Have a really weird braking issue on my s3 8p need help please

[Nenny98]

Hi everyone,
Right been scratching my head for a little while, so I have a rumble whilst braking but 100% clarified it's not my brakes and disks as I had them all changed, bedded them in was a little better but I still get the shake/rumble whilst braking at high speeds mainly it's weird only happens if I thrash the car but in normal driving it's fine upto 30 to 50 mph, not sure what it is as every garage I have took it too say the car is fine as they dont take it over 40mph and also all the bushes and track rod ends are fine what could this be?
Dodgy caliper maybe?
Buckled wheels?
Dodge abs?
Nothing comes up on the diagnostic
Car drives mint only braking issue but over time I've gathered how to stop lol
Like it's hard to explain like if I kind of pump the brake it brakes better

 

[prt57]

The fact you have to pump the brakes to give maximum braking efficiency indicates there may be air in the hydraulic system and so that needs bleeding out properly with a pressure bleeder.
Regarding the judder, this is tricky to diagnose without being in the car but you said it happens if you thrash the car. When this is occurring, the brake discs and pads material get very hot. This can lead to disc distortion and/or debris from the pads bing left on the disc, both causing judder. We had this on a TTS after fitting cheap Pagid discs and pads from ECP. Fixed by using better quality components. Also, when installing the discs, the hubs need to be spotless as any raised sections due to rust etc will cause the discs not to sit totally flush which will amplify the situation.
You need to take the car to a reputable VAG specialist and demonstrate it properly.

 

[Garrett 69]

It may be worth checking suspension mounts, track rod ends and wishbone dampers. I had a similar issue with my Arbarth which turned out to be disintegrated dampers.

 

[Nenny98]

Hi thanks for your replies, prt57 the only reason I pump the brake pedal is because I feel the judder in the wheel/steering if that makes sense, kind of gets rid of the judder dont exactly keep pumping it just kind of let go and press it again but something is weird guess I need take it to another garage