Gillingham cruised into the second round of the FA Cup.
Mark Bentley gave the Gills the lead when he nodded home after a deflection left keeper Andy Walker stranded.
Bentley doubled the lead when he pounced on a loose ball to hammer past Walker, but Nic McDonnell pulled one back for Bromley with a neat finish.
Guylain Ndumbu-Nsungu smashed home from close range to restore Gillingham's two-goal lead and then curled in a fourth in the last minute.
Gillingham: Jack, Jupp, Cox, Johnson (Sancho 27), Easton, Bentley, Flynn, Pouton (Crofts 60), Jarvis, Mulligan, McDonald (Ndumbu-Nsungu 71).
Subs Not Used: Jackman, Savage.
Goals: Bentley 31, 59, Ndumbu-Nsungu 84, 90.
Bromley: Walker, Duku, Henriques, O'Sullivan, Adeniyi, Bowry (Greenway 90), Moore (Williams 61), Watts (Osborn 51), Wood, McDonnell, Blackman.
Subs Not Used: Shimell, Simpson.
Goals: McDonnell 70.
Ref: K Hill (Hertfordshire).