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AV-SCANNER / Accessory guides / Tyres, brakes and cooling
This guide gives motorists and working mechanics a complete, practical procedure for using a brake fluid tester to measure moisture content and judge whether the fluid still protects the hydraulic system. It explains the different tester types, how to connect and operate them safely, and how to interpret readings against the vehicle manufacturer's limits. Worked examples and real diagnostic jobs show how to turn a percentage or LED result into a clear recommendation for the customer. After reading, you will be able to test brake fluid confidently, avoid common false readings, and know when the job belongs in a professional workshop.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 12 sections as a branded PDF to use in the workshop.
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