currently solved for eighteen degrees of freedom representing three-dimensional vehicle dynamics. Hardware in the loop simulation is performed on the CLSH and may include a brake fixture mounted in a laboratory hydraulic chamber or an entire vehicle.