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First post, new owner of GT4RS - I have steel brakes fitted and noticed under quite heavy braking from high speed the noise from braking is quite loud. Like a loud rumble that changes in pitch as the car slows. I’ve taken some pics of the discs for any obvious signs. Thanks.
The sound should get quieter over time. And you really should try to avoid hard use like that during bedding-in period (unless emergency). You want to slowly put down a thin layer of pad material - not quickly at high temperature.
Many people also prefer aftermarket pads (if you change, you’ll want to clean off that old pad material with Simple Green cleaner and 3M green dish cleaning pads to avoid cross-contamination of pad compounds).
The sound should get quieter over time. And you really should try to avoid hard use like that during bedding-in period (unless emergency). You want to slowly put down a thin layer of pad material - not quickly at high temperature.
Many people also prefer aftermarket pads (if you change, you’ll want to clean off that old pad material with Simple Green cleaner and 3M green dish cleaning pads to avoid cross-contamination of pad compounds).
Great, thanks for your info. I forgot to add the car is new to me but already has 3700 miles on it, surely the bedding in period is over??
You will experience this even after proper bedding. Its just a thing you have to embrace, def more of a Hate than Love thing for me. Usually you can get some miles on the car without this sound after a deep wheel/rotor cleaning.
Contrary to the opinion above, bedding is not done over time, glazing happens over time, or the wear of the bedded material after several hundreds street miles post bed-in. I bed my pads in less than a few minutes. A few soft brakes at 40ish % pedal on a clear road/highway to raise the temps slowly, then 6-8 hard presses on the pedal from 80mph down to 20... making sure I have 3-5 miles of clear road before I need to sit on the brakes for proper cooling off.
I switched to Ferodo DS2500, they are said to be fairly quiet, though mine make horror movie sounds at slower braking points on my drives. Usually a slightly harder press on the pedal, and later than you would normally brake helps avoid this from happening. When I put on new pads, I cleaned the crap out of the inside of the calipers, removing all the crap inside, including leftover grease - I feel this contributed to these pads sounding the way they do, so I will be applying some brake grease behind my pads this Friday to see if this will help.
My '22 GT4 does something similar. I suspect it could be down to minor braking-induced vibration making it through to the chassis in areas where the connection doesn't have a squishy rubber bushing to provide isolation like you would have in a non-GT suspended 718. I'm at roughly 7k miles and it has made the same sound since new so I always attributed it to part of the "character" of the car. Curious to see if anyone has a more definitive explanation though.
I didnt take notice of this at first glance, but the OP first and second images have a variant between the two hubs. The first image has scuffing on the outer lip of the hub, which may indicate that the brake/caliper is making contact where is shouldn't, thus causing the rumbling chatter that he's hearing/feeling
To be clear, the sound I'm talking about isn't a "squeal" or "squeak" - OP description as a pitch-shifting rumble is spot-on with what I'm hearing on my car. My perception is that it's coming predominantly, if not 100%, from the rear brakes.
@BoxKing If the caliper were dragging on the rotor hat it would make the noise all the time as the calipers are fixed, but interesting observation nevertheless.
@Simon737 Do you have any aftermarket parts that you know of in the rear suspension? I'm running TPC offset toe links which have no rubber isolation in the inboard bush, so I'd expect I'm getting some level of additional NVH coming through from the rear wheels.
To be clear, the sound I'm talking about isn't a "squeal" or "squeak" - OP description as a pitch-shifting rumble is spot-on with what I'm hearing on my car. My perception is that it's coming predominantly, if not 100%, from the rear brakes.
I think this is normal from new dimpled rotors and Copper-free pads. Does improve with time (or trackday or aftermarket pads). Probably coming from all 4 wheels... Not an indication of a mechanical braking problem.
Thanks for all the replies, I cleaned the car today and noticed a lot of pad residue on the alloy, cleaned it off eventually but it was tough to do. Again, normal?? Will it lessen as the pads bed in? It was the same
on both fronts with a little less on the rears.
05-14-2024, 10:12 AM
Noisy Brakes (Steel)
