Legality of running a capacitor inline with roboRIO power

[Ether]

The OP has not specified under what conditions the motors brown out when up on blocks.

I did not see any mention of how many motors are in his drivetrain or what drivetrain motor controllers are being used.

With e.g. 6 motors being commanded by controllers without voltage ramping, and given the high-motor-speed 4.75ft/s gearing, is it not possible to have up-on-blocks motor brownouts for step throttle changes from full forward to full reverse... even if all the wiring is correct?