I've been playing Bruch and Saint Saens Intro and Rondo Capr. for awhile, but my tehcnique is still quite weak.
What pieces or etudes or caprices or scales etc. do you recommend to build up technique for future more advacned reportoire?
Sam, at any rate you should get the following three books: 1) "Basics" by Simon Fischer; 2) "Scale System" by Carl Flesch; 3) "42 Etudes or Caprices" by Kreutzer. You will have a lot of fun with these, regardless what else. On the other hand, if you want to become really advanced on the violin, you should take lessons from a high-level teacher.
I'd ask why you're working on such advanced repertoire if your technique is "quite weak." Maybe you should choose repertoire targets that within your present horizon.
By the time you are playing that repertoire, you should have solid, mature technique. From that point forward, you might pick up some virtuosic tricks, but at that point you are mostly taught refinement and musicianship, not fundamental technique.
I think at this stage you may still be refining certain technical skills a bit, but your technique should be quite solid at this point. I personally play at a similar level and my teacher is still working to correct some minr basic issues, but generally, I'm quite solid technically. I'm asking the same question: which aspect(s) of technique are weak?
If you can get through these pieces, I'm also curious what exactly is wrong with your technique? Or did you mean your technique with these pieces in particular?