How to diagnose brake fluid leak in Audi 80?

I have noticed that my Audi 80 is losing brake fluid, and I'm concerned about potential safety issues. How can I diagnose and fix this issue myself?

First, check for any visible leaks in the brake system, such as from the brake hoses, calipers, or master cylinder. Then, use a brake fluid tester to measure the level of contamination in the fluid, as this can indicate the source of the leak.

Another possible cause of brake fluid loss is a faulty brake master cylinder cap. Make sure it is securely tightened and check for any cracks or damage. If necessary, replace the cap to prevent further leakage.

It is important to note that brake fluid leaks can be a sign of more serious issues, such as worn brake pads or a damaged brake line. If you are unsure about the source of the leak, it is best to seek professional help for a thorough diagnosis and repair.