Vehicle Brakes During 1-2 Upshift
WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: incorrect fluid level, or damaged reverse clutch, low and reverse brake, high clutch or low one-way clutch.