it actually isn’t normal for them to stall when the brakes are pressed, i have never seen this happen in any of mine or my friend’s 240s (SOHC and DOHC), you’ve got something wrong with your car.
and i can almost guarantee you it isn’t an electrical problem causing his car to stall unless he has a bad alternator and the battery is dead, my money is on the brake booster leaking air into the intake, MAF doesn’t see this air and doesn’t add the fuel to compensate for it.