As a sporty SUV, the Jetour DASHING requires not only powerful power but also a reliable braking system for safety. Its front brake discs, front brake calipers, and vacuum booster are designed to meet the demands of smooth braking during urban commuting while also handling the intense loads of aggressive driving. Through sophisticated construction and high-quality materials, every brake stroke is precise and stable.
Front Brake Discs: The "Brake Core" with Efficient Heat Dissipation
The Jietu DASHING's front brake discs feature a ventilated, grooved design, a common feature on sports vehicles, designed to enhance braking efficiency and stability. With a diameter of 320mm and a thickness of 28mm, this larger disc diameter compared to typical family SUVs translates to a greater friction surface, distributing pressure and reducing localized wear under the same braking force.
The discs are constructed from a high-strength cast iron alloy with added carbon and silicon, achieving a hardness of HB200-220 and over 20% greater wear resistance than ordinary cast iron. The key feature is its ventilation structure: 32 spiral ventilation channels are located within the brake disc. As the wheels rotate, air flows through these channels at high speed, creating a "natural cooling" effect and quickly dissipating the heat generated during braking. This design effectively reduces the risk of "thermal fade"—preventing braking performance degradation caused by excessive brake disc temperatures during continuous downhill driving or frequent braking.
The surface scribing is also practical. Three evenly spaced circular grooves scrape away dust, debris, and moisture from the brake pad surface, keeping the friction surface clean. In rainy conditions, the grooves quickly drain rainwater, preventing the "water film effect" that can cause slippage and ensuring stable braking in wet conditions. Furthermore, the chamfered edges of the brake disc reduce friction with the brake pad and minimize any unwanted squeal during braking, ensuring a balanced balance of performance and comfort.
Front Brake Caliper: A "Brake Executor" for Precise Force
The front brake caliper is a key component that converts hydraulic energy into mechanical force. The JETOUR DASHING utilizes a single-piston floating caliper design. While its structure is relatively simple, it has been optimized for outstanding performance. The caliper housing is constructed from aluminum alloy and forged for high strength and light weight, reducing weight by approximately 30% compared to steel calipers, helping to reduce unsprung mass and improve vehicle handling responsiveness.
The piston diameter is 54mm, providing ample thrust and ensuring a tight fit between the brake pads and the disc. The seals within the caliper are made from high-temperature fluororubber, capable of withstanding temperatures of 180°C. They maintain a tight seal even under prolonged, high-intensity braking, preventing brake fluid leakage. The caliper surface is electrophoretically coated, creating a uniform protective film that resists corrosion, even in humid or dusty environments. To enhance the sporty look, the brake calipers feature a striking red paint job, creating a striking contrast with the silver brake discs. Peering through the wheel rim creates a striking visual impact. Furthermore, the caliper's mounting position is precisely calibrated to ensure a perfect fit between the brake pads and discs, reducing uneven wear and extending the life of the brake components.
Vacuum Booster: A Power-Saving and Efficient "Brake Amplifier"
The vacuum booster is a crucial component connecting the brake pedal to the master cylinder. Its function is to amplify the driver's pedal force, making braking easier and more effortless. The JETOUR DASHING's vacuum booster has a diameter of 200mm and a 5:1 assist ratio. This means that for every 1N of force applied by the driver, the booster can amplify it to 5N. This reduces foot fatigue in urban traffic and allows for quick and sufficient braking force during emergency braking.
The booster's internal dual-diaphragm structure provides improved sealing compared to a single-diaphragm design, increasing vacuum retention by 40%. Its vacuum source is derived from the engine's intake manifold, supplemented by an electric vacuum pump. If insufficient vacuum is detected (e.g., during extended idling, frequent braking, or engine stall), the electric vacuum pump automatically activates to replenish the vacuum, ensuring adequate braking force in all driving conditions.
The connection between the booster and the brake pedal has been finely tuned, resulting in a 140mm pedal travel. The first half of the stroke is soft, suitable for gentle everyday braking; the second half offers increased rigidity, providing more precise braking force control for demanding driving. This "progressive" pedal feedback allows users with different driving styles to quickly adapt, ensuring both comfortable urban commuting and precise handling on mountain roads or highways.
In addition, the vacuum booster is integrated into the brake master cylinder, featuring a dual-chamber design. Even if one chamber fails, the other can still provide partial braking force, enhancing the redundancy of the braking system. The master cylinder's oil outlet has been optimized to ensure smooth brake fluid flow, minimize pressure loss, and deliver more direct braking force.
Although the front brake discs, front brake calipers, and vacuum booster on the JETOUR DASHING have distinct structures, they work together to form a highly efficient braking system. The ventilated, grooved brake discs provide efficient heat dissipation and stable friction, the single-piston brake calipers precisely transmit braking force, and the vacuum booster amplifies the operating force. Together, these three ensure precise, stable, and effortless braking. For those seeking a sporty driving experience, this braking system not only meets the demands of smooth daily commuting but also provides reliable safety during intense driving, ensuring confidence in every acceleration and braking.
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