What does the caliper look like, is it a sliding pin caliper?
Dunno. Like this!
1 Attachment
It is a sliding caliper. I would bet that issue is the sliders. Calipers were replaced bet the issue was the sliding pins and wrong lubricant used.
If it's a single piston caliper it could well be the slider pins that are sticking, not the piston. Quite common due to corrosion on the sliders. Second opinion sounds like a good idea.
@Stevethecoffee started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
What does the caliper look like, is it a sliding pin caliper?