https://www.brake-cylinder.com/news/the-role-of-brake-fluid-level-sensor-63143945.html

The Role Of Brake Fluid Level Sensor

Nov 28, 2022

Many master cylinder, especially systems that are a diagonal split, usually use a brake fluid level sensor or Switch in the master cylinder reservoir.

this sensor will light the red brake warning lamp on the dash if low brake fluid level is detected. A float-type sensor or a magnetic reed switch are commonly used and provide a complete electrical circuit when the brake fluid level is low

After refilling the master cylinder reservoir to the correct level, the red "brake" warning lamp should go out

What is oil float ?

It is magnetic and acts as a cue if the brake fluid gets too low, the float reaches the bottom of its travel and closes a set of switch contacts allowing the ABS or brake warning light to come on.

How to Diagnose and Fix a Brake Fluid Leak

By: HowStuffWorks | Aug 26, 2023

https://auto.howstuffworks.com/under-the-hood/diagnosing-car-problems/mechanical/brake-fluid-leak.htm

https://www.hotrod.com/how-to/disc-brake-pad-friction-codes-explained/

Disc Brake Pad Friction Codes Explained

Understanding Brake Pad Codes

· All U.S. street-legal and many racing pads have a two-letter friction designator stamped on the pad edge or the backing plate.

· The first letter designates low-temperature friction performance (200 to 400 degrees F).

· The second letter designates high-temperature performance (300 to 650 degrees F).

· The higher the letter in the alphabet, the better the friction performance.

· Normal pad code letters range from C through H.

· If the first letter is lower than the second letter, the pad works better at high temperatures and needs a warm-up.

· If the second letter is lower than the first letter, the pad may fade at high temperature.

· The best all-round street pads have good friction at both high and low temperatures (as in code "FF").

SAE J866 Friction Designators
FRICTION COEFFICIENT	CODE
Up to 0.15	C
Over 0.15 up to 0.25	D
Over 0.25 up to 0.35	E
Over 0.35 up to 0.45	F
Over 0.45 up to 0.55	G
Over 0.55	H
Unclassified	Z