Where can I find the serial number of my SRAM brake? The serial number of all our HRD road brake models is located on the bottom of your brake caliper between the threaded holes for mounting. Reference our serial number location guide for detailed information. Related articles Where can I find the serial number of my SRAM brake? How do I shorten my SRAM Road brake hose? Do SRAM road brakes come with a bleed kit? Why are my SRAM road disc brakes noisy? What type of brake pads are required for SRAM eTap AXS HRD road disc brakes?