Warped discs or not ???

[mickyh7]

Had my Discs and pads replaced about 1500 miles ago because they felt warped.
Huge pulsing under hard braking at speed. Now I've more than bedded the new discs in, the pulsing is back. Only when the discs are hot though?
Lovely and smooth when I first get in.
I'm baffled. Can anyone shed any light on this?
I read dont brake hard then leave the brake pedal pressed, but its an automatic, I leave it on Brake Assist.
I've tried multiple emergency stops it didn't work.
Anyone please ?
Thanks

 

[BD55SOL]

What model A7? Amd what disc type do you have?

BD55 SOL

 

[mickyh7]

S line 2014 19" wheels, just standard replacement discs.
No grooves or holes.

 

[mickyh7]

All sorted out on the A6 forum as its a lot busier.
New Brembo discs were faulty. Massive run out when gauged.
Replacement Mintex discs and pads
At only £133- Have totally changed the car.
Thank Goodness!

 

[andy43]

For a quality part that's very disappointing. Glad it was sorted.
(crosses Brembo off approved parts list...)

 

[mickyh7]

For a quality part that's very disappointing. Glad it was sorted.
(crosses Brembo off approved parts list...)

Bearing in mind my Mechanic told me he had clocked these and they were perfectly within spec earlier, which threw my thinking.
Needless to say I'm looking for a new local Garage . The whole story is on the A6 forum, but I'm pretty sure they were not new discs they fitted, but a returned warped set. I'll never know ?

 

[mickyh7]

After a few thousand miles I'm back whete I started.
Over 70mph braking causes massive vibration. Coming to a slow stop feels sticky?
Three sets of discs in 8k can't be right ?
Tried Brembo, Mintex and Padget Discs and Pads. All seem well for aprox 2k miles.
I'm on standard single pot Calipers.
Any ideas anyone?

 

[mickyh7]

After reading lots of advice.
Six very high speed emergency stops have fixed it.
It really does feel like I have new discs on.
Really bad smell afterwards and severe brake fade for a while.
And I've been advised to stop using the automatic brake feature which holds the car at lights etc. with brake pressure as its allowing pad transfer.

 

[Corb2000]

Thanks for flagging this up. I’ll reduce my use of the auto hold too.


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