ASTANA Posted March 30, 2009 Posted March 30, 2009 hey Roadie turned part time mtb'er. Need some advice on Disc brakes. How do I set them correctly so that the disk don't rub against the pad when I ride or turn the wheel. Know the trick where you loosen the bolt's of the brake caliper and then turn the wheel break and hold it in and then fasten the bolts again. but it seems that the one disk might be of center or something cause this does not work. When I fasten the bolt i can see the caliper moving back to its original position. Can I take the pads out and check them or something. plz explain, want to be able to fulle raplace it after I took it appart.
wesleigh Posted March 30, 2009 Posted March 30, 2009 Buy Fundamentals DVD, that will help you with riding, setting up your bike and your suspension.
AndreZA Posted March 30, 2009 Posted March 30, 2009 I have a small torch that can stand on it's rear. I place this below the caliper so that the light shines through the caliper. I then rotate the wheel to where it catches and keep in in between the brake pads. Undo the bolts, reposition the caliper and keep on doing so until there are no more places it touches. .
kennyg Posted March 30, 2009 Posted March 30, 2009 1. Check that the spring that pushes the pads apart is still correctly mounted in the caliper.2. Check your disc, it may be out of line 3. Check the disc mounts are tight, if not a centre lock, Thats your best diagnosis start point...
no.one.knows Posted March 30, 2009 Posted March 30, 2009 or just buy a disc truing fork. and the fundamentals DVD and you'll be good.
quickdraw Posted March 30, 2009 Posted March 30, 2009 What type of brakes is it.Could try using new washers or v-bake jobbies if they are avids. clean it all off and add a smidgen of grease. Sometimes the washers, etc gets an imprint from the previous setting so when you tighten the mounting bolts the caliper shifts back to the previous imprints. Also tighten them very slowly and alternating between bolts in small increments.
ASTANA Posted March 30, 2009 Author Posted March 30, 2009 Shimano M575 Disc 180/160 mm SLX If I look through the caliper I can see the one pad with lots of clearance and the other one is touching the disk/rotor
Canaris Posted March 30, 2009 Posted March 30, 2009 I have a small torch that can stand on it's rear. I place this below the caliper so that the light shines through the caliper. I then rotate the wheel to where it catches and keep in in between the brake pads. Undo the bolts' date=' reposition the caliper and keep on doing so until there are no more places it touches. .[/quote'] you have a lot of time on your hands. Consider a disc truing fork or a shifting spaner wraped in paper towel to tweek the disc. It may be easier than repostioning a caliper on a bent disc.
Brettski Posted March 30, 2009 Posted March 30, 2009 An easy trick is to take a business card, fold it over the rotor. make sure the caliper bolts are loose, push the rotor with the folded business card between the pads. Pull on the brake lever, and while the lever is pulled, tighten the caliper bolts. This should automatically leave a small gap either side between the pad and rotor. If your breaks still rub at various places along the rotor, your rotor is warped and needs to be trued.
AndreZA Posted March 30, 2009 Posted March 30, 2009 An easy trick is to take a business card' date=' fold it over the rotor. make sure the caliper bolts are loose, push the rotor with the folded business card between the pads. Pull on the brake lever, and while the lever is pulled, tighten the caliper bolts. This should automatically leave a small gap either side between the pad and rotor. If your breaks still rub at various places along the rotor, your rotor is warped and needs to be trued.[/quote'] but when do you pull the brake, when the disc buckles to the left or to the right? .
ASTANA Posted March 30, 2009 Author Posted March 30, 2009 Astana' date=' it is post mount or ISO mount. i.e. d[/quote'] ?? A what - can you eat that ? I have no idea what ur talking about sorry, not being rude - enlighten me plz. I know the business card trick, but cant fit the card on the one side - its to tight (did loosen the bolts)
ASTANA Posted March 30, 2009 Author Posted March 30, 2009 An easy trick is to take a business card' date=' fold it over the rotor. make sure the caliper bolts are loose, push the rotor with the folded business card between the pads. Pull on the brake lever, and while the lever is pulled, tighten the caliper bolts. This should automatically leave a small gap either side between the pad and rotor. If your breaks still rub at various places along the rotor, your rotor is warped and needs to be trued.[/quote'] but when do you pull the brake, when the disc buckles to the left or to the right? . The disk look fine - aligned and everything. the caliper just need to move closer to the wheel (inside to compensate for the space on the outside)
Brettski Posted March 30, 2009 Posted March 30, 2009 When you pull the brake, do both the pads move, ie. the outside and inside pad?
Bike Mob Posted March 30, 2009 Posted March 30, 2009 loosen the bolts and push it the way it needs to go... the bolt holes are elliptical so you can slide it side to side. I loosen mine just a touch so it's hard to slide, otherwise they go all over the place. I also tighten up the bolts slowly and incrementally while checking the pad clearance. Sometimes the bolt grabs the caliper and pushes it while tightening.
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