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Brake steer is an undesirable phenomenon where a vehicle deviates to one side of the road during braking. Vehicle deviation i.e. drift causes driver discomfort, where a driver has to constantly apply Steering Wheel corrections while braking in order to safely maintain the desired path. In a particular model of commercial vehicle segment, an issue of unacceptable right-side vehicle drift during braking was observed which was making the drive of the vehicle unsafe for the driver. Aim of this paper is to analyse the probable causes of such a vehicle drift, to objectively measure actual vehicle drift during braking using a unique methodology. In this paper, the root cause of the brake steer is discussed and an improvement on the vehicle is proposed by changing kinematic hard points of suspension and steering linkage to reduce the brake steer to the limit that vehicle drift is almost eliminated, and vehicle becomes completely safe for the driver to drive.

Increasing fuel cost and constant pressure to maximize the fuel economy are forcing OEMs in India to look for alternate engine cooling mechanism which will minimize the power take off from the engine without affecting the system reliability. Aim of this paper is to analyze the potential benefit of incorporating Electro-magnetic fan (EMF) drive in terms of fuel economy and reduced load on the engine. These benefits were compared with the conventional viscous coupled fan drive system. In vehicle with viscous coupling, fan RPM is based on the ram air temperature at coupling face which takes heat from turbo-charged air and coolant. On the other hand, EMF drive have a separate controller and control the fan RPM based on the coolant temperature enabling itself to respond directly to changes in the heat load as compared to viscous coupling having indirect representation of Coolant/charged air temperature.