If you can't get into reverse it is because you are not getting full release from the clutch. The reverse gear has no syncros so you can't shift into it if the transmission is still turning because the clutch has not fully released or the rear wheels are spinning. Either you still have air in the clutch hydraulics or you need more throw (movement) of the slave cylinder. Or your clutch is so worn that you can't adjust anymore. Try shifting into reverse with the E brake on so the wheels are not spinning. It can be hard to get all of the air out so it may still need more bleeding. To prevent things from leaking you should be flushing and refilling the brakes AND clutch at least every other year with Castrol DOT 4.