What are the reasons for exhaust brake failure?
1 Answers
Exhaust brake failure is related to the damage of certain components. Component damage leads to: Damage to the EVB exhaust pipe hardware, such as bracket plate fracture, cylinder push rod fracture, bracket plate connecting bolt detachment, bracket shaft fracture, cylinder fixing nut detachment, etc.; vehicle air pressure below 0.8MPa, air leakage at the cylinder air intake joint or pipeline, or air supply failure causing the cylinder to not receive air; butterfly valve jamming, preventing normal closure; air leakage in the EVB exhaust pipe cylinder, or wobbling of the EVB exhaust pipe butterfly valve. Inspection methods: Observe whether each component is visibly damaged and conduct exclusion checks. Check the EVB exhaust pipe for any obvious component damage, such as bracket plate fracture, bracket shaft fracture, cylinder push rod fracture, cylinder detachment, or wear of the support sleeve. If obvious damage is found, replace the EVB exhaust pipe directly. If none of the above issues are present, when the engine starts and pumps air to the dryer exhaust, the instrument should display a brake air pressure above 0.8Mpa, with no air loss or leakage in the air circuit. Otherwise, repair the relevant air circuit. After turning off the ignition switch, the exhaust brake solenoid valve should be powered for 15 seconds, with audible action and air passage sounds at the solenoid valve. After 15 seconds, the solenoid valve should power off, and its exhaust port should emit an exhaust sound. If no sound is heard, inspect the solenoid valve and its circuit. If sounds are present, check whether the cylinder push rod can reach the limit position during air passage and whether it returns during air release. If not, it indicates a fault with the EVB exhaust pipe butterfly valve.
