Toyota front pad, rear drum braking systems are probably one of the easiest designs (oops used the easy word :) ) to replace.
Having said that, rear drums on the Corolla should last 70,000-100,000 miles and front pads about 60,000 miles.
This is because the Corolla is a very light car and the brakes are an excellent design. Always check the rotors/drums for excessive wear.
I replaced the rear shoes on my 1991 Corolla at 150K and they were still in good shape.
Wednesday, September 2nd, 2009 AT 6:05 AM