Measurement of Brake Fluid Boiling Point

Abstract The study focuses on measuring the boiling point of brake fluid. The research is based on a qualitative analysis of brake fluid samples taken from randomly selected vehicles. A total of 100 different vehicles with varying ages and mileage were included in the examination process. Using a device designed to measure the boiling point of brake fluid, indicators that directly reflect the quality of the brake fluid were evaluated, as it is one of the main factors affecting vehicle safety in road traffic. In further sections, the research focuses on how the boiling point changes depending on the vehicle’s age and mileage. The results showed that the boiling point of glycol-based fluids significantly decreases with moisture absorption, with older vehicles and vehicles with higher mileage tending to have a lower brake fluid boiling point. Comparing different sampling locations also revealed that brake fluid in the reservoir often has a higher boiling point than fluid at the brake calliper, indicating a higher level of contamination at the brake calliper. In comparison, brake fluid samples from reservoirs exhibited higher boiling points than those from brake callipers, with differences of up to 20 °C in some cases. Of the 39 vehicles sampled from both locations, 59% of the samples were satisfactory at all points, 13% met the standard only in the reservoir, and 28% were unsatisfactory at any sampling point. The results emphasise the necessity of regular inspections and highlight that boiling point checks at the brake calliper could reveal risks otherwise undetectable from reservoir-only testing.