Yes and no. They will not do that with their built in flasher. You can do it with an external flasher though. Im really only fluent in Whelen products, so your cheapest option with Whelen would be a ULF44. Set the Vertex to steady first. Then hook them up to the ULF outputs. Then hook the wire that used to go to the Vertex to the 12v input wire on the ULF. Then add a second wire from your brake to the pattern override input on the ULF. Set your primary pattern to whatever you want, then set the override to steady, or brake alert, or whatever brake pattern that you want.