Use one brake to control both front and rear brake calipers. Tempra has created a system in which you can use either your left or right brake lever to control both of your brakes. This system can be used with pretty much any brake lever/ caliper combination. The system is pretty straight forward to install, but is is recommended you have an experienced bike mechanic install the doubler if you are unsure. Please check the photos for reference, and feel free to e-mail us if you have any questions regarding this part. Available in either Black or Silver.