Originally Posted By: Gokhan
Originally Posted By: Ducked
Might help to lubricate behind the dust boot with brake fluid and/or vegetable oil, to help it on its way out.
Don't use anything other than brake fluid or glycol grease supplied in the kit because it could contaminate the system.
Well, you're dismantling this to (presumably) give it a good clean. In that context, its rather hard to see how stuff applied behind the dust boot is going to contaminate "the system".
I thought of Canola oil because its probably a better lubricant than brake fluid and specialist brake greases (which wouldn't be sufficiently penetrative anyway) are unobtainable here. Didn't try it last time but will next.
If it bothers you, though, stick to brake fluid.
My manual says to remove the snap ring and dust boot first, but forgets to mention that this might be impossible, which it was. It was, however, possible after removal of the piston, which (on the Daihatsu) is possible without removing the dust boot or snap ring. YM (on a different car) MV.
If you've got a seal kit this won't matter much since you'll be replacing, but I didn't have one.