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Brake shudder SRAM AXS Caliper Centerline XR Rotors w/ organic pads

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Brake shudder SRAM AXS Caliper Centerline XR Rotors w/ organic pads

Old 08-10-23, 10:45 AM
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Brake shudder SRAM AXS Caliper Centerline XR Rotors w/ organic pads

So my Specialized Aethos w/ 300 miles front brake has been having some shuddering issues that is non headset related. At lower speeds when using the front brake the disc would slightly shudder and then squeal a little.

* My first solution was to clean the rotor with some isopropyl alcohol and check the headset (fine) and then check the center lock torque at 40nm (fine), but this did nothing
* I then changed to a new set of pads and same problem.
* I then changed to a whole new set of pads and rotor (perfectly true) and after I bedded in the brakes this seemed fine for the first 50 miles
* Just as I finished my last ride last weekend my brake started to slightly shudder (but not squeal) at lower speeds.

At this point I am a bit miffed and I am just guessing that there could be a piston leak in the caliber even though I didn't see any DOT fluid when I changed the pads. Should I go ahead and try to RMA the caliper and swap it out or is there something else I could try? Or is 50 miles on a new set of pads/rotor just too little to tell?
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Old 08-10-23, 12:19 PM
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Suggested next steps:

- confirm the rotor is tight on the hub - 6 bolts for ISO, or lockring for center lock

- and then do the "align caliper" routine. Loosen the two caliper screws and then retighten / re-torque them with the brake lever clamped down

report back please

/markp
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Old 08-11-23, 08:19 AM
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Originally Posted by mpetry912
Suggested next steps:

- confirm the rotor is tight on the hub - 6 bolts for ISO, or lockring for center lock

- and then do the "align caliper" routine. Loosen the two caliper screws and then retighten / re-torque them with the brake lever clamped down

report back please

/markp
Both those things where done from the beginning with the locking being torqued to 40nm and the caliper and rotor aligned with the 2nd rotor being true of the box which is a surprise for SRAM rotors. To your point I had a rotor/wheel shudder once on a separate bike because a LBS put on a new wheelset for me and transferred my rotors from my old wheelset but didn't torque down the rotors fully, but this is not the case since I checked the torque and alignment myself on this bike

Tonight I took out the pads and slightly sanded them down and cleaned them with Isopropyl Alcohol. Inspected the backs of the pads for DOT rings or residue and checked the caliper as a whole for any DOT residue and nothing could be found. I cleaned the caliper and piston surfaces and made sure they were recessed. I am going to ride this bike this weekend and see if this helped or if this keeps persisting. I ordered a replacement caliper just in case, granted the caliper on their might be fine
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