How long should original brake discs last?

[longuito]

As you can see, I'm trying to make up for a long absence from the forums, hehe...

I'm starting to notice an indentation on my rear disc, and was wondering as to the REAL durability of the discs, and some good possible replacements. With 50,000 km on the clock, I imagine this is nothing critical, but just wanted to get some opinions. Thanks again!

Luigi

[Huib Holland]

Just measure the thickness....

[YEN_POWELL]

I have found that fronts warp within about 50k miles but don't seem to wear too much. Rear starts to interest the MOT bloke at about 90k miles but I did manage about 110k miles before he cried enough and I replaced it with an EBC.

The EBC rear disc was okay (about 50 or 60 quid), the EBC fronts I found to be rubbish, only acting like decoration when trying to stop in the wet, especially with their recommended brake pads. I prefer the warping to the EBC fronts on my current bike (90k), it's more predictable.

[Lord Stig]

I thought my front (offside) was warped and was preparing to bite the bullet and change them - at 95,000 they also look fairly thin. However, around a month or two ago I discovered a part worn set of Nissin pads I'd forgotten about and fit them - the rubbing just disapeared and hasn't been back since!

The rear is quite thin now - as Yen says, it will probably raise eyebrows when it goes for its MOT in December.

[GSPD750]

See post #2...measure. Quite simple. Manual gives you service limits for disc thickness and disc maximum runout....or just physically check your disc as the min. thickness is stamped right on it. Too easy. How long they last I suppose is all relative to your type of driving and enviroment.

Following guide is for cars...but the same principle.
http://www.fordscorpio.co.uk/manual/brake/BrakeDisk.pdf

How's the weather in Quito? Yeah, I know...Hi 22 c low 8c...every..every day of the year

[longuito]

Thanks to all for the kind replies! When I have any news I will report back. Cheers and a great weekend to all!