MOT - warped brake discs

[Wideboy]

last MOT i had 1 advisory for warped front discs and under reasonable braking i had a slight pulse effect from the front brakes as they are warped, MOT due next month so i gave my discs to my brother to skim. I told him that as soon as they got to 4mm he should stop and if they are still warped then I'll get some new ones.

anyway gave them to him and he did them yesterday, one disc was 4.5 and other was 4.7- something, he put them in a jig and did the sums or what ever, found out one was worse than the other and said there's no point because to get them true he would have to go bellow 4mm so i said leave it.

put them back on this morning as a temp until i get new ones, just did the customary "up and down the road to check everything is gravy" and the pulsing has stopped and the brakes are brilliant, i didn't label what side the discs came off so they could be round the other way than i had them

question is how do they check for them being warped for the MOT because if it will get through again i sure as hell am not bothering paying for new discs

tar

Sounds like he's managed to strighten them but they will now be below the 4mm min thickness won't they?
I'm guessing this guide line is for heat etc as when they get thinner they will heat up more under breaking?
TBH not sure what they say on MOT's regarding discs

[Wideboy]

no he didn't skim them, unless having them in the jig managed to flatten them

i took them off last Thursday and had them laid on a flat surface until monday evening but i cant see how they could straighten themselves out

[Biker Biggles]

MOT will test if they work with no obvious faults.It appears they now do?

Its your brakes. If you're happy they will work fine. Personally I'd bin them and get a new pair.

Money != Life

could have been a rusted up floating pivot that the jig managed to free up?

Had this happen on my 6-pot mountain bike calipers that have floating discs!

Your fecking about with brakes boy. Stop being a tight wadd!

[Wideboy]

a slightly warped disc is hardly going to kill me most is going to do is cause my pads to wear un-evenly

i thought they had some sort of way of checking them for trueness

Originally Posted by Wideboy

a slightly warped disc is hardly going to kill me most is going to do is cause my pads to wear un-evenly

i thought they had some sort of way of checking them for trueness

Are they not likely to fail the MOT this time?

[Wideboy]

well i duno, it was just an advisory last year and the MOT bloke said not to bother with it until next MOT

its not major pulsing on the brakes, just a slight one