![]() It is also much easier to protect the brake mechanism from the outside environment, and protect it from water, dust, and oil. The wheels don't enclose the brake mechanism allowing greater flexibility in wheel offset, and placement of suspension members. The suspension does not have to resist twisting when the brakes are applied. The benefit of such a system is primarily the reduction of unsprung weight which improves handling and ride. Driven wheels already have shafting (or chains in older vehicles) which serve this purpose so there is no penalty for them, but undriven wheels require a similar mechanism which is then called a brake shaft. This then necessitates a means of transferring braking torque from the brake mechanism to the wheel, which is capable of operating despite the relative movement between body and wheel. ![]() This is done to move the weight of the braking mechanism from being carried by the wheels directly as unsprung mass, to being carried indirectly by the wheels via the suspension as sprung mass. Inboard brakes for early racing cars have rarely used drum brakes, although nearly all inboard brakes date from the disc brake era.Įxcepting the case of vehicles with beam axles and vehicles having no suspension, in practice it is normal for inboard brakes to be mounted rigidly with respect to the body of the vehicle, often to the differential casing. A rare few rear wheel drive racing cars (e.g., the Lotus 72) have also used inboard front discs, accepting the need to provide a front brake shaft to gain the overall unsprung weight and braking torque advantages. Most have thus been used for rear-wheel drive cars, although four-wheel drive and some front-wheel drives have also used them. ![]() Inboard brakes are fitted to a driven axle of the car, as they require a drive shaft to link the wheel to the brake. Its main advantages are twofold: a reduction in the unsprung weight of the wheel hubs, as this no longer includes the brake discs and calipers and braking torque is applied directly to the chassis, rather than being transferred to it through the suspension arms.
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