How to Troubleshoot a Car's Brake System?

I've been experiencing some issues with my car's brakes lately. Sometimes they feel spongy and other times they make weird noises. How can I troubleshoot these problems without having to take my car to a mechanic? Any advice would be greatly appreciated.

Firstly, I recommend checking your brake fluid level. If it's low, then you may have a leak in your brake system. You can also try bleeding your brakes to remove any air bubbles that can cause spongy brakes.

Another possibility is that your brake pads may be worn out. If this is the case, you'll need to replace them as soon as possible. Make sure to also check your brake rotors for any signs of damage.

If everything seems to be in good condition, then it could be an issue with your brake calipers. They may need to be serviced or replaced. It's best to take your car to a mechanic for this job.