brake failure indicator project wikipedia
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Document on automatic brake failure indicator and braking system
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The circuit will only work on vehicles with negative ground. It also gives an indication of brake switch failure. In vehicle hydraulic brake systems, a brake switch is mounted on the brake cylinder to operate the rear brake lights. The brake switch operates with fluid and will not operate if fluid pressure drops due to leakage. Fluid leakage can not be detected easily unless there is a strong pressure drop on the brake pedal. This circuit detects the possibility of a brake failure when controlling the brake switch and reminds you of the brake status each time the brake is applied.

Brake failure indicator circuit

The circuit uses an op-amp IC CA3140 (IC2) as voltage comparator and timer NE555 (IC3) in monostable alarm configuration. Voltage comparator IC2 detects the voltage level at the brake switch. Its non-inverting input (pin 3) receives half of the supply voltage through the possible R3 and R4 resistors of 10 kilohms each. The reversing input (pin 2) of IC2 is connected to the brake switch via diode D1, IC 7812 (IC1) and resistor R2. It receives a higher voltage when the brake is applied.

[Image: 1A7_june1-_-vefy.png]

Normally, when the brake is not applied, the IC2 output remains high and the red LED (LED1) lights up. The output of IC2 is fed to the trigger 2 of the monostable via the coupling capacitor C2. The resistance R1 is used for the IC2 input stability. IC1 and C1 provide a ripple-free regulated supply to the inverting input of IC2.

IC3 is wired as a monostable to give pulse output one second. The timing elements R7 and C4 cause the output to be high for one second to activate the buzzer and LED2. Usually, the IC3 trigger pin is high due to R6 and the buzzer and LED2 remain 'off'.

When the brake pedal is depressed, IC2 pin 2 receives a higher voltage from the brake switch and its output lowers to turn off the red LED. The low output of IC2 provides a brief negative pulse to the monostable via C2 to activate it. This activates the buzzer and LED2 to indicate that the brake system is working. When there is a pressure drop in the brake system due to leaks, the LED1 stays on and the buzzer does not sound when the brake is applied.
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