If this was a
A345/6, at the gate, the alternate braking is controlled by the EBCU which regulates the pressure to 1000psi, which is normal to see.
Alternate braking is active when GRN pressure is insufficient provided that BLU pressure is available, A/SKID & N/W STRG switch is on and parking brake is not on. Auto switching from GRN to BLU systems is provided. BLU pressure indication to both left and right brake and accumulator pressure is provided. Autobrake is inop, A/SKID is operative. Alternate braking without A/SKID should not exceed 1000 PSI on the triple indicator. A346 pressure is auto-limited to 1000psi. A Nov 2000 telex from AI seeks to highlight the different "feel" of the braking system with the BRAKES ANTI-SKID FAULT ECAM message: basically with this message there is no anti-skid available and braking is only through the alternate braking system. When braking is applied on the alternate braking system the brake response is higher than on the normal braking system. This is particularly marked for small brake pedal deflections. Pure accumulator operation provides seven full brake applications. The parking brake is supplied by BLU pressure and is only on when it's ON! The BLU electrical pump may be used. Activation of the Parking Brake deactivates ALL other braking modes.
A343 is different.