Courses of spongy brake pedal?

1. Air in the brake lines: Air bubbles can get trapped in the brake lines, causing a spongy feeling in the brake pedal. This can happen if the brake system is not properly bled after maintenance or repair work.

2. Worn brake pads or rotors: If the brake pads or rotors are worn out, they may not be able to provide enough friction to stop the vehicle effectively, leading to a spongy brake pedal.

3. Brake fluid leak: A leak in the brake system can cause a loss of hydraulic pressure, resulting in a spongy brake pedal. Check for any signs of fluid leakage under the vehicle or around the wheels.

4. Faulty brake master cylinder: The master cylinder is responsible for generating hydraulic pressure in the brake system. If it is faulty or worn out, it may not be able to build up enough pressure, causing a spongy brake pedal.

5. Contaminated brake fluid: If the brake fluid is contaminated with water or air, it can affect the performance of the brake system and lead to a spongy brake pedal. It is important to regularly flush and replace the brake fluid to prevent this issue.