Inboard Braking system

• The disc brakes are mounted on the chassis of the vehicle, rather than directly on the wheel hubs

• They are fitted to a driven axle of the car, as they require a drive shaft to link the wheel to the brake.

The benefit of such a system is primarily the reduction of unsprung weight which improves handling and ride. The suspension does not have to resist twisting when the brakes are applied. The wheels don't enclose the brake mechanism allowing greater flexibility in wheel offset, and placement of suspension members. It is also much easier to protect the brake mechanism from the outside environment, and protect it from water, dust, and oil. Of secondary importance is flexible brake pipes are avoided; rigid pipes allow increases in brake fluid pressure, allowing for a smaller disc to manage a given braking torque.

The mechanical disadvantages are largely those of added complexity. Undriven wheels require a brake shaft. Mounted inboard, it is more difficult to arrange for cooling air to flow over the rotor and air ducting can be required to prevent brake fade.

ADVANTAGES

• A reduction in the unsprung weight of the wheel hubs, as this no longer includes the brake discs and calipers; Also, braking torque applies directly to the chassis, rather than being taken through the suspension arms.
• The suspension does not have to resist twisting when the brakes are applied. 
• The wheels don't enclose the brake mechanism allowing greater flexibility in wheel offset, and placement of suspension members.
•  It is also much easier to protect the brake mechanism from the outside environment, and protect it from water, dust, and oil.
• Secondary importance is that flexible brake pipes are avoided; rigid pipes allow increases in brake fluid pressure, allowing for a smaller disc to manage a given braking torque.

DISADVANTAGES

• The mechanical disadvantages are largely those of added complexity. Undriven wheels require a brake shaft. Mounted inboard, it is more difficult to arrange for cooling air to flow over the rotor and air ducting can be required to prevent brake fade.
• There can be practical difficulties in servicing the brake mechanism. Instead of simply removing a wheel to renew pads and discs, the vehicle may need to be jacked up, so a mechanic can work underneath the vehicle. 
• Additionally renewing brake discs can require dismantling the half axle. This greatly discourages their use in motor-sport and the additional time makes for greater labour cost when servicing these parts.