Strange creaking/ticking with new brake

Unicycles and Equipment
1

Hi, I have just installed a shimano 4 pot brake onto my Hatchet 26er, however with this new brake installed it is making a strange ticking sort of sound when braking or when just spinning freely? What may be causing this, I had thought it may have been the larger caliper fouling on something, however I cannot see anything obvious it is touching. Any help would be appreciated :clap:
I have attached a video of both under braking and when spinning in the air if it is of any help :smiley:


2

Have you really tightened all the screws? Including the adapter screws? Or the metal clamp on the pads, which can also grind. Otherwise, just slow down. I hope I was able to help you a little.

1 Like
3

I am not an expert. As you certainly did, I would start turning the uni upside down and watching the gap carefully while manually rotating the wheel, performing the following tests:
Is the disc itself rotating straight and in the center of the brake? Does the outside of the disc touch something (radial runout)? When you pull the brake (tested at all rotation angles), in which direction is the disc shifted, does it touch something? Do you have play in the bearings which allows the disc to move while heavy brake forces are present? How does the brake release, does it still grind? Does it get better with slightly worn out brake pads? Or use a thinner disc? Does the crank or do the spokes touch the brake body (it sounds like spokes are touching your brake body and sometimes the crank hits the other side)?
After rebuilding the brake screws to put the brake pipe to the vent screw and filing the brake body I have 1mm to the pedal and 1mm space to the spokes:

be7d291ad84801c655efde954ab2ab8880f6d309
be7d291ad84801c655efde954ab2ab8880f6d309800×450 44.6 KB

30f8f33100ede83475d87ddaed171d5b2ad6bf38
30f8f33100ede83475d87ddaed171d5b2ad6bf38338×600 30.9 KB

4

I seem to remember that I had to put a washer under the brake calliper of my hatchet as the edge of the disc was scuffing on the inside of the calliper making a ticking noise.

5

I hear noises like this when metal rubs against metal.

3 possible causes:

  1. Brake disc too high and rubbing against the brake. Remedy: Add a washer under the brake caliper to create more clearance. Or choose a combination that works. I’ve had this problem, for example, with cheap discs combined with Shimano.

  2. Screws for IS-PM adapter are too long and the ends rub against the brake disc. Remedy: Either shorten the screws or install a washer on the outside.

  3. IS-PM adapter rubs against the disc. This is usually just a fraction of a millimeter. If all else fails, carefully file the adapter down a bit or look for a different model.

These 3 things caused these noises for me. Definitely try aligning the brake again and only try the above steps if it really doesn’t help.