Electrically controllable pneumatic brake system for a vehicle, in particular a utility vehicle, comprising: a front-axle brake circuit for a front axle of the vehicle having a first compressed-air supply and front-axle brake actuators (8a, 8b), a rear-axle brake circuit for at least one rear axle (HA, HA2) of the vehicle having a second compressed-air supply and rear-axle brake actuators (10a, 10b, 10c, 10d), and a manually operable brake value transmitter, which is connected to the first and second compressed-air supply (3, 5) and, upon actuation, adjusts a first front-axle brake control pressure (pVBS1) and a first rear-axle brake control pressure (pHBS1), the front axle brake circuit comprising a front-axle relay valve, which is connected to the first compressed-air supply and is designed to adjust a front-axle brake pressure (pBVA) at the front-axle brake actuators (8a, 8b) when a front-axle brake demand pressure (pVAS) is received, and the rear-axle brake circuit comprising a rear-axle relay valve, which is connected to the second compressed-air supply and is designed to adjust a rear-axle brake pressure (pBHA) at the rear-axle brake actuators (10a, 10b, 10c, 10d) when a rear-axle brake demand pressure (pHAS) is received, characterized by a dual-channel pressure modulator system, which is connected between the brake value transmitter and the front- and rear-axle relay valve (20, 22), the dual-channel pressure modulator system being designed to receive an electronic brake demand signal from a unit for autonomous driving and, in response thereto, to adjust the front-axle brake demand pressure (pVAS) and the rear-axle brake demand pressure (pHAS), and which is also designed to receive the first front-axle brake control pressure (pVBS1) and the first rear-axle brake control pressure (pHBS1) and, at least in the event of a fault in an electronic component (ECU1, ECU2) of the pressure modulator system, to adjust the front-axle brake demand pressure (pVAS) on the basis of the first front-axle brake control pressure (pVBS1) and/or the rear-axle brake demand pressure (pVAS) on the basis of the first rear-axle brake control pressure (pHBS1). a front-axle brake circuit for a front axle of the vehicle having a first compressed-air supply and front-axle brake actuators (8a, 8b), a rear-axle brake circuit for at least one rear axle (HA, HA2) of the vehicle having a second compressed-air supply and rear-axle brake actuators (10a, 10b, 10c, 10d), and a manually operable brake value transmitter, which is connected to the first and second compressed-air supply (3, 5) and, upon actuation, adjusts a first front-axle brake control pressure (pVBS1) and a first rear-axle brake control pressure (pHBS1), the front axle brake circuit comprising a front-axle relay valve, which is connected to the first compressed-air supply and is designed to adjust a front-axle brake pressure (pBVA) at the front-axle brake actuators (8a, 8b) when a front-axle brake demand pressure (pVAS) is received, and the rear-axle brake circuit comprising a rear-axle relay valve, which is connected to the second compressed-air supply and is designed to adjust a rear-axle brake pressure (pBHA) at the rear-axle brake actuators (10a, 10b, 10c, 10d) when a rear-axle brake demand pressure (pHAS) is received, characterized by a dual-channel pressure modulator system, which is connected between the brake value transmitter and the front- and rear-axle relay valve (20, 22), the dual-channel pressure modulator system being designed to receive an electronic brake demand signal from a unit for autonomous driving and, in response thereto, to adjust the front-axle brake demand pressure (pVAS) and the rear-axle brake demand pressure (pHAS), and which is also designed to receive the first front-axle brake control pressure (pVBS1) and the first rear-axle brake control pressure (pHBS1) and, at least in the event of a fault in an electronic component (ECU1, ECU2) of the pressure modulator system, to adjust the front-axle brake demand pressure (pVAS) on the basis of the first front-axle brake control pressure (pVBS1) and/or the rear-axle brake demand pressure (pVAS) on the basis of the first rear-axle brake control pressure (pHBS1).