GB/T 24926-2024 in English

Core parameters of driving brakes

• Braking force distribution: front axle ≥60% axle load, rear axle ≥55% axle load
• Force balance requirements: braking force difference between left and right wheels on the front axle ≤20%, rear axle ≤24% (when braking force ≥60% axle load)
• Upper limit of control force: hand control force ≤200N, foot control force ≤500N

Test speed classification

Dry Braking Test

Special test conditions

• Wet braking: 15L/h water jet is required, deceleration ≥ 60% of the reference value
• Thermal decay: After 10 consecutive brakings, MFDD ≥ 60% of the reference value
• High-speed braking: MFDD ≥ 5.8m/s² is required when Vmax>125km/h

Design optimization direction

1. When using a multi-circuit brake system, a red warning light must be configured, and the liquid level monitoring accuracy must reach 50% of the volume of the reservoir
2. The emergency brake device of the linkage brake system must be independent of the main brake energy transmission device
3. The friction plate thickness can be seen or measured, and the wear alarm threshold must be set in advance of the limit position

Test precautions

• The ambient temperature is controlled at 4-45℃, and the wind speed is ≤5m/s
• The initial temperature of the brake is in the range of 55-100℃, and is measured using a friction thermocouple
• Test channel width = 2.5m + vehicle width, slope ≤1%