What Causes Brake Fluid Leakage After Replacing Brake Pads and Rotors?

[SanElisa]

Brake fluid leakage after replacing brake pads and rotors is caused by either excessive brake fluid or excessive clearance in the wheel cylinders. Excessive Brake Fluid: During the previous brake fluid replacement, slightly too much fluid was added. As the brake pads wear, the brake fluid level decreases. If the brake fluid is replaced, the new fluid level may not exceed the "MAX" mark but could still be higher than before. Subsequently, when replacing the brake pads and compressing the wheel cylinders, the "excess" brake fluid may be forced out. Excessive Clearance in Wheel Cylinders: Compressing the wheel cylinders of all four wheels at once can cause the brake fluid level to rise excessively. Avoid resetting all four wheel cylinders simultaneously. Instead, replace the brake pads on one or two wheels first and check the brake fluid reservoir level. After the fluid level stabilizes, proceed with the remaining wheels. If all four wheel cylinders are compressed at once, the clearance in each cylinder may exceed the space required for the new brake pads, causing too much brake fluid to flow back and overflow from the reservoir.