Frustrating Caliper Alignment Issue

[batman1425]

Facing does seem unlikely on a Moots given their attention to detail and quality control, but, it happens. Shimano brakes tend to have better pad clearance when retracted than Sram so it might not be off enough to create an issue with the previous build up, but be out just enough out to create issues with a Sram caliper. If it has only had Shimano brakes till now, could have gotten missed for that reason.

IMO, either the mount needs to be faced, or the rotor shimmed. I'd try the shim first and see if kicking the rotor outboard a few 0.1mm makes it work.

[Epicus07]

A rotor shim would be counterproductive as it would move the rotor
further outboard and I need it to move inboard.

I’ll take it to my LBS

[Carbonita]

I had a similar issue...paint overspray on the faces was the cause. Maybe a moot(s) point here?

[MikeD]

One of my calipers moves while tightening the bolts. I have used the technique of eyeballing the gap between the pads and the rotor, and holding the caliper in place while tightening the bolts.

[prototoast]

I use feeler gauges to shim between the brake pad and the rotor when tightening the caliper. The different thicknesses allow me to adjust how much extra I want to push the caliper to one side.

[batman1425]

Originally Posted by Epicus07

A rotor shim would be counterproductive as it would move the rotor
further outboard and I need it to move inboard.

I’ll take it to my LBS

Yep, just realized I was thinking about this backwards to your description. Facing is the next step I think.

[weisan]

When I encountered a situation like this, the only way I can get it to work (other than getting rid of disc and going back to rim brake) is using a rotor tool to bend the rotor ever so slightly to move it away from the side that is rubbing. It takes a light touch and patience. almost like truing a wheel.

[vespasianus]

Originally Posted by windsurfer

If the caliper is shifting when you tighten it, the mounts need to be faced. Could be the caliper, the frame, or both that are not flat or at the right angle. Once you get this right adjustment will be easy. Dykem will help.

I agree with the above but I would remove the pads, make sure the brake pistons are clean and pushed back all the way, put back the pads and reinstall the wheel. Look to see if the rotor is centered and that pads hit the rotor evenly and pull back evenly.

If it is tilted toward the side, it is mount and you will need to have it faced.

[lorenbike]

Originally Posted by weisan

When I encountered a situation like this, the only way I can get it to work (other than getting rid of disc and going back to rim brake) is using a rotor tool to bend the rotor ever so slightly to move it away from the side that is rubbing. It takes a light touch and patience. almost like truing a wheel.

A crescent wrench works fine too for disc rotors.

[Gummee]

Originally Posted by unterhausen

Even though it's Moots, everybody makes a mistake from time to time. I would take it to the lbs that I trust.

I AM an LBS and sometimes 'it' happens.

Try adding another washer on the fixing bolts.

Seems to keep things rotating smoothly and not moving while you're tightening

M

[novacyclist]

Not sure if this was suggested earlier but I like to have the bolt just loose enough, set the bike on the ground, hold the brake lever and then tighten. It has worked every time for me.