What is the difference between OEM and other Brake Discs?

[MinhDinh]

My friend has a Yamaha YZF R125, and his back disc is apparently worn according to the garage and the pads went to the metal.

Anyway the back OEM disc brake is 170 quid, and he has looked at ebay and found some for 30 quid, and even 50.

I believe the metal wears out faster perhaps, but any other ideas?

I have seen EBC brake dics on weemoto for 70 quid, which is a better company I assume.

He asked me to ask on here. Thanks.
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[Bezzer]

OEM parts are always dearer than aftermarket, and not necessarily better quality. There are some iffy replacement discs out there from China and suchlike, stick with known brands like EBC and you'll get as good if not better quality than OEM at a cheaper price.
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I used to be indecisive but now I'm not quite so sure.

[sickpup]

[yen_powell]

I replaced the original front discs on my Africa Twin with EBC when the originals warped after 70k. The new discs suffered with extreme wet weather lag despite using the pads recommended by EBC and they rusted heavily after rain. I ended up using motocross brake pads to make them work in heavy rain.

On the other hand, the rear disc I replaced with an EBC (my old disc had done 120,000 miles and was a bit too thin to pass an MOT) worked really well and never rusted at all.
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[unitynotsocri...]

i've found oem parts are better in most cases but then again many manufacturers are lowering the quality making stuff in the same factories and charging the customer.When parts get expensive cgeck out a local engineers,they can skim discs if they are not too warped(don't mention that word?).
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[Bezzer]

[Kickstart]

Hi

OEM stuff is normally a reasonable quality (early 1990s Yamaha floating disks apart).

Aftermarket ones are far more variable. Some really cheap and nasty stuff, some good stuff at a reasonable price and some very good stuff at prices that would make you cry.

I bought some Zone Products disks a few months back for the ZZR600. They seem to be working fine, although to be fair they do get a pretty easy life.

All the best

Keith
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[Vincent]

If your mate ends up buying a used disc off eBay, get him to ask the seller exactly how thick it is and make sure it's within the tollerances, (usualy stamped on the original disc - "4mm" etc), also, make sure it's not warped either. I'd stick with a Yamaha one, as mentioned above, the Quality of some EBC discs, leaves a lot to be desired and some of the "wavey" discs are utter shite. There should be plenty of good used discs out there. Some makers recommend renewing the disc bolts too, the old ones may be stuck in using loctite. In which case, just heat them up before undoing to release them. Make sure the surface of the wheel is completely clean before sticking the new disc on and torque down the bolts, (use the propper ones). Oh, and tell him to keep an eye on the condition of his pads in future and not to let them wear down the the steel
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