Abstract: A vehicular brake failure detecting device for providing two warning signals independently of each other when brake linings need repair or replacement. With the ignition switch on, a first electrical circuit is closed to provide one alarm; and with the brake pedal depressed, a second alarm is given. The two circuits are closed for the first time when the brake pedal is depressed and a conductive pin, embedded in the brake linings, is exposed to contact a disc rotor or brake drum. Thereafter, the first circuit is closed as long as the ignition switch is on while the second circuit is activated only when the brake pedal is depressed.