What Causes the Clutch of Baojun 730 to Lose Pressure?
2 Answers
Dirty transmission oil, clutch spring failure, and spring aging are the reasons why the Baojun 730 clutch loses pressure. Dirty transmission oil: If the clutch oil is dirty and contains impurities, it can cause severe wear on the internal piston of the clutch master cylinder and may even clog the oil holes, leading to a loss of clutch pressure and poor clutch return. During driving, the oil passage may become blocked by air, and the working cylinder in the transmission may wear out, resulting in the clutch failing to return properly. Generally, the transmission oil should be replaced after 6 years or 60,000 kilometers of driving. Clutch spring failure: If the clutch return spring ages and loses its elasticity, it may cause the clutch pedal to not return properly. After purchasing the car, the clutch is carefully calibrated. However, poor driving habits or subpar workmanship can lead to loosening or deformation of the clutch pedal spring. If this is the case, simply replacing the spring with a new one will resolve the issue. Spring aging: In manual transmission cars, the clutch is frequently pressed during driving. Over time, this continuous use can cause the clutch spring to wear out and age, rendering it ineffective. In such cases, replacing the spring at a repair shop will restore functionality.
I just experienced this situation last month with my Baojun 730 - the clutch pedal felt completely soft and wouldn't return. The main issue lies in the hydraulic system: Internal leakage in the clutch master cylinder is the most common cause, where aging piston seals prevent the fluid from building pressure; secondly, it could be slave cylinder leakage, especially at the metal pipe joints which are prone to corrosion and seepage; another possibility is low fluid level in the reservoir or air entering the lines. In my case, it was master cylinder internal leakage, and even the hydraulic fluid had turned black. Remember to check the clutch disc wear while you're at it - though it won't cause loss of pressure, excessive wear can lead to incomplete disengagement. The entire repair took three hours, replacing the master cylinder and bleeding the system to restore proper pedal feel.
