Help! MOT failure due to bent disc.

Copper · Post by **Copper** » Fri Dec 13, 2013 5:52 pm

Corvus wrote:
Your disc set up is not like his though. It is radically different.

Yes, his has a carrier but the principal is the same.

Jon

Corvus · Post by **Corvus** » Fri Dec 13, 2013 6:01 pm

Copper wrote:
Corvus wrote:
Your disc set up is not like his though. It is radically different.
Yes, his has a carrier but the principal is the same.

Jon

There are some significant differences. What are you going to lever against? You're a brave man!

Copper · Post by **Copper** » Fri Dec 13, 2013 6:20 pm

I'm going to use an adjustable spanner on the disc

Corvus · Post by **Corvus** » Fri Dec 13, 2013 6:27 pm

Copper wrote:I'm going to use an adjustable spanner on the disc

So, in effect, you're levering against the turrets?

Herb · Post by **Herb** » Fri Dec 13, 2013 7:02 pm

Apologies in advance for sounding rude.

These are your brakes!!! Subject to thermal cycles and high load. The professionals can't straighten them, but a bloke on the web says you can do it with a magic marker and a crowbar?

I would think again. It may be a case of sucking it up and forking out.

I would also call your dealer and see if they will give you a discounted price, given the known problems with discs on this model. You never know?

slparry · Post by **slparry** » Fri Dec 13, 2013 7:37 pm

Your discs are the same fitted to

http://www.realoem.com/bmw/partxref.do?part=34117713156

one of which in the list is the F800S

Searching for F800S disks on ebay brings up

http://www.ebay.co.uk/sch/i.html?_odkw= ... c&_sacat=0

and for the F800ST
http://www.ebay.co.uk/sch/i.html?_odkw= ... c&_sacat=0

Sherlocks have some used ones that they guarantee are straight. One for 39 and the other 49 quid

herrman · Post by **herrman** » Fri Dec 13, 2013 7:43 pm

Hi,
PITA to buy a new Disc or Discs I know but these are your brakes we are talking about!! Trying to straighten with an adjustable and brute force

My 12s was given an advisory for a warped rear disc last MOT but I wont be trying to force it back into true. End of the day they are your brakes but I might just have to share the road with you.

Peter.

Copper · Post by **Copper** » Fri Dec 13, 2013 7:46 pm

Hi,

Thanks, they aren't the same mine are the later type that have the fixed washers.

I'll be gently bending metal back a few thousanths of an inch. I'd imagine that the same metal is exposed to much greater forces during braking.

I'll let you know if it works or not.

Jon

Copper · Post by **Copper** » Fri Dec 13, 2013 7:52 pm

It can be done.

See here,

http://www.motoliner.com/motorcycle-bra ... tening.php

And here

http://www.stmotorcycles.co.uk/index.php?p=1_4_About

Copper · Post by **Copper** » Fri Dec 13, 2013 7:52 pm

It can be done.

See here,

http://www.motoliner.com/motorcycle-bra ... tening.php

And here

http://www.stmotorcycles.co.uk/index.php?p=1_4_About

slparry · Post by **slparry** » Fri Dec 13, 2013 7:57 pm

I'm guessing they'll skim them maybe, which has been available on cars for years.

If it were me I'd just get new ones give a new pair of Brembos are £198 and, to me, there's two things that you don't mess with on a big bike. The tyres and the brakes with suspension nibbling at the definition too

Copper · Post by **Copper** » Fri Dec 13, 2013 8:04 pm

slparry wrote:I'm guessing they'll skim them maybe, which has been available on cars for years.

If it were me I'd just get new ones give a new pair of Brembos are £198 and, to me, there's two things that you don't mess with on a big bike. The tyres and the brakes with suspension nibbling at the definition too

Motoliner said they press them flat.

S T said he spins them in a jig and bends them back.

Where can I get a pair for £198 because I've been quoted that for one.

Jon

slparry · Post by **slparry** » Fri Dec 13, 2013 8:09 pm

Copper wrote:
slparry wrote:I'm guessing they'll skim them maybe, which has been available on cars for years.

If it were me I'd just get new ones give a new pair of Brembos are £198 and, to me, there's two things that you don't mess with on a big bike. The tyres and the brakes with suspension nibbling at the definition too
Motoliner said they press them flat.

S T said he spins them in a jig and bends them back.

Where can I get a pair for £198 because I've been quoted that for one.

Jon

Ebay have brembos for 98 each

However, even cheaper if you don't mind the wavy ones are these
http://www.ebay.co.uk/itm/One-Front-Arm ... 43bbbd4563

at £69 each and they have 10 in stock

.... and it says 06 to 11 for the year so should be a fit

slparry · Post by **slparry** » Fri Dec 13, 2013 8:16 pm

Compat chart here

http://bikeitdirect.co.uk/204

Copper · Post by **Copper** » Fri Dec 13, 2013 8:21 pm

slparry wrote:Compat chart here

http://bikeitdirect.co.uk/204

Hi,

Thanks appreciate that will probably get some if I can't sort it out myself.

I'll have to check the run out to ensure the disc is the problem and not the wheel, I'll see how far its out, I can't see a little "tweak" here an there can hurt!

Jon