My first car had drum brakes allround! (B reg Mini!)
I'd start by taking the front pads out, make sure the slides arent sticking, make sure the pistons move in and out smoothly.
Assuming thats all ok and the pads arent worn clean the corrosion/dirt off the stainless steel pad thingies and the pad carrier. Clean loose rust off the edge of the disc too.
Re assemble with a light smear of brake grease (BMW stuff is best, 34p trade price a sachet, which does 2 cars but copper slip will do)
Dont put too much on or it causes dirt to get trapped, a light film is more than enough. Remember to pump the pedal back up!
Moving to the rear, slacken off the handbrake cable at the lever. Take the drums off. Check the wheel cylinder moves and isnt leaking. Check the handbrake lever on the brake shoes moves and returns to the stop and remove any rusty lip from the drum.
Sand glazing off the rear shoes and chamfer the edges of the friction material at 45 degrees, this gives the brakes more bite.
Assuming it isnt siezed, turn the adjuster wheel a few clicks and try the drum back on. You want the drum to turn easily with a slight rub from the shoes. If its not right, give the adjuster a few more clicks. When there is a slight rub work the handbrake on and off a few times to realign the shoes and try again.
When you have both drums spinning with very light resistance adjust up the cable at the lever again. Nissan recommend 7 clicks. Pull it on and make sure the drums are locked. Release it and make sure they both spin. Retry with an assistant pressing the footbrake.
Dont over adjust the rear brakes, Micras dont like this! Too tight and it will boil the brake fluid and the brakes will fade quickly. Will cost you more in petrol too!(Y)
