77The left and right brake pedals are connected mechanically to the Brake Transmitter transducer on the FO rudder pedal mechanism.

Brake Transmitter Tranducer, connected to the brake pedals by rods; Image by David Cheilan

XMTR UNIT BRK PEDAL (P/N C20 215000)

Pinouts

Right Brake G/M(wiper)/U  or H/P(wiper)/Y
Left Brake  Y/C(wiper)/H or K/B(wiper)/V

Reference ASM 32-42-01