No matter how the brake discs is processed, it will inevitably oscillate along the wheel axis after being installed on the wheel, just like how high-quality rims need to be dynamically balanced after being fitted with tires. This phenomenon will be exacerbated by thermal expansion. Once the swing phenomenon occurs, it will have a great reaction force to the two inner and outer brake pads, affecting the braking effect, and will also cause wheel shake in severe cases.
Higher-level brake discs have a split design. They are called floating brake discs. Floating brake discs have better heat dissipation performance. For the floating brake cylinder used by the original factory model, the brake cylinder only There is a piston on one side. When the brake is pressed, the piston pushes the brake pad on one side to the brake disc, and then the outer friction pad is also clamped by the movement of the floating pin. At this time, the caliper can still perform a certain amount along the wheel axis. The amount of lateral movement to compensate for the impact of shoe wear and disc swing. However, the modified multi-piston brake cylinders have adopted a fixed counter-cylinder pump design. After replacing the multi-piston cylinders, the cooperation of floating brake discs is even more needed to solve the swing problem.