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Cap on or cap off?

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Hi all, I am going to be replacing a rear caliper on my ep3 soon and wanted to know if the brake reservoir cap should be on or off whilst bleeding the caliper or does it make no difference? Also, ignition on or off whilst bleeding?
 
Hi all, I am going to be replacing a rear caliper on my ep3 soon and wanted to know if the brake reservoir cap should be on or off whilst bleeding the caliper or does it make no difference? Also, ignition on or off whilst bleeding?

YES you need it off while adding more been fluid and pumping the breaks
 
And you don't need the ignition on either. Keep an eye on the fluid and keep topping up while bleeding. You don't want it to go empty and drag air into the braking system
 
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