SRAM Centreline dreading Turkey Gobble

So my discs are doing that horrible turkey noice when braking even at low speeds. They look straight and not warped.

thinking of swapping them out but not sure what for. Or should I try new pads and try bedding in again? Maybe I glazed the pads but have not really done much heavy braking (SRAM organic pads).

if I get new pads what is the best way to pre op current discs? Seen posts about sanding them down but with what grade?

How old are they?

Only a couple of months tops.

Ah, Ok then yeah I’d try sanding them with 150-180 grit. All you’re looking for is a fresh consistent shine on the rotor, you don’t need to go mad. (if they were years old I’d just bin them as they’re probably past the min thickness) and replacing the pads. Have you checked your callipers to make sure the pistons are retracting properly, it could be that the edge of a pad is scraping on the rotor. The other (admittedly rare) thing that can happen to make the turkey noise as opposed to the normal squeal, is the pads are too far inboard and are catching the disc arms, the cure is a washer under the mounting bolt to lift the calliper so that it bites fully of the rotor. You can normally see if this is happening as there’ll be witness marks on the rotor arms.

I glazed the pads but have not really done much heavy braking

counter-intuitively its not braking hard enough on the bedding in process that glazes pads not heavy braking. When you get your new pads in there really make sure that the whole thing gets as hot as you can. Find a hill and do repeated hard stops from quite fast. and you need 15-20 stops. Don’t do a half hearted go at it.

+1 to

Find a hill and do repeated hard stops from quite fast. and you need 15-20 stops. Don’t do a half hearted go at it.

Alternatively just embrace the noise. Easier and now you don’t need a bell.

I’ve chased squeaking brakes loads of times and have just accepted the noise.

Commuter makes a weird scuffing noise
Fancy road bike- silent
Full suss hope e4- howl when wet
Hardtail v4- howl when wet
Tandem tectro v brakes squeak under hard braking
Caliper brakes road bike- occasional loud noises

20 stops from 10mph

10 stops from 15mph

I read somewhere to only do near-stops, don’t let the pads come to a standstill on the rotor.

I’ve had several sets of Sram Centreline and they all howl in various situations:

wet – howl

warm – howl

cold – squeal

applied lightly – whine

applied heavily – whine

and when they’re not whining they do what I assume is  the turkey gobble whereby they sound like the pads are catching on the cut out sections of the disc.

they also developed a gold/bronze tinge on the top edge when I followed the SRAM bedding in procedure as above,  20 slow downs then 10. As above they say not to come to a standstill as you will deposit too much pad material in one spot. The wheel needs to keep turning during this process.  Not that it makes a blind bit of difference – they still howl and obviously got very hot hence the bronze tinge. My Shimano brakes were mostly silent except first pull when raining.

I’ve just bought some Centreline XR rotors to try in the hope that the most expensive ones will be better…🤷‍♂️ One of my callipers has a lazy piston that retracts too slowly causing – yes, you guessed it a whine for a few seconds when the brakes are released so I’m going to see if I can get them replaced under warranty first.