[Sandwich]

SRAM Force AXS etap, road group

flat mount

6bolt rotors adapted to centerlock hubs

carbon frame

everything is brand new. I have bedded in the pads and rotors according to SRAM's suggestion- 20 repeated medium speed stops, 6 high speed stops, rest. The rear is still squeeling relentlessly. I have had quiet HOPEs, Hayes, Shimanos, Formulas, and Maguras. I'm 0/1 on SRAM. What gives?

 

[Jm_]

This is happening all over the place with all brands of brakes these days.

What's happening is your pads and/or rotor are vibrating.

What fixes it depends. Gotta change that frequency. Different pads, different rotor (to 2-piece or a different style) , different adapter, pads that have the little fins from kool-stop to operate like balance weights that come on some automotive pads, adding stick-on-weights to the caliper or if possible, the pads (but probably not). I've seen some interesting mods to Specialized stumpys that are particularly susceptible to this.

In any case, this seems to be happening more and more, all/most brands.

 

[Sandwich]

I'm hoping to find an easy solution (tighten the bolts, clean the rotor, spit in the wind, piss on the electric fence) before I buy new pads to replace my new pads or new rotors to replace my new rotors. I will if I have to, but this is just ridiculous.

 

[johnbryanpeters]

Spray rotors with WD-40.

 

[Jm_]

I'm hoping to find an easy solution (tighten the bolts, clean the rotor, spit in the wind, piss on the electric fence) before I buy new pads to replace my new pads or new rotors to replace my new rotors. I will if I have to, but this is just ridiculous.

Warranty those bitches, shoot a video, document it, send them a registered letter return receipt asking for them to fix the problem or give you your money back. If they fail to do that, file in small claims court, unlikely they'll send anyone to answer in the state you file it in. Best case you get on Judge Judy.

 

[jonKranked]

This is happening all over the place with all brands of brakes these days.

What's happening is your pads and/or rotor are vibrating.

What fixes it depends. Gotta change that frequency. Different pads, different rotor (to 2-piece or a different style) , different adapter, pads that have the little fins from kool-stop to operate like balance weights that come on some automotive pads, adding stick-on-weights to the caliper or if possible, the pads (but probably not). I've seen some interesting mods to Specialized stumpys that are particularly susceptible to this.

In any case, this seems to be happening more and more, all/most brands.

first thing i'd do is check, double check, and triple check the alignment between caliper/pads/rotor. i gave up on sram brakes years ago, do you still need to push pistons back in?

 

[jonKranked]

another option - swap pads or rotors front to back and see if that makes a difference.

 

[jonKranked]

if the pads are symmetrical you can also try to swap them L to R.

but knowing sram probably not.

 

[Jm_]

Then try it now.

 

[Westy]

Never needed to try it but for cars antisqueal grease, adhesive or other material is added between the pad and the piston to change the friction characteristics that influences squeal. I wouldn't put any grease near bike brakes but perhaps sanding the back of the pad to change the friction characteristics would help. Just doing one side might be more effective than both as a resonance usually occurs when everything acts in concert with each other, having different characteristics could prevent that.

 

[Jm_]

Never needed to try it but for cars antisqueal grease, adhesive or other material is added between the pad and the piston to change the friction characteristics that influences squeal. I wouldn't put any grease near bike brakes but perhaps sanding the back of the pad to change the friction characteristics would help. Just doing one side might be more effective than both as a resonance usually occurs when everything acts in concert with each other, having different characteristics could prevent that.

Yep, comes with all new brake pads for cars.

 

[englertracing]

High-tech Axxios AXS Anti-Vibration System on Commencal DH Bikes

Thibaut Ruffin asked us to come check out some new tech on the Commencal DH bikes. We're not entirely clear on how it's supposed to work, but it's a circuit of some kind (not a counterweight) that takes information from the surface it's mounted...

www.vitalmtb.com

 

[6thElement]

How many shims have you got?






You should probably add more.

 

[Jm_]

High-tech Axxios AXS Anti-Vibration System on Commencal DH Bikes

Thibaut Ruffin asked us to come check out some new tech on the Commencal DH bikes. We're not entirely clear on how it's supposed to work, but it's a circuit of some kind (not a counterweight) that takes information from the surface it's mounted...

www.vitalmtb.com

 

[MikeD]

Small nylon washers under rotor mount bolts, and/or caliper bolts?

I might do light brake grease on back of pad, but if not, some kind of sticker there?

 

[canadmos]

Aren't squawking brakes a feature on srams?

Maybe try an actual center bolt rotor...

 

[rideit]

Did this thread title fuck up the format size of the new posts page for anyone else?

 

[Jm_]

Yes, Sandwich broke RM.

 

[Sandwich]

Aren't squawking brakes a feature on srams?

Maybe try an actual center bolt rotor...

if cleaning the rotors and sanding the pads didn't help, this is my next step. if that does work I'll buy the correct rotors.

 

[englertracing]

I bet a sandwich it won't

 

[Sandwich]

new rotors or sanding the pads? I don't think it will work either, but one step at a tme.

 

[Westy]

new rotors or sanding the pads? I don't think it will work either, but one step at a tme.

Make sure to start a new thread for each step.

 

[Leafy]

Never needed to try it but for cars antisqueal grease, adhesive or other material is added between the pad and the piston to change the friction characteristics that influences squeal. I wouldn't put any grease near bike brakes but perhaps sanding the back of the pad to change the friction characteristics would help. Just doing one side might be more effective than both as a resonance usually occurs when everything acts in concert with each other, having different characteristics could prevent that.

They also make anaerobic high temp adhesive for this. It cures the first time you put pressure on the brakes, only where theres contact between the pad and piston.

 

[ebarker9]

I have this with Shimano road hydros as well. Went through thorough cleaning of pads and rotors. Seemed to help for a little while but came back shortly after. Thinking of trying resin pads because there's nothing resembling an extended descent around here.

 

[Sandwich]

I bet a sandwich it won't

you owe me a sandwich, it helped significantly

Make sure to start a new thread for each step.

working on it, just debating what forum

I have this with Shimano road hydros as well. Went through thorough cleaning of pads and rotors. Seemed to help for a little while but came back shortly after. Thinking of trying resin pads because there's nothing resembling an extended descent around here.

interesting, and good to hear. Mine may have been related to some degree of road grime. I cleaned the rotors with IPA, then sanded the pads vertically across the brake surface. Dramatic reduction in noise.

I believe the SRAM brakes come with resin pads already, but I might try some cheap chinese pads to throw opposite the resin ones to have a one and one scenario. That's much cheaper than new rotors and easier than dealing with tacky brake pad goo (which I've tried on hopes in the past...).

 

[StiHacka]

I cleaned the rotors with IPA

 

[slimshady]

I cleaned the rotors with IPA

There you have it. According to @SkaredShtles , you should be using NEWCASTLE!!!

 

[SkaredShtles]

There you have it. According to @SkaredShtles , you should be using NEWCASTLE!!!

Fucking Newcastle...