S40 finally assembled and ready!

Roger Underhill

Roger Underhill

Member
Pollock said:
I did notice that as I tightened the bolts, it pulls the entire brake back towards the outside just a bit. Visually inspecting the brakes, it is the inside pad that seems to be the bigger problem. I do have both of the pad adjustments screws backed out all the way; it I turn them even a quarter turn, the wheel spins less freely.

I am contemplating pulling the pads on the rear brake and then reseating them. As they are now, I don’t see enough of a gap for the rotor to spin freely from the pads. I will say, it feels like I am missing something easy and fundamental.
Click to expand...
They say 30 actuation to bed in too
I suspect the mounts are not ‘faced’ accurately enough and so the pads my not be parallel to the rotor. They may ‘wear’ into place, I think
 
Balor

Balor

Zen MBB Master
"Bedding in" is mostly about depositing a transfer layer on the disk. Sram hemispherical washers are good for eliminating small misalignment.
 
T

tiltmaniac

Zen MBB Master
Brake adjustment:

I've had to face my brake mounts on one fork to get things working well (athis is a last resort kinda thing to do).

I also had to put in new pads, as the old ones had worn asymmetrically (slanted). Check the pads to see if they are wearing 'flat' or just put some new ones on when adjusting.

Lastly, I found my brake bolts had warped, which caused the brake to move around while being screwed/tightened in. Check for that too.
 
Roger Underhill

Roger Underhill

Member
I
super slim said:
30 actuation, means riding up to 20 kph (13 mph) 30 times and applying the brakes to stop the bike, gently slowing down to 5 kph, then accelerate to 20 kph

https://cyclingtips.com/2018/03/road-disc-brake-bed-in-process-end-vibrating-noise/
Click to expand...
I just got the vibrating brakes he mentioned after a steep descent. I need to keep an eye in this and my braking... thx for the post. I thought maybe I’d warped my rotor but it sounds like it might be this transfer thing. Never had it in all my years of mountain biking. Probably road compound pads as mentioned.
 
P

Pollock

Guru
Roger, I just had the a vibration sound on mine as well. Best way to explain it is as it you use a bit of water on the lip of a thin glass to make it vibrate with resonance; similar sound.

I will keep fighting with mine for a few more weeks. If I cannot get them working well, I’ll take it to the bike shop so I don’t worry about them on longer rides right now. I really want to learn how to maintain the brakes for when things go wrong on a long ride or tour.
 
Roger Underhill

Roger Underhill

Member
Pollock said:
Roger, I just had the a vibration sound on mine as well. Best way to explain it is as it you use a bit of water on the lip of a thin glass to make it vibrate with resonance; similar sound.

I will keep fighting with mine for a few more weeks. If I cannot get them working well, I’ll take it to the bike shop so I don’t worry about them on longer rides right now. I really want to learn how to maintain the brakes for when things go wrong on a long ride or tour.
Click to expand...
Yes. I will monitor. It’s not consistent. As you say it could be a variant of squeal but from the frequency and abruptness of the sound I suspect something related to the cutouts in the rotor or a deposit on the rotor. Maybe ;) I remember a friend removing a small stone that became lodged in his car brake pad and gave rise to a similar effect. So a close inspection may be in order.
 
You must log in or register to reply here.
visit our website visit our website
Top