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Importance of the Boiling Point of break fluids
Brake fluid is one of several vital components that enable hydraulic brake systems to work effectively. Its function is to transmit the pressure applied on the master cylinder via the brake pedal to the brake cylinders of the vehicle's wheels. This is possible as fluids are generally incompressible. In order to guarantee the high quality of the brake system, it is crucial to determine the Boiling Point of these fluids. During braking, the temperature of the fluids can rise and when the Boiling Point of the brake fluid is exceeded, vapor bubbles are formed. Fluids containing vapor bubbles become compressible, which can affect to the performance of the braking system.
Different types of brake fluids and their Boiling Points
There are many types of brake fluids classified by their chemical basis:
- glycol-based (DOT 3, DOT 4 and DOT 5.1 types)
- silicone-based (DOT 5 types)
- and mineral oil (LHM)
One of the main differences separating the various classes of DOT fluids is the Boiling Point.
With this application note, you will learn how to determine the Boiling Point of DOT4, DOT5 and LHM brake fluids according to FMVSS No. 116 or related norms using METTLER TOLEDO’S Melting Point System MP80.
