Shimano Dura Ace BR 7900 Brakes Front or Rear. When it comes to braking performance, you'd be hard pressed to find a pair of brakes with better modulation and braking control than Shimano Dura Ace 7900 brakes. In fact, they've become something of an industry standard, and all other brakes are compared against them. With an enhanced brake arch and spring tension adapter, they offer improved modulation and power, especially paired with long pull Super SLR levers. The stock brake pads provide double the braking power in wet conditions, and set the bar for excellence in dry conditions.