A bizarre Brooklyn carjacking that ended with a stolen SUV crashing through a fence and teetering on a retaining wall above a highway was part of a massive illegal marijuana attempted robbery involving more than 600 pounds of weed, police said Tuesday.

Three people — two of the three carjackers, as well as their victim — were arrested for their part in a half-baked plan to steal the SUV, which had more than 150 pounds of marijuana hidden inside, cops said.

Victim Ting Liu, 37, was driving the pot-packed 2014 Toyota Sienna through Dyker Heights when three men approached his SUV as he was stopped near the corner of Bay Ridge Parkway and 11th Ave. around 12:30 a.m. Saturday, cops said.

The suspects punched Liu in the face, knocking him to the ground. Then they repeatedly kicked him whi

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