1th January 2025
What is the reason for brake booster leakage?
Component aging or damage
Diaphragm rupture: The diaphragm of the brake booster is a critical component. It constantly experiences pressure changes during operation, and after prolonged use, the diaphragm may age, crack, and ultimately rupture. For example, after many years of use, the rubber material of the diaphragm will lose its elasticity due to repeated stretching and environmental factors (such as high temperature, chemical erosion, etc.), resulting in cracks, and air will leak from these cracks.
Seal failure: There are multiple seals in the booster to ensure the airtightness inside the booster. If these seals wear, deform, or age, air leakage may occur. Like a sealing gasket, it plays a sealing role at the interface of the booster. Once it is deformed by compression or corroded in harsh environments for a long time, it cannot effectively prevent air leakage.
Pipeline issues
Vacuum tube rupture or looseness: The vacuum tube connecting the brake booster is a channel for transmitting vacuum. If the vacuum tube ruptures, external air will enter the system; If the vacuum tube joint is loose, it can also cause air leakage. For example, during the driving process of a vehicle, the vacuum tube may crack due to chassis bumps, collisions, or long-term vibrations, or the buckle of the vacuum tube may loosen, causing gaps between the tube body and the joint.
Shell damage
Cracks in the booster housing: The booster housing may crack due to external impact, long-term corrosion, or manufacturing defects. For example, in a minor collision accident of a vehicle, although the main components of the braking system appear undamaged on the surface, in reality, the booster housing may have developed subtle cracks, leading to air leakage.
Abnormal internal pressure
Excessive internal pressure in the booster: When the brake system malfunctions, such as poor oil return to the brake master cylinder, it may cause excessive internal pressure in the booster. Excessive pressure can cause excessive pressure on the sealing components of the booster, leading to damage and air leakage. For example, poor piston return of the brake master cylinder can prevent the pressure in the hydraulic system from being released in a timely manner and transmitted to the booster, causing the internal pressure of the booster to exceed the design limit.
