The subject innovation relates to a lack of warning devices car brake oil pressure generated, and more specifically to a switch on the cylinder inner failure to form a brake fluid pressure piston to hit the cylinder wall prevent the cylinder is broken due to leakage or high temperature generated in the brake fluid It is intended to protect the piston and the master cylinder to install.; The lower pipeline of the brake fluid supplied to the supply store (40) tank 100 and the supply tank 100 and the return port 110 and suction port 120 installed at the bottom, the supply tank 100 50 in a typical automobile brake devices on the inner lower master cylinder 30 provided in the return spring 10, the piston 20 is entered into the installation,; Fastening the piston 20, a master cylinder 30, a screw 80 is threaded is formed disposed the hole 90 and mounting the switch 60 to the end of the inner hole 90, the inner wall end that is operated by receiving the power and a car brake hydraulic pressure generated insufficient warning device connected to the warning light (70) instrument a screw 80 provided on the panel.
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