Warped rear discs?

[knoxville]

I've got a terrible rumbling from the rear discs after some Spa/Ring action. Just a light application of the pedal gives the rumble which I can feel through the car but no steering wheel shake which suggests rear issue and even when fully on it the rumble was still there...

AP discs all round and RS29s with upgraded lines and fluid.

Possible known problem with the AP rear discs? They were fairly blue on the trip but have cleaned up fine with sensible driving but still the issue remains.

Any suggestions?

[Jon8710]

funny for the fronts to go,

could it be deposits on the discs ? i know mine rumble for a few days after a TD.

[Rick H]

Mine were awful at the end of my Oulton day, thought I'd ruined them but smooth as Pamela Anderson's chuff by the time i got home.

[knoxville]

funny for the fronts to go,

could it be deposits on the discs ? i know mine rumble for a few days after a TD.

Fronts are fine. I was hoping it was deposits, but I usually get that after not being hard on the brakes and then they'll clean up after a good pasting. Not this time. Got progressively worse as the laps went on. Might check the run out then chuck my spare pads in to see what happens.

[shimmy]

Will be deposits, never heard of rears warping. pads don't always clear it up, as deposits can collect more deposits.

Sometimes better to use different compound discs, use sandpaper or get them skimmed.