Strange noise

[arctine]

Just got back from a short ride in the sun.

Was riding down a country lane and it was slightly muddy, I guess. Anyway, all of a sudden, upon descending a hill, there was a strange noise coming from the back wheel. It was quite loud and sounded like the wheel had picked up a twig or some stones and they hit the mudguard or something. The sound stopped. I carried on riding for a bit and it came back so I pulled over.

I rocked the bike back and forth and narrowed the noise down to definitely being around the back wheel. It sounded like a creaking noise, as if metal was being stretched, so I checked the chain wasn't too tight and it was fine. I then realised it only happened when the bike was moving forwards. I looked at the back brake and couldn't see anything wrong. I checked all around the wheel and there was nothing that stuck out or looked suspicious.

I got back on the bike and rode slowly a few yards listening carefully. I then started applying the back brake stiffly to check it was working properly. As far as I could tell, it was. Anyway this got rid of the noise so I presumed it must have been some muck between the brake pads and the discs so I rode home.

When I got home I rocked the bike back and forwards again and there was a different noise that I've never noticed before. It sounds like rubber catching on something and it happens which ever way the back wheel is turning. There is nothing catching the tyre and the wheel spins freely as far as I can tell. I checked the chain wasn't just rubbing on something and couldn't find anything.

I'm lost, any ideas please? Thanks in advance.

 

[arctine]

Yeah I'll go have a look now.

My other thought is that when tightening the chain the other day, I may have tightened the axel bolt too much? Is that possible.

 

[arctine]

It is possible I suppose, have you got a torque wrench to tighten it with, along with the torque rating?

Nah. I tightened it by hand so I'm skeptical as to how possible it is that it could be too tight.

I just hope this isn't something serious like bearings

 

[arctine]

Just looked at the brake and found out what the loud noise was when riding. Though I'm not sure why the noise stopped

One of the pads is worn completely down on one half and so it's now metal against the disc

Why would the pads wear unevenly? The one pad is fine and like I said, only half the other pad is worn.

I did notice when putting the pads back in, there's like a spring at the bottom of the calliper which pushes the pads back against the piston when they're moved. The spring on the worn pad's side doesn't push it back. I'm can't see why either.

My guess would be this is the reason the pad has worn unevenly and quicker than the other one, because it's being pushed back into place when the brake is released.

I'm no mechanic though, anyone with a bit more knowledge got any ideas?

Oh and the squeeking noise is still there when the brake calliper is removed. I think this might just be a natural noise the bike makes that I haven't noticed before now though.

 

[arctine]

could be a wheel bearing on its way out,lift back wheel off ground and hold the wheel in the 12 and 6 o clock position and pull and push it towards you,if any movement chances are its a wheel bearing

for your brake caliper use some wd40 on the piston and push back in and pump the piston in and out a few times to loosen it up abit,could be sticking slightly hence the uneven wear

could also be the rubber cush drives in/under the sprocket carrier

Cheers for the info.

I'm gonna take all three callipers off and get my brother to rebuild them with new pistons and seals. Obviously I'll bleed the system and change the pads while I'm at it. I'm guessing it hasn't ever been done because the bikes only traveled 13k. I've only done 1k of that.

I'll take a look at the cush drives as well. I need to change the chain anyway so I may as change the sprockets and cush rubbers as well.

May as well do the radiator coolant and oil/filter while she's off the road.

Turning into a full service now