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So have you checked for any signs of fluid leaking at the caliper and the brake lever?
Take the pads out and inspect the backing plate, then chuck a bleed block in, pump the brakes and check the sides of the pistons for fluid bubbling. Roll back the hoods of the levers and see if there's any bubbles around the edges as well.
pascalo
Aside from a leak, is there any other reason why there would be less fluid than there should be as well as some air in my hydraulic system?
I went to ride my bike after it had sat for 2 weeks a couple of days ago. The rear lever immediately had a noticeable difference in feel; it was doing that thing where it gets progressively stiffer as you squeeze it in quick succession. Yesterday, I had a look in the lever reservoir and there was definitely less fluid than there should have been. So I attached the funnel and ‘burped’ the system to top it up and get the air out. The lever felt fine then (I think). But for some peace of mind, I took it into a shop today to have it looked at, however they reckon that if there was a leak then you’d already be able to feel a difference in the lever and the burping wouldn’t have helped. They’re going to keep it overnight to see anyway.
I’m still learning hydraulic brake stuff so just don’t know what the reason for the air and lack of fluid could be if it’s not a leak?