They're due to walk off the job in three 48-hour stoppages this month – on the 8th and 9th, 15th and 16th, and the 23rd and 24th.
The unions representing staff say it's only fair that bus drivers and Luas drivers are paid the same wage.
NBRU General Secretary Dermot O'Leary is remaining cautious ahead of today's meeting with Dublin Bus management.
