This apparatus has been developed specificallyfor Motor Vehicle Mechanics and Motor Vehicle Technicians Courses. It providesa means of demonstrating the difference in braking torque between leading (Primary)and trailing (Secondary) shoe braking systems and the effect on the brakingsystems and the effect on the braking torque of the various combinations ofleading and trailing shoes. When the two shoes are linked together, the selfenergising action can be demonstrated. The apparatus is suitable for use in thelaboratory and may be used by the Students to carry out simple experiments toinvestigate the relationship between actuating forces and the braking torquesand for the determination of the coefficient of friction between the brakelining and the drum. Two shoes with short brake linings are provided, additionalshoes with full linings are available should these be required. For moreadvanced work, a special shoe may be supplied, fitted with an adjustable liningthis enables the Student to investigate the effect on the braking torque whenthe pressure point on the brake shoe is displaced relative to the pivot point.The apparatus is self contained and may be wall mounted or fitted to the UniversalBench Mounted Frame.