Brake Spacers

now after making a censored of my brakes I have some more and on reading what it says in MBUK's grimetime of "bleeding Shimano and Hope disc brakes" it says:
"Using a hard plastic tyre lever or something similar - so that you don't damage the surface of the pistons - push the brake pistons back into the calliper body. Insert a spacer to stop the pistons moving during the bleeding procedure"
I know it may sound stupid but what is a spacer? and where can I get one from?
"Using a hard plastic tyre lever or something similar - so that you don't damage the surface of the pistons - push the brake pistons back into the calliper body. Insert a spacer to stop the pistons moving during the bleeding procedure"
I know it may sound stupid but what is a spacer? and where can I get one from?
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yes but why?
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown