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Dry metal sound from front wheel

Discussion in 'Technical and Troubleshooting Torque' started by C15CO, May 8, 2012.

  1. Hi,

    Just got my bike back on the road after having to rebuild the engine and i'm not sure if this is due to it sitting still for two months but now there is a dry metallic sound coming from the front end.

    The sound is constantly there regardless of breaking or acceleration but does increase in volume with speed.

    Do I need a new front bearing?

    Is it dangerous to ride? After the rear wheel lock up, i'm not keen to try a front wheel.
  2. Pads worn?
  3. I had ruled this out as the sound is present even when I'm not breaking (is this wrong).

    I have about 5mm of pads left
  4. sounds suspiciously like front wheel bearings to me....
    • Like Like x 1
  5. Is this dangerous
  6. If you keep riding with it like that; if the bearing collapses altogether it can then rip the metal out of your front wheel and cause the bike to become unstable.

    So, here's what to do.

    Assuming the CB400 has a centre-stand, get it up on the stand.

    Don't start the engine

    get someone to apply his weight to the back of the seat and lift the front wheel off the ground, spin the wheel with your hand and get your head down near the front axle and listen.

    If the grinding noise comes from there, go to your mechanic...
  7. Pads can rub gently on the disk and make a grating sort of noise even when not braking. In fact normally I would expect it to go away as you applied brakes and the pads engage properly.

    Sounds like wheel bearing but I would certainly check pads first to eliminate them.
  8. Excessive heat in the disk will occur when pads are rubbing. Also make sure the calliper isn't rubbing on the disk; that definitely sounds like a "dry metal sound", my dealers mechanic sent me away from the shop with that happening after a tyre change... I change my own tyres nowadays.
  9. Thanks for the advice guys. I'll keep her off the road until I check if it's the pads or bearings
  10. I'm with Hornet on this one. The other thing is the speedo drive (if it is driven off the front wheel).

    continuing to ride with either of these damaged will to expensive damage to other bits.

    Bearing replacement is fairly easy and the bearings are cheap parts.
  11. Oh, maybe it is the speedo (it is driven off the front wheel). I got the bike a few months ago, and the speedo has always been out by 20kms