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don't know what you are using but automatic trans fluid will loosen up those pistons try to cover the tops of the pistons and just let it sit be paitent maybe 4 0r 5 days but it will work .however if you are in a hurry try to get hold of a can of (krol) this is the best penetrating fluid you will ever use it is made by kano labatories and used in the aero space industry it will loosen any thing hope this helps