Q about positioning gears and brakes on drivceshaft

Hi,

I am building a driveable Tiger tank 1:4 model for my kid, and I am wondering does it matter where I position the speed reduction gear or brake disc on the driveshaft, i.e. is there any difference if I place the speed reduction gear very close to the motor, or on the far end of the driveshaft? Driveshaft is straight with no angle. Same with brake disc. Would the distance at which the brake disc is placed from the motor affect anything related to braking, and is there optimal distance, or it's insignificant in this application? Driveshaft is max 40cm on each end.

https://ibb.co/vhk7KsM

Any advice would be appreciated..