What Causes Soft Brakes?

1 Answers
CalvinLee
07/29/25 6:14pm
There are multiple reasons for soft brakes in vehicles, detailed as follows: 1. Brake fluid has not been replaced for a long time. The recommended replacement interval for brake fluid is every 2 years or 50,000 kilometers. Brake fluid has the property of absorbing moisture from the air. If not replaced in time, excessive water content inside can lead to vapor formation, creating air in the brake lines, which affects braking performance and results in soft brakes. 2. Air in the brake lines. During brake system maintenance, if air in the brake lines is not completely purged, it can cause soft brakes. To resolve this, the brake system lines need to be bled. 3. Brake master cylinder piston leakage. Over time, the rubber seals in the brake master cylinder piston may degrade, causing leakage and oil return, leading to soft brakes. 4. Brake caliper leakage. This prevents the brake system from maintaining sufficient oil pressure, resulting in soft brakes. 5. Brake pad material issues. It is advisable to use branded brake pads and avoid cheap, unbranded ones. 6. Recently replaced brake pads. The gap between newly installed brake pads and discs may not be perfectly matched yet, causing temporary soft brakes.
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