Member19 July 2009 at 9:01 pm
can anyone give me some helpful tips on how to centre my discs between the calipers.Reason been i’ve just checked my formula oro k18 pads after 200 miles and was shocked to find that one pad front and rear where almost ready to cut a nice new groove in my discs .While the opposite pad wasnt too bad.
they came as standard fit on my zesty 314 and took it for granted they where set up right from ‘we love lapierre’ I also was daft enought to think they would put some decent pads in.Surely i should have got more use out of them than a couple of rides a week since the beginning of june.
Member19 July 2009 at 9:29 pm
I tend to get uneven wear on pads in Deore and Juicy 5s, but use sintered pads so last so long I cant keep track of how many miles, not really a problem. Defo more than 300 tho I think, even in bad conditions.
I once went though 2 sets of organic on a wet Dalby ride 😯
Member20 July 2009 at 4:54 pm
Yeah it was after yesterdays trip round Dalby that finished my pads off to.They started off ok but once the rain started and the grit got amongst everything they were screaming by the end of red route.Lesson learnt and have ordered 4 prs of red ceramic for £40 off flea bay.
Member20 July 2009 at 6:23 pm
Simple starter for centering your brake is undo the bolts that allow you to move the caliper position and put the brake on and tighten them up. Doesn’t always work (ok never sometimes). Sounds like one side is rubbing.
As for wear rates I get anything between 70 and 800 miles out of sintered pads. The most reliable I’ve used are Shimano’s own.
Member21 July 2009 at 2:22 am
I centred the discs on my stroker rydes and it was terrible, the discs vibrated between the pads and made a right racket, they seem to work better when they slightly rub one of the pads so they don’t vibrate.
Most people say they can’t notice the friction caused by this but I say take your brakes off completey and ride around a bit. I can notice it.
Most disc brakes are self adjusting to allow for pad wear, so I’m at a loss how to solve this problem, whatever I do the pads will always be the same distance from the discs. I’ll either have vibrating discs or slight friction. It vexes me. I’m terribly vexed. 😕
Member21 July 2009 at 6:20 pm
Am with ya there miggeth-my last set of brakes where stroker rydes and had similar probs.The formulas have much more solid feel than the stokers but oh for a set of disc brakes that can perform and give enough clearance without the constant friction.
Member22 July 2009 at 1:21 am
Avid Juicy 7 brakes have contact point adjustment, so you can set how far apart the pads are. It would be interesting to know if people using these can centre the discs without any friction or vibration.
Member22 July 2009 at 8:47 am
Miggeth, are your discs warped/bent? Are they mounted correctly on the hub? Is it both front and rear brakes?
Member22 July 2009 at 11:20 pm
No, they’re not warped or bent. I centred them upside down and they spin freely, with an equal distance all the way around, and yeah they’re mounted fine. The vibration only happens above a certain speed, or when I tilt the bike, or even into a strong wind.
There’s not enough room between the pads, less than 1mm more than the width of the disc, so there’s not room for any flex that might cause this.
It happens mostly at the front, but also at the back at higher speeds.
Well, it doesn’t happen at all when the discs rub one pad slightly, as long as it’s set up exactly right, the friction is minimal.
Juicy 7’s are looking very tempting though. 🙂
Member23 July 2009 at 4:01 am
I’ve figured it out Sean, one of the pistons was bleow the line of the casing with the other sticking out too far, causing the disc to touch the casing instead of the pad occasionally. I pushed them both back in, and played around with them until they both sat at about the same level. Now the disc still touches the pads occasionally but it doesn’t make a vibrating noise.
They’re pretty good brakes, if you don’t end up shearing your thumb off getting them set up correctly.
Back to the topic. I don’t know, these pads have been rubbing on one side for hundreds of miles and they still look about even. It sounds like one piston must be applying more pressure than the other under braking.
Member23 July 2009 at 10:33 am
Any rub that doesn’t really slow the wheel down won’t affect the pad wear. You can get a lazy piston so the other side tends to push the rotor to the other pad which seems to affect wear.
I know one rider who will only buy brakes if the pads can be flipped in position to use on the other side. He does a silly amount of mileage though and wears out pads at an alarming rate.
To fix lazy pistons you can try putting whatever fluid is used in the brakes on the piston if you pump them out (without pads in) and cycle them a bit. Otherwise it’s a strip down and clean and rebleed.