Brandon Jenner: I Don't Believe in Car Jinx

Brandon Jenner is clearly not superstitious .... because he got his dad's hand-me-down SUV -- the one that triggered a fatal car crash.

We're told Caitlyn gave her son the Escalade after it underwent some serious body work.

Brandon needed a safe ride because he's now carting around a wife and new baby. The SUV is certainly road tested. It smashed into 2 cars on PCH in February ... a Lexus and a Prius, yet the damage wasn't enough to total it.

It passed the crash test for sure ... still a little weird.