• My discs on my gravel bike (GRX calipers) are making a weird noise under heavy braking. Brakes still seem to work well but the noise is a bit odd.

    Best I can describe it is the bubbling noise that a water cooler makes after you use it…pads don’t look worn and performance is still there. Any ideas?

  • Like 'zer zer zer zer' ?

    Can be quite a few problem, check that the caliper is tight, rotor bolts not loose, take pads out and check for uneven wear and if pads are correct fit for caliper.

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