Attributes of Design
1. SELF-ALIGNMENT
2. UNIFORM FORCES ON BRAKE SHOES
3. BOTH BRAKE SHOES ENGAGE AT THE SAME TIME
4. SELF-ADJUSTMENT
5. SIMPLICITY OF CONSTRUCTION
6. RELIABILITY
7. ANTI-LOCK FEATURE FOR SAFETY
8. BRAKING CHARACTERISTICS CAN BE EASILY CHANGED TO SUIT RIDERS NEEDS
9. TWELVE DEGREES OF MECHANICAL FREEDOM