I didn’t know that, and I’m surprised, although I did know about the new disc scam that many places were trying to pull. I think the only reason these worked at all was all the friction from the rust flakes!Can't fail them now for rust/corrosion - if they pass the load on the brake rollers it is pass (this has been relaxed too many fast fit garages selling too many discs and pads when testing cars).
They either work or they don't.
If they are really thin - they can fail - if they are missing bits they can fail.
Pass and advise...
I didn’t know that, and I’m surprised, although I did know about the new disc scam that many places were trying to pull. I think the only reason these worked at all was all the friction from the rust flakes!
NoAre missing disk stone guards a fail?
Good cos one of mine may rust off before next mot
not much diffrent to drilled disks just rust pits instead . as said if they pass on the rolling road brake test for eficiency thats all that counts as long as they havent worn thinI think these should have been replaced some time ago. Not sure how it passed an mot only a few months and a few hundred miles ago, some of the rust pits are at least a mm deep.View attachment 309468
It's strange how discs on brand new cars last years without going bad like yours, but the replacements don't . It must be the quality wanted by the new car makers is alot higher than aftermarket.These lasted 110000 miles before being changed outside face looked perfect.
View attachment 309512
If its hanging only just hanging on i would remove it just incase the tester says it's unsafe.Good cos one of mine may rust off before next mot
Forgot when i was looking at new discs for the vauxhall i noticed that TRW had 2 different part numbers for for the same discs one of which was listed as high carbon discs and it was the only after market maker listing them and as TRW seem to supply quite a number of suspension/ brake parts as O/E for vauxhall/opal then these make be to O/E spec.It's strange how discs on brand new cars last years without going bad like yours, but the replacements don't . It must be the quality wanted by the new car makers is alot higher than aftermarket.
Exactly this, I think original discs are worth skimming if possible, new discs seem to wear out quicker than the air freshener.It's strange how discs on brand new cars last years without going bad like yours, but the replacements don't . It must be the quality wanted by the new car makers is alot higher than aftermarket.
Most brake discs - original fitment or service replacement (OEM not aftermarket) have approximately 2mm of wear either side, typically, that's two sets of OEM pads per disc change. They are scaled that way to reduce fleet running costs on average mileage in the first three years as well as reducing weight for the same reason.It's strange how discs on brand new cars last years without going bad like yours, but the replacements don't . It must be the quality wanted by the new car makers is alot higher than aftermarket.
Aftermarket pads are usually high in brass and have a coarser friction material, because it's cheaper that way. The downside is accelerated brake disc wear. Good luck with skimming brake discs and staying above the minimum reuse thickness, it's not unknown for insurance to be invalidated for brake discs below min. thickness in the event of a claim. Reuse thickness is generally 0.7mm above discard (minimum) thickness although this varies by car manufacturer, brake pad minimum thickness is usually 1.5mm, some are 1.0mm - again, car manufacturer dependent.Exactly this, I think original discs are worth skimming if possible, new discs seem to wear out quicker than the air freshener.