Diagram reference number 3 in the image below:
" Fitment: 1991 TOYOTA PREVIA LE - 3 door

Application Notes:

Category: Brake

SubCategory: Brake Hardware

Position: Rear Left

Part Number: 4775028180


This is a Disc Brake Caliper that fits the 1991 TOYOTA PREVIA LE - 3 door with the 2TZFE engine. The Disc Brake Caliper is designed by TOYOTA to be part of the Brake-Brake Hardware. The Disc Brake Caliper has a position on the vehicle of Rear Left. The 1991 TOYOTA PREVIA Disc Brake Caliper is a factory made TOYOTA OEM part and it comes with a 12 month 12,000 mile warranty (parts only). Do not be fooled by an aftermarket TOYOTA PREVIA Disc Brake Caliper! Buy a factory TOYOTA part and receive peace of mind!
This factory part has a part number of 4775028180.