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The fault could be lack of hydraulic fluid, low brake fluid in the reservoir, a broken hydraulic line or a bad master brake cylinder. The sensor is used to detect pressure differentials in the hydraulic system. If the car alerts a fault in the hydraulic system and the system checks out, the sensor itself may have failed. [2]
The most common vehicle uses of master cylinders are in brake and clutch systems.. In brake systems, the operated devices are cylinders inside brake calipers and/or drum brakes; these cylinders may be called wheel cylinders or slave cylinders, and they push the brake pads towards a surface that rotates with the wheel (this surface is typically either a drum or a disc, a.k.a. a rotor) until the ...
The spinning disc brake will be adjacent to the piston with the larger cross-section. Suppose the diameter of the master cylinder is half the diameter of the slave cylinder, so the master cylinder has a cross-section four times smaller. Now, if the piston in the master cylinder is pushed down 40 mm, the slave piston will move 10 mm.
A power braking system consists of several distinct components, including the vacuum booster, master cylinder, brake fluid reservoir and lines, and calipers (or drums). Power brakes have been around in some form since the 1920s, and since the late 20th century all cars sold in North America have been equipped with power brakes.
The process is performed by forcing clean, bubble-free brake fluid through the entire system, usually from the master cylinder(s) to the calipers of disc brakes (or the wheel cylinders of drum brakes), but in certain cases in the opposite direction. A brake bleed screw is normally mounted at the highest point on each cylinder or caliper.
When the brake pedal of a modern vehicle with hydraulic brakes is pushed against the master cylinder, ultimately a piston pushes the brake pad against the brake disc which slows the wheel down. On the brake drum it is similar as the cylinder pushes the brake shoes against the drum which also slows the wheel down.
The recall concerns brake fluid leakage from the master cylinder (U.S. market and non-U.S. marketed Toyota Crown and Lexus GS350) and an electrical problem with the fuel pump, which would cause engine stalling (all markets except the U.S.).
GB 377478 Hall Frederick Harold Improvements in wheel cylinders for hydraulic brakes 1932-07-28; US 1954534 Norton Raymond J. Brake 1934-04-10; US 1959049 Buus Niels Peter Valdemar Friction Brake 1934-05-15; US 2028488 Avery William Leicester Brake 1936-02-21; US 2084216 Poage Robert A. and Poage Marlin Z. V-type brake for motor vehicles 1937-06-15