Devices for controlling carbon disc brakes, more particularly for aircraft

A device for controlling the braking pressure of a carbon disc brake as for example in undercarriages of aircraft carrying a heavy load comprising at least one tachometric dynamo for determining the rotational speed of a disc of a brake, an inverted time-delay means acting to increase the pressure in the disc brake, means for applying the output of said dynamo to said delay means, a brake control means including a potentiometer with its output signal applied to the input of an operational amplifier followed by a second similar amplifier, said two amplifiers having a common negative feedback connection so as to operate as follower amplifiers for controlling braking pressure via a solenoid valve, the direct connection between the output of said first amplifier and said second amplifier comprising a diode which opposes the direct flow of current and a capacitor in parallel beyond said diode towards said second amplifier, and means controlled by voltage of said tachometric dynamo so as to modify the charging state of said capacitor if there is a variation in the input voltage of said first amplifier.