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Sounds like it, if it's shimano whack the bleed cup on and pump it a bit and any bubbles will likely burp out.
snottyotter-
@andyp Mini-bleeds can be carried on SRAM levers too if you have a bottle of fluid with a nozzle, I find the Fenwicks 80ml work well. DOT isn't very nice stuff though so you have to be a bit more careful than with Shimano.
https://www.pinkbike.com/news/tech-spotlight-5-minute-bubble-bleed-2014.html
leggy_blonde
The rear brake on my cross bike is playing up a bit, it loses pressure frequently, but is rectified by a few pumps of the lever. It's then fine until it's left for a bit, then you have to repeat.
Am I right in thinking there is probably some air in the system that is the root cause?