Sqweeky brake

[slugger_2003]

Hi all.

I recently bought a bike and today I noticed a sqweeking noise coming from the rear of the bike. If I lift the bike and spin the rear wheel it spins a lot less freely than the front wheel and makes a sqweeking noise about every half turn.
Does this indicate a buckled wheel or do I just need to slacken the brake?
Any info appreciated and also a "how to" if possible.
The rear calliper says "Tektro" and they are disc brakes. The bike is a GT Agressor XC2, bought last year. The brakes are not hydrolic as you see on some XC2's.

Thanks

 

[spandex]

If the bike is under a year old take it back to the shop and tell them what is wrong. It is a buckled wheel have a read of this http://www.sheldonbrown.com/tooltips/truing.html

 

[slugger_2003]

It's over a year old and I bought it second hand although the warranty is being transferred over to me for the remaining year and a half. Don't really know how much the warrenty covers however. It's from Halfords so I'd imagine it would be minimal

 

[Winchy]

Some Advice: NEVER buy bikes from Halfords! They are rubbish. After 4 months I started to have problems with my bike that I bought!

 

[Blonde]

If the brake is rubbing it could be that the brake arm/caliper is dirty/rusty at the pivot point where it attaches to the bike, so it is not returning (springing back out again) once you have braked and is now stuck on (in which case you just need to unbolt it, clean and regrease it), or that the brake return spring is damaged or not in the correct place (if you have V brakes the springs should be pushed behind the brake and behind the little peg which holds the spring back), or it could be that the rear wheel is out of 'true'. If wheel is out of true you can true it yourself using a spoke tensioning key or have your LBS do it for you. The wheel should not actually squeak when the brake rubs it though, only rub and stop more quickly. A squeaking sound is usually caused by spilled grease on the rim (often from your chain) which you can wipe off with a soapy wet cloth.

 

[Young Un]

he has disk brakes blonde

 

[Blonde]

Sorry - didn't read properly!