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Old 12-09-2011, 10:04 AM   #1
Mane OP
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Question Front brake disc on R100GS is bent. Looking for options...

Hi,

It turns out that my front brake disc is bent and the OEM replacement is $470.00 at MAX BMW. I've decided to look up for alternatives on aftermarket and might even consider this as an opportunity to upgrade the well know weak front brake performance on airheads (if it does not get too spendy...)

Someone at this site recommend me to look at EBC rotors and I've been having trouble to find an online source with a working website to find parts and prices. Does anybody knows the EBC part number for a R100GS brake rotor?

What about another vendor? is the EBC the best or only option for our old airhead GS?

If there a kit for improve braking performer I should look up instead (Garrison o Garrent, don't remember)?

Thanks for you help!

Regards
Mane
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'06 KTM 640 Adventure (Sold it and regret it since day one)
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Old 12-09-2011, 10:20 AM   #2
One Less Harley
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Ted Porter EBC $219.00, the rotor carrier is bare AL I painted mine black.



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Old 12-09-2011, 10:55 AM   #3
disston
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Quote:
Originally Posted by Mane View Post
Hi,
might even consider this as an opportunity to upgrade the well know weak front brake performance on airheads (if it does not get too spendy...)
I think you have Brembo brakes on that bike. It's the earlier ones with Ates that cause all the grief. Although your Brembos will also see some improvement with the semi-floating EBC rotors.

Charlie
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Old 12-09-2011, 11:36 AM   #4
Crisis management
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Motobins or Motorworks out of England?

How bent is it, I have straightened a few discs with a copper faced hammer and a something solid to rest it on, sometimes successfully, sometimes not.... But, if it's bent now, how can you make it any worse?

Find the high or low points on the disc and mark with something (permanent marker?) remove from wheel, rest over an open vice and hit the high point with a sharp and decisive blow, tapping won't do it. Repeat until straight.

Seriously, this can work and a couple of hours work may save you some serious $.
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Old 12-09-2011, 12:16 PM   #5
Rob Farmer
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Motobins will tell you they don't do an EBC replacement for the 100GS but you can get a floating EBC that fits straight in. Drop Arkwright2007 a line. He bought one for his bike.
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Old 12-09-2011, 06:08 PM   #6
Mane OP
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Quote:
Originally Posted by One Less Harley View Post
Ted Porter EBC $219.00, the rotor carrier is bare AL I painted mine black.



Hey, thanks for the heads up!

Regards,
Mane
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'94 BMW R100GS Bumble Bee
'08 Triumph Tiger 1050 (Sold it, solid performer)
'06 KTM 640 Adventure (Sold it and regret it since day one)
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Old 12-09-2011, 06:10 PM   #7
Mane OP
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Question

Quote:
Originally Posted by disston View Post
I think you have Brembo brakes on that bike. It's the earlier ones with Ates that cause all the grief. Although your Brembos will also see some improvement with the semi-floating EBC rotors.

Charlie
Charlie,

Could you please explain these a little bit more? Are you saying that early airhead GS (and G/S for that matter...) didn't always came with brembo brakes?

regards,
Mane
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'94 BMW R100GS Bumble Bee
'08 Triumph Tiger 1050 (Sold it, solid performer)
'06 KTM 640 Adventure (Sold it and regret it since day one)
'03 BMW R1150GS Adventure (Death because of hopistalary infection R.I.P.)
"Never wrestle with a pig. You both get all dirty, and the pig likes it".
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Old 12-09-2011, 06:55 PM   #8
SOLO LOBO
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Quote:
Originally Posted by Mane View Post
Charlie,

Could you please explain these a little bit more? Are you saying that early airhead GS (and G/S for that matter...) didn't always came with brembo brakes?

regards,
Mane
All the GS's and G/S's came with Brembo's

The German HE 320mm rotor that comes with the caliper spacer are really great, much better than stock
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Quote:
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your bike is suitably dirty. Well done.
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Old 12-09-2011, 07:20 PM   #9
Mane OP
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Quote:
Originally Posted by SOLO LOBO View Post
All the GS's and G/S's came with Brembo's

The German HE 320mm rotor that comes with the caliper spacer are really great, much better than stock
Solo,

Thank you for the confirmation,

Is there a local source for these German HE 320mm rotor and caliper spacer in the US?

Do you have any pics to share?

regards,
Mane
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'94 BMW R100GS Bumble Bee
'08 Triumph Tiger 1050 (Sold it, solid performer)
'06 KTM 640 Adventure (Sold it and regret it since day one)
'03 BMW R1150GS Adventure (Death because of hopistalary infection R.I.P.)
"Never wrestle with a pig. You both get all dirty, and the pig likes it".
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Old 12-09-2011, 07:32 PM   #10
disston
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Quote:
Originally Posted by Mane View Post
Charlie,

Could you please explain these a little bit more? Are you saying that early airhead GS (and G/S for that matter...) didn't always came with brembo brakes?

regards,
Mane
I didn't know that any Brembo's had problems. The comment that the OP made about "upgrade the well know weak front brake performance on airheads" made me think of Ates.

You're right I know nothing about GS or G/S.

Charlie
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Old 12-09-2011, 08:08 PM   #11
One Less Harley
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The G/S and GS have Brembos, not the 4 pot I have pictured though. The four pot is easy to get and put on. Conversion
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Old 12-09-2011, 08:36 PM   #12
Beemerboff
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Wemoto do a Kyoto OEM quality disk for the GS at a sensible price and they work well.

My GS had a 48 mm twin piston caliper which worked well enough, but if you must change make certain that you get one that you can get HH rated pads for - the PO of my G/S had gone down the four piston large disk route but it wasnt until I added EBC HH102 pads that it was any better than stock.

The correct M/C is essential - aim for a ratio of between 25 to 30 to one between the slave and the master cylinder if at all possible - Motorworks have 12 mm MC s to fit almost everything at a sensible price and they are the best bang for the buck you will get - and if you can bleed brakes any extra lever travel will be unnoticable.
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Old 06-09-2013, 12:45 AM   #13
Blady Hassel
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Hi,
i just got my Ferodo rotor as a replacement for my '93 R80GS original one. Mine is bent. I'm just not sure what the rignt way of installing is (there's no instruction inside), but seems to be easy.
the one i bought is:

.

.

.

.
with the old one

.
and finally should look like that

.
these are the mounting pieces

.

the curvy one is round shaped though it looks different from this angle

I'm just not 100% sure if that's the right way of mounting is but seems to be no other way to me (but never done that before and i'm a real newbe in mechanics:)

The rotor is a replacement for different models so i guess they give two screws to choose the right one. I think it should go like that .Please correct me if i'm wrong.

.
where the rotor disc is here


so mounting should look like that

.


and that cushioning (?) washer should probably be placed this way


not like the second photo i guess :)


Has anyone done that before. Am i right? Please correct me :)
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Old 06-10-2013, 07:00 AM   #14
darklight79
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Nice find what did the disk cost ? I wasnt aware that the disc would separate from stock carrier . Is you stock carrier staight ? Your bolt config looks right nice find where did you find this unit?
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Old 06-10-2013, 09:42 AM   #15
Blady Hassel
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Ferodo is pretty popular here for motorcycle brake pads. I didn't even know thay make rotors too until i asked :) in one of our motorcycle stores. Check http://www.ferodoracing.com/catalogu...s&code=FMD0081

i paid 500 polish zloty (pińcet złotych:) which is around US 155$. And had to wait around 3 weeks for it.

Blady Hassel screwed with this post 06-10-2013 at 09:47 AM
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