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I've had these brakes for a few years. Yesterday I fitted new pads and stripped them down to clean. I've put them back together but I can't seem to get them centred unless I really torque them up which makes them bind and not open back up. Can't seem to find any instructions. Anyone know anything about these
It's been a while - is there a tiny grub screw (or two?) somewhere on the central "barrel" that you can get to with an allen key?
There's a grub screw on the side that pushes on the spring IIRC that balances the spring tension side to side. Easier just to hold them still with one Allen key and do them up with another so they're straight to start with (TBH I do all road brakes like that because I'm lazy and it works).
I'm pretty sure there's at least one grub screw on the barrel too - set and fit the brake approximately centred using the mount bolt and then loosen the screw and properly centre either by hand or, err, some other way
Unless that's some other brand. I have def used p-x ones at some point though
here, this sounds like what I found:
Well, I think I've finally got it. I have to admit that even though the alignment (centering) of the brake was off initially, I probably made things worse when I first started trying to fix it.
I decided to sit down and a really figure out how these brakes are put together. I took the brake apart just to figure out what the bolts are actually doing.
First observation - That big shiny allen bolt on the front is used to keep the calipers together. Loosening that allen bolt creates 'play' between the calipers, and tightening that bolt causes 'binding' of the calipers (they won't return properly). The moral of this observation... this bolt should not be used to center the caliper.
Second observation - As Hopper 1 correctly identified, the 13mm bolt behind the caliper is used to center the brake. However, to do so, it has to first be fastened tightly against the calipers (mine wasn't) before it can be used to center the calipers. This was really the source of my alignment issue.
Third observation - The 2 grub screws on the 13mm bolt should be loosened. If not, adjusting the 13mm bolt will also cause that big shiny allen bolt to move too (which is a bad thing; see first observation).
from "https://www.bikeradar.com/forums/viewtopic.php?t=12762723"
(and channeling the "line spacing" thread just as an experiment)
THANK - Lots of info on that thread.
I'll grab a cone spanner and see if that works