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why disk breaks are apply only in front wheels?

In cars and bikes only front wheel has disks breaks and rear wheel has drum breaks . when rear breaks are more imptant than front breaks. why not all (reae and front) wheel has disk breaks?
B S Dandiwal, April 2007
Most of the braking (stopping power) is obtained from the front wheels, not the back...especially for bicycles.

Ross, June 2007
disc brakes are a more expensive form of brakes and so are used on the back as it is the front brakes that need to have the highest braking force. This is because as a car brakes most the weight of the car acts on the front wheels of the car.

dav, May 2007