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.
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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.
NICE
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