Test DOT3, DOT4, DOT5.1 Brake Fluid Tester. Yellow light indicates the fluid is not so good, the water content is above 2.5%, you can choose to change brake fluid.
Wagner FC133301 Brake Fluid for Braking Stopping Cylinder Hydraulic nx
2 PCS Brake Fluid Tester, Brake Fluid Moisture Tester, Brake Fluid Liquid Tester
Brake Fluid Tester, Brake Oil Tester, Brake Fluid Tester Pen
