What Causes Brake Fluid Leakage?
2 Answers
Brake fluid leakage occurs due to issues with the brake fluid lines or loose screws. Methods to check for brake fluid leakage: Let the engine idle and keep the transmission shaft in the "neutral" position, then press the brake pedal and maintain constant foot pressure. If the pedal gradually sinks under constant pressure, it may indicate a leak in the hydraulic brake system. Additionally, a visual inspection can help determine if there's a brake fluid leak. First, check the fluid level in the master cylinder reservoir. Normal wear of friction linings may cause a slight drop in the reservoir's fluid level. If the reservoir level drops abnormally, it may trigger the brake warning light, indicating potential internal or external leaks in the hydraulic system. Next, inspect the connections of brake pipes and hoses for leaks. If leaks are found, check the torque of the fasteners or replace the pipes or hoses. Finally, examine the components connected to the brakes for damage and check if the protective covers of the calipers and wheel cylinders are leaking. If there is damage or leakage, reassemble or replace these components as necessary.
As an enthusiast who frequently tinkers with old cars, I've found that the most common causes of brake fluid leaks include rust and corrosion of brake lines, especially in older vehicles exposed to humid environments for extended periods, causing the outer layer of the pipes to peel and crack; aging rubber seals in calipers or wheel cylinders losing elasticity, leading to slow fluid seepage; and loose connections or worn gaskets creating gaps for leaks. I've encountered this issue before—seeing oil stains under the chassis is a red flag, as fluid leaks can make the brake pedal feel soft and weak, posing a serious danger if the brakes suddenly fail while driving. A simple DIY inspection method: regularly check underneath the car for oil stains or visually monitor the brake fluid level drop rate. Never delay—head to a professional shop immediately for part replacements. Applying protective coatings during routine maintenance can effectively prevent rust.
