Brake fade-Since during braking of a vehicle a large amount of heat is generated and the brakes drums and discs are forced to absorb this.Hence brake fade describes a condition where heat is generated at a faster rate than they are capable of dissipating into the surrounding.
Since the brake pad is fixed with some adhesive material hence when such large temperatures are achieved during braking this adhesive material starts to vapourise and forms a layer between the disc rotor and brake pad there by decreasing the braking force(as the layer formed is compressible)which in turn reduces the braking efficiency of the vehicle.Also the friction material overheats and the coefficient of friction drops off significantly which also reduces the braking ability of brakes.
Brake drag-It is the rolling drag that brakes incur at elevated temperatures.This problem can be caused by several occurrences from failing of master cylinder to misalignment of brake calipers.Generally brake drag is caused due to incomplete brake shoe release.
Or by broken or weak springs on drum brakes.Or may be due to corroded or jammed caliper piston.Also brake drums that have defective linig material,out of round(elliptical),have clogged lines or hoses or loose anchor pins can also cause brakes to drag.
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