Main cause of this vibration is not warped discs, but discs with uneven thickness. They are cast iron, develop hard and soft spots with use.
.001" thickness variation is too much, you will feel it in the pedal.
Get them machined on a drum/disc lathe by a reputable brake repair place.
Min thickness limit for machining on S discs is 8.0 or 8.5mm........

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

i had a look through my manual, but i can't find the machining tolerance for the discs, anyon know?

BTW, a repco machine shop charged me 11 dollars per disc if I pushed them accross the counter as opposed to them pulling them off. Then the price went up to 50 dollars per disc.

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

If looking for thickness tolerance, it's not in there...
I always measure new ones, if more than .0002" (2/10s of a thou)variation I take em back...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hello, just a thought on the vibration bit:

1) check that the disc is bolted on correctly and true. You can easily have a warped flange or bolt the flange on not quite true, giving you a rotor that is not 90 degrees to the axle. It also throws off your hub nut torque.

Check: get a dial gauge and magenetic block, set it up so that dial gauge is right angles to the rotor surface, spin the rotor and there should be 0 movement side to side.

Remedy: Pull it all apart, check the disc for warping, check the flanges for warping or burrs, machine both if necessary. When bolting on the and flange, use the wheel nuts and some hardenned washers to pull the flange down flat at full torque, before doing up the hub nut. Check again with dial guage.

2) What type of pads are you running? some bad/el cheapo pads and do all sorts of wierd and wonderful things.

Check: For pad glazing and uneven wear

Remedy: EBC Black Stuff pads or similar carbon kevlar pads.

Hope that helps

_________________
Lillee - 1969 Morris Mini K