lamptramp Posted March 1, 2014 Report Share Posted March 1, 2014 Just learning more as I go along about the well worn 2002 315R that I bought recently and noticed that both the front and rear brake discs have a fair bit of movement in them. When you lock the disc, the wheel can still move. Roughly speaking, the disc moves on its mounting nuts by a couple of millimetres. Should there be any rotational play (can't think why) in the discs or are they just buggered? Thanks Quote Link to comment Share on other sites More sharing options...
nelly1 Posted March 1, 2014 Report Share Posted March 1, 2014 no its as it should be called floating disc something to do with expansion Quote Link to comment Share on other sites More sharing options...
lamptramp Posted March 1, 2014 Author Report Share Posted March 1, 2014 no its as it should be called floating disc something to do with expansion But isn't the floating only supposed to happen in the sideways axis, with no rotational movement? Quote Link to comment Share on other sites More sharing options...
lestergg2005 Posted March 1, 2014 Report Share Posted March 1, 2014 If your concerned about rotational axis try replacing the small collars that sit inside the mounting holes in the disc. Quote Link to comment Share on other sites More sharing options...
nelly1 Posted March 1, 2014 Report Share Posted March 1, 2014 i could have just said they are all like that mate Quote Link to comment Share on other sites More sharing options...
guys Posted March 1, 2014 Report Share Posted March 1, 2014 Just learning more as I go along about the well worn 2002 315R that I bought recently and noticed that both the front and rear brake discs have a fair bit of movement in them. When you lock the disc, the wheel can still move. Roughly speaking, the disc moves on its mounting nuts by a couple of millimetres. Should there be any rotational play (can't think why) in the discs or are they just buggered? Thanks As nelly stated this is normal, even a small amount of rotanional (radial) play is normal. The axial play is there to allows the disc to line itself with the brake pads for a quick and sensitive brake feel. Also when you brake the forks twist a little bit, the floating disc compensates this movement. 1 Quote Link to comment Share on other sites More sharing options...
lamptramp Posted March 1, 2014 Author Report Share Posted March 1, 2014 As nelly stated this is normal, even a small amount of rotanional (radial) play is normal. The axial play is there to allows the disc to line itself with the brake pads for a quick and sensitive brake feel. Also when you brake the forks twist a little bit, the floating disc compensates this movement. Well that's fine then! Just looking for ways to make the bike compensate even further for the below average rider, guess I'll need to look elsewhere for such improvements... Thanks to all for your advice. Steve 1 Quote Link to comment Share on other sites More sharing options...
axulsuv Posted March 1, 2014 Report Share Posted March 1, 2014 They are supposed to float , but on my 97 section I Think I need to replace the mount bushings , as mine rattles quite annoyingly when stone cold ... Or do I just live with it as the brakes are fantastic ...? Glenn Quote Link to comment Share on other sites More sharing options...
tlrmark Posted March 1, 2014 Report Share Posted March 1, 2014 The brake discs on your fantic came that way from the factory glen. Changing the bushings will make no difference. The 38mm Paioli fork, ajp wheel hubs and brake discs on your 90's era fantic are exactly the same parts on the 97-99 montesa 315 incidently. 2 Quote Link to comment Share on other sites More sharing options...
axulsuv Posted March 1, 2014 Report Share Posted March 1, 2014 The things I learn on the interweb ... Thanks, Glenn Quote Link to comment Share on other sites More sharing options...
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