Air in the brake system can make your brake pedal feel spongy and vague. You should flush the fluid every two or three years, ...

Clean any dirt or grime off the master cylinder reservoir cap with the shop towels. Use brake fluid test strips or a pen ...

It could be that it is not at the optimal fluid level or that the fluid has been contaminated. Brake fluid contains a main ingredient along with protective additives. The main ingredient in brake ...