Yup as a fleet mechanic I find myself having to make alot of brake lines, finally got one of those master cool hydro tools, I like it, look around prices vary widely, look at some of the online tool sellers, eBay and Amazon, don't be in a hurry to get the 1st one you see, you'll save some cash. I've found some specialty tools on eBay and CL that were used like once and the seller either got out of the business or died and you get lucky and get it cheap.

I've used the old hand double flare tools for years,
Sometimes those fit into a tight space a bit easier than the Master cool one.