The correct spelling for the liquid used in hydraulic braking system is "brake fluid" /breɪk fluːɪd/. The word "brake" refers to the device that stops or reduces the speed of a vehicle while "fluid" means a substance that flows freely and can take the shape of its container. The IPA transcription shows that the first syllable "brake" is pronounced with a long vowel /eɪ/ sound and the second syllable "fluid" with a short /uː/ sound followed by the /ɪd/ ending.
Brake fluid is a highly specialized hydraulic fluid used in automotive braking systems to transmit force from the brake pedal to the brake calipers or wheel cylinders. It is a vital component of the braking system that ensures efficient and responsive braking performance.
The main function of brake fluid is to convert the mechanical force applied on the brake pedal into hydraulic pressure, which then forces the brake pads or shoes against the rotors or drums, creating friction to slow down or stop the vehicle. It operates under extreme conditions, such as high temperatures and pressures, to ensure reliable and consistent braking.
Brake fluid is typically composed of glycol-ether-based or silicone-based compounds due to their exceptional hydraulic properties and ability to resist degradation and corrosion. These compounds have high boiling points to prevent vaporization and a low freezing point to maintain fluidity even in extreme cold.
The performance characteristics of brake fluid are critical for safe vehicle operation. It must have excellent heat resistance to avoid boiling and vapor lock, as well as low compressibility to ensure a firm and prompt braking response. Additionally, brake fluid must also possess excellent lubricating properties to protect various components of the braking system, such as seals and pistons.
It is essential to regularly inspect and maintain brake fluid to ensure optimal performance and safety. Over time, brake fluid can absorb moisture, compromising its efficiency and promoting corrosion within the braking system. Therefore, proper brake fluid maintenance, including regular flushing and replacement, is necessary to maintain the integrity and effectiveness of the braking system.
The word "brake fluid" derives from the Middle English word "brak" or "brake", which meant to stop or control the motion of something. It stemmed from the Old English word "bræc", meaning to break or fracture. The term "fluid" comes from the Latin word "fluidus", meaning flowing or liquid. Therefore, the combination of "brake" and "fluid" essentially refers to a liquid substance used to control or stop the motion of a mechanical brake system.