Bow pressure doesn't mean tensing up the muscles in the bow arm, but by relaxing the natural weight of the arm into the string. The more pressure you use, the faster you must move your bow to avoid scratching. The less pressure you use, the slower you can move your bow and still make a good sound.
How much tension should be on a violin bow?
So how much tension is enough and how much is too much? A good rule of thumb that I use is a pencil width. If you tighten your bow a bit and can just fit a pencil in between the bow hair and the stick in the middle of the bow, that is enough tension.
Is my violin bow too heavy?
The average weight of a violin bow is about 60 grams (a viola bow is 70 grams; a cello bow, 80 grams). ... On the other hand, a 66- or 68-gram violin bow would be too heavy for almost anyone. Proper balance is far more important than weight. I know players who won't even look at a bow if it doesn't weigh 60 grams.