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The aim of present work was preparation of advanced material magnetorheological (MR) fluids and the basic properties of synthetic MR fluids, as their response to an external magnetic field and Magnetorheological Fluid (MRF) Brake were developed that has performance advantages over the conventional hydraulic brake. MRF Brake employed with the magnetic field sensor to measure the magnetic field strength and dynamometer to test the braking torque. In the present work, three samples of Magnetorheological Fluid were prepared. The sample having higher percentage of magnetic particle (36% by wt. of carbonyl Iron particle) were selected to investigate the Braking torque of MRF Brake at low speed ranges (350rpm to 550 rpm) applying and without applying magnetic field under the current range of 0A to 2.6A. The Total Braking torque of MRF Brake was measured which is the sum of viscous torque without magnetic field applied and torque produced due to magnetic field. First, viscous torque without applying the magnetic field (at B=0) at different speeds were measured. Secondly, total maximum braking torque at specified range of speeds was measured as 16.78 Nm, 18.59 Nm and 19.58 Nm respectively under 0A to maximum current 2.6 Ampere. And hence, magnetic torque is the difference between Total Braking torque and viscous torque, corresponding current range up to 2.6 A and speed range were measured as 0 Nm to 18.35 Nm. The Transmitting torque generated in MRF Brake was still far less than that of a conventional hydraulic Brake, which indicates that a radical change in the basic Brake configuration is required to build a feasible automotive MRF brake.

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