Astra van cdti 1.7 cdti brake cylinder?

Hi, I was changing my brake shoes on my vauxhall astra van cdti 1.7 and as I was removing the hub, one of the pistons from the brake cylinder came away, I managed to push it back in including the spring and went for a drive, I came back and removed the wheel just to inspect it to make sure it wasn t leaking at all,... show more Hi, I was changing my brake shoes on my vauxhall astra van cdti 1.7 and as I was removing the hub, one of the pistons from the brake cylinder came away, I managed to push it back in including the spring and went for a drive, I came back and removed the wheel just to inspect it to make sure it wasn t leaking at all, all seemed fine and I ve checked the fluid to make sure it hasn t gone down! What I m just thinking about is, does the pistons come out easy enough and go back in or is it wanting a new cylinder? Cheers
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