I went for the expensive one because I thought it would be useful to be able to apply small amounts of pressure to something or other at some stage. But have not found a use for it yet. I don't think it would pop a Piston out of a Caliper like an airline does. Nasher
That is of course very true, if you are not looking for an excuse to spend money on tools. And it is much easier to do it with a pump.
