Rear discs on S2000

[Galvinator]

Hi,

Just purchased (and absolutely loving) my S2000!!! When I bought it , the rear discs were rusted around the outer edge. I thought with some spirited driving they'd clean up however the outer edge is still rusty. Having heard some people say that the rear pads are not big enough to come into contact with the whole disc, I wondered if anyone else had heard this.

Don't really want to replace discs and pads at the rear only for the same thing to happen again...

Cheers

[Hammer67]

1. Jack up
2. Remove wheels
3. Remove pads
4. Clean up discs with some abrasive material.
5. Deglaze pads with some abrasive material.
6. Reassemble with some copaslip.
7. Replace wheels.
8. Jack down.
9. Go for a drive to bed pads back in.
10. Rinse and repeat every time it reoccurs, which it will.


HTH

[Squating Neville]

S2000 have been doing this on rear discs since new, the only way to get rid of the rust on the edges, is get the discs skimmed by a lathe or replace them, if you can get a lathe that will fit in there,if not will have to put a rear disc on the front, skim it then put it back on the back. the pads will be grooved on the edges due to the rust sticking out further than the disc face, if you get them skimmed the same will happen again to the discs if you put in the old pads back in as they wont touch the disc face square, and if you try and rub them down flat you will never get them perfectly flat and this will cause rusting to happen also, depending how old the car is the rear calipers may be worth getting rebuilt.

[Galvinator]

Thanks.

Does leaving the discs like this significantly reduce the effectiveness of the rear brakes?

I'm a complete idiot when it comes to mechanics so not sure I'm competent enought to start stripping and cleaning... Anyone know how much a decent mechanic would charge to do this?

[Kozy]

If it's rusty then it's not being used. Other than looking a bit naff it's not going to affect anything.

[Grovsie26]

Wire brush?

[Packman]

I have this problem on mine but I fitted Bremsport Discs and Pads the last time I changed them so I suspect that you to have aftermarket pads on the rear.

If you change them for OEM I think that this problem disapears. Beware when you re-fit the pads, (OEM or Aftermarket), there is a locating pin on the back of one of the pads that has to be located in crusiform depression in the brake caliper piston crown. If its not the pad will not be square to the disc and it will wear the pad and the disc very quickly.

[NateWM]

Just a common "problem" on many Hondas of that era, including my Accord!

It causes no issues apart from looking a bit naff. You could always do what I done and spray the rusty edge with some HT black paint. You could also give the arches a good clean and spray parts while your thete!

[Galvinator]

Thanks Packman!

So with the Bremsport kit, do you find that the pad is in contact with the entire disc and therefore stops this from happening. My local Honda dealer reckons that replacing the rear Discs and Pads is a false economy, because the same thing will happen again!! Is the Bremsport kit more expensive? I have been quted £275 supplied and fitted from Handa.

[Packman]

Galvinator,

If you want Bremsport components go to Brakes International, (Sorry but I don't know how to add the website link here). Just do a Google Search and you will find them.

I wanted Bremsports because of the drilled and slotted aspect of the discs, however, if you track your car, OEM components would be a better bet as drilled and slotted discs will crack more easily if overheated.

The location peg is a common aspect. (OEM or aftermarket pads). It is there on all S2000 rear brake pads. Just be careful when assembling. etc

[Riknos]

This

Kozy said:

If it's rusty then it's not being used. Other than looking a bit naff it's not going to affect anything.

I'm glad I'm not the only one who read this as - If the pads aren't touching that part of the disc, then it doesn't matter if it's rusty/clean/not even there as it's not being used? Or is this purely an aesthetics thing?

[Kozy]

Pretty much, it's just a part of the disc that the pad isn't in contact with, a lot of Honda rear discs have the outside edge of the pad inboard of the edge of the disc, changing the discs alone isn't going to change that.

[Galvinator]

I was at an auction today with work and saw a 53 plate S2000 waiting to go through another sale. Out of interest I looked at the rear discs as it had clearly just been washed off and so the discs had some surfice rust on them. When it was moved into line I looked at the dics again, and the rears have been "cleaned" of all surfice rust right to the edge after being moved a small distance and stopped from a low speed. The discs were OEM (they had Honda written around the hub), nit sure what the pads were, but this example clearly demonstrates that the whole pad was in contact with ALL of the disc.... Anyone got any ideas? Does it all come back to the re-assembly of the brakes after work and the locating pin that was mentioned early???

Someone please tell me - I'm ultra anal about my cars and can't stand imperfections. I can't beleive that Honda manufacture a sports car whose rear brakes are effectively only 50% effective compared to the size of disc etc..??? HELP!!!!!!

[Squating Neville]

Galvinator said:

I was at an auction today with work and saw a 53 plate S2000 waiting to go through another sale. Out of interest I looked at the rear discs as it had clearly just been washed off and so the discs had some surfice rust on them. When it was moved into line I looked at the dics again, and the rears have been "cleaned" of all surfice rust right to the edge after being moved a small distance and stopped from a low speed. The discs were OEM (they had Honda written around the hub), nit sure what the pads were, but this example clearly demonstrates that the whole pad was in contact with ALL of the disc.... Anyone got any ideas? Does it all come back to the re-assembly of the brakes after work and the locating pin that was mentioned early???

Someone please tell me - I'm ultra anal about my cars and can't stand imperfections. I can't beleive that Honda manufacture a sports car whose rear brakes are effectively only 50% effective compared to the size of disc etc..??? HELP!!!!!!

Its a characteristics of the car, the braking balance is alot less at the rear, thats why they rust, its a street car the salt on the roads does not help either, they all do it after time. either live with it or replace the discs and pads when it starts to form if its that much of a problem. Maybe by ceramic discs

[Kozy]

I'm fairly sure the outer edge of the rear discs on my ATR are corroded, just assumed that was normal.

[elementad]

It IS a trait of the car. In fact if you get new discs and it rains when you park up, if you don't use it again until the following weekend they'll be covered in rust again. It'll be gone again when you've been for a drive.

By the way discs for S2000 were good price from Brakes International. Pads from Honda.