By scraper are you talking about a piece of agricultural equipment or a piece of construction equipment. Reason I ask is that a typical, older ag tractor's hydraulic system rarely runs over 1000-1500 PSI at most, while the hydraulics on most older construction equipment typically runs higher at around 2000 to 2500 PSI or more.
That said the pressure rating of any type of steel tubing is going to determined by the tube diameter (ie 1/4, 3/8, etc) as well as the wall thickness (ie .093, .187, etc are two sizes I seem to recall being used for the hydraulic tubing I've used in the past). Where ever you plan on getting the tube should be able to get you the specs on the tube your looking at. From there you'll just have to look at the operating pressure of the system vs the rated operating pressure (not burst pressure)of the tube and choose from there.
Finally unless you have something odd most older hydraulic lines like you are describing have what is known as a 37 degree JIC end on them. Unfortunately brake lines aren't flared at a 37 degree angle so you'd need the flaring tool specifically designed for hydraulic tube that has the proper angle on it. I have seen people get away with using the wrong angle flareing tool, especially on the smaller line sizes and thinner wall tube because as it is pulled tight against the male half of the fitting it can make the wrong angle at least somewhat right...but there are no guarantees. Too if it doesn't make the angle 'right' the stresses on the joint aren't spread out properly and could cause the tube to split in the taper causing a failure. The best thing is to get the right tool for the job and then you know it's done rigtht and there will be no leaks. Good luck.
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