Waitakere's first half went from bad to worse when All White Jake Butler was given his marching orders for a crude tackle on John Irving just before the break.
Tade made it 4-0 three minutes after the restart, firing a rasping low strike into the bottom right hand corner.
The visitors made a raft of changes from the side that lost 4-0 last weekend, with imports Jordon Lowdon and top scorer Richard Cardozo consigned to the bench, while former All White Chad Coombes was left out of the squad entirely.
Cardozo came off the bench in the second half to pull back a consolation goal with a classy finish before Robinson held out a flurry of late Auckland attacks.
The pacey Auckland attacking trio of Tade, Ryan De Vries and new Portugese signing Joao Moreira caused Waitakere all sorts of problems, while defenders Ivan Vicelich and Angel Berlanga were rarely troubled by a blunt Waitakere front line.
Auckland will meet Wellington in the final at 2.35pm next Sunday at Kiwitea Street.
