4s sells only the low prices of Elantra brakes, the exclusive manufacturer of the Elantra brakes. The braking currently have disc brakes and drum brakes, older vehicles are Qianpanhougu. The car now a lot of before and after the disc brake. Disc brake drum brake cooling, high-speed braking, not prone to heat fade, so its high-speed braking effect. However, in low-speed cold gate, the braking effect than drum brakes. The price is more expensive than the drum brake. So now, many high-class cars overall brake, while the average car uses Qianpanhougu, and relatively low-speed, large power trucks, buses and require the system still use drum brakes.