- Keene, NH
As others have said it SOUNDS like air in the lines, but if a simple bleed -- and I'm sure you looked up "tektro brake bleed" on Twitter -- isn't getting the job done, it's possible the calipers are screwed up. One of my zoom calipers is total junk -- the one that came with the bike -- because the bladder that pushes out the piston on one side is broken and leaks. Something I figured out once I had it on my workbench. It is also possible that something as simple as the hoses not being screwed in all the way or clamped down properly is at fault, or even a torn hose.Hello, I realize this is an old post but I am having a similar problem and none of the typical solutions or videos have helped.
I would inspect EVERYTHING carefully.
That's entirely typical of my experiences with local bike shops, and why whenever some clown says "Just take it to the LBS" my knife-hand whips up like a DI ready to back-hand some civvie piece of slime. Instantly triggers my inner "I didn't know they stacked S*** that high" reaction.Since then I cannot trust the shop to handle repairs after my last experience with them where it sat for 2 months, then I was charged for repairs that were not made and my bike came back worse than when I sent it in. The brakes pressure was very low (50%) and the front tire was nearly bald. ie. they were joy riding my bike for 2 months. So the solution of bring it back to the shop is not an option.
Never heard of that one. I dislike using the cup and use the syringe instead, because negative pressure can often extract bubbles (assuming things are sealed) and help compress the bladders making it easier to move the pistons in. Likewise you can hold a negative pressure to disconnect the bottom line with minimal dripping, then force new fluid through capturing the old stuff.4. I ran an electric toothbrush over the lines to relieve bubbles. I never see any in the oil cup.
IF there's fluid in the system, and compressing the handles does not move the pistons, I would assume the calipers are trashed. It seems rare for the problem to be the handles, though that's a possibility too.
Again, using the syringe part of the bleed kit you could apply pressure direct to the lines. IF that's not moving the pistons, it's the caliper. If it is moving the pistons, it's the handle.