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Pads on front. Drums on the rear.
You can find a picture or diagram of the 1991 Nissan rear brake drums at most Nissan dealerships. The picture or diagram can also be found in most Nissan service manuals.
They are behind the rear wheels.
front brake assembly diagram for a 2006 F150 4X4
You will find that the front brake rotors are located behind the front of your wheel spindle, (behind your wheel and brakes). There you will see the rotors.
It is important to know where to get replacement car parts. For a 1965 International D1100 the brake lights usually have to be ordered from a local auto part store.
Chiltons manual at the library.
Pick up a hemmings paper and you might find some for sale or a place where you could purchase them from the aftermarket.
Examine the brake cable from the cab all the way back to the rear wheels. If the cable isn't broken, pull the wheels and drums and check for wear on the brake shoes. It might just be an indication that you need to replace the rear brakes. Once the drums are off, have someone operate the hand brake while you watch the cables. If the cables aren't pulling, find out where the cable is broken.
Jack up truck,place on jackstands,remove front wheel, take off centre grease cap,behind this you will find large nut with split pin,remove split pin, remove large nut,remove large steel washer,brake drum should now pull off complete with outer wheel bearing, If drum is stubborn back off brake shoes a bit they could be holding drum.
Front Brake Rotors can be a pain, I would recommend going to your local Pepboys, Kragen, O' Reilly's or AutoZone Near you. They will need your year and model of vehicle.
It sounds like your brakes are grabbing, which is often caused by oil, grease or brake fluid on the brake shoes or drums. Take the brake drum off and if you find any contamination on the lining or the drum use brake cleaner to remove it.