Disc brake catching

Hi, i'm looking for some suggestions to solve the following problem please:
I have a new bike with disc brakes. The front brake seems to be touching something once every revolution. However, when I touch the brake lever the catching stops. It is almost as though the brake pads have some slack or play in the caliper and they are touching the rotor. As soon as the slack is taken up by touching, not pulling, the brake lever the noise stops. Can anyone relate to this and explain how to remove the 'slack' on the pads and hopefully resolve the problem?
Incidently, when I get off the bike and spin the wheel the noise is not present - I only get the noise when riding the bike?!!
Thanks
I have a new bike with disc brakes. The front brake seems to be touching something once every revolution. However, when I touch the brake lever the catching stops. It is almost as though the brake pads have some slack or play in the caliper and they are touching the rotor. As soon as the slack is taken up by touching, not pulling, the brake lever the noise stops. Can anyone relate to this and explain how to remove the 'slack' on the pads and hopefully resolve the problem?
Incidently, when I get off the bike and spin the wheel the noise is not present - I only get the noise when riding the bike?!!
Thanks
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retired 9.6kg Carrera Kraken
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You don't give enough info. Are the brakes Hydraulic or mechanical?
Depending on the brand, with Hydraulic disc there is about 1/2 to 1mm clearance between pads and discs so they should not touch, on or off the bike.
Are callipers centred? Is there any runout in the disc?
Is the wheel fitted correctly and skewer tightened, this may explain the noise when bike is ridden and not.
How long can I expect this to continue? 50 miles, 100 miles?
What do you mean by 'run out in disc'? Will check the alignment of caliper and ensure the wheel is correctly fitted.
To see this look at the outermost disc edge running in the gap in the calliper.
In theory there shouldn't be but in practise it is not too difficult to knock a brake disc due to careless handling.
The wheels should spin soundlessly, except for the freehub ratchet obviously.
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If it is bothering you it may be worth realigning the caliper to try and improve the clearance between pads and rotor. Before doing that though try removing and refitting the wheel just in case it is slightly out of line.
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retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build