I have honed a lot of cylinders that were pitted pretty badly and had good success. I have an old Ammco hone that puts pressure on the stones. I used to buy honing oil, but I now use a mixture of vegetable oil and bioDiesel for honing oil. They have to be honed deep enough to remove every trace of pitting. The rubber cups are pretty forgiving about oversize, but any small imperfection will cause a leak. That includes honing without honing oil which leaves metal filings in the bore. Some cylinders are easier to replace than to hone. However the cylinders on some larger trucks are almost impossible to find and honing or sleeving is the only option. The hydrovacs put a lot of pressure on the wheel cylinders, but I have never had a sudden failure.
