BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Rear brake pedal change Empty Rear brake pedal change Sat Jan 19, 2013 10:57 am

MT350Explorer

MT350Explorer
Life time member
Life time member
Hi Guys,

Isn't corrosion weird? Check out the underneath of my rear brake pedal; it's quite far gone. I think others have had this problem - was it Sidecar Paul mentioned he's changed one or two? Is it a problem only for us western Europeans or does it also go bad in hot climates like Aus?

Anyway, changed it out for a good one. Very Happy

Cheers
Dave
Rear brake pedal change Pedal10


__________________________________________________
1991 K100 RS 16 valve
    

2Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 11:21 am

JGT

JGT
Gold member
Gold member
I had the same thing happen to the rear brake arm (drum brake) on my R80. The aluminium seemed to de - laminate. I'm not sure whether they are sand cast or die cast but a very odd form of failure. John

    

3Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 11:49 am

MT350Explorer

MT350Explorer
Life time member
Life time member
k100virgin wrote:I had the same thing happen to the rear brake arm (drum brake) on my R80. The aluminium seemed to de - laminate. I'm not sure whether they are sand cast or die cast but a very odd form of failure. John

Yeah odd isn't it John? I didn't think of aluminium being a laminated kinda structure- if you know what I mean! Very Happy

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

4Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 12:06 pm

charlie99

charlie99
VIP
VIP
wow dave that is weird ....todate havent seen the same

could it be because of road salts ? \

something i dont think we experience at all out here .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%ORear brake pedal change Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

5Back to top Go down   Rear brake pedal change Empty ? Sat Jan 19, 2013 12:20 pm

88

88
Life time member
Life time member
I've never seen anything like it Dave, I wonder if we have any metallurgists on the forum? Did it fall out in one lump or flake away?
88


__________________________________________________
Rear brake pedal change Ir-log11 88....May contain nuts!Rear brake pedal change Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1100LT 1992 - AKA Big Red
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K1/RS - AKA Titan (unique hybrid by Andreas Esterhammer)
    

6Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 12:58 pm

Avenger GT

Avenger GT
Life time member
Life time member
Mine is the same, but not as quite as bad. I suspect it is from salt.

    

7Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 1:47 pm

japuentes

japuentes
Life time member
Life time member
Mine is spotless, even has logo and part number.
Guess you are right with the salt.
Best regards
JAP


__________________________________________________
Rear brake pedal change 2854237993 1988 K100RS SE/ABS
    

8Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 2:26 pm

MT350Explorer

MT350Explorer
Life time member
Life time member
Hey Guys, yeah I reckon it must be the salt and the wet. My bike spent much of its life as far south in Engalnd as you can get and I assumed did not get a lot of road salt on it as it is relatively mild there (by UK standards). Maybe it was being in a coastal location - sea salt.

Do they use road salt in Ireland 88? EDIT - ah yes I see you do!

It seems it has flaked away gradually and of course looking at it you'd think it was perect until you looked underneath. Usually a healthy supply of these pedals on Ebay so probably common.

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

9Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 3:24 pm

Guest

avatar
Guest
It is called exfoliation corrosion and is known in the aircraft industry.

    

10Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 4:11 pm

Avenger GT

Avenger GT
Life time member
Life time member
Mine is a UK bike originally, spent the first half of its life there. Our winters here towards the western part of Ireland are usually milder, but in the last few years the county councils have tended to spread salt on main roads at the merest hint of frost. I usually try to avoid using the bike when the roads are salted, but this winter I have had no choice due to being "between cars" for a while.

    

11Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 4:25 pm

MT350Explorer

MT350Explorer
Life time member
Life time member
Exfoliation corrosion - well you live and learn, thanks. Well I reckon I will put a couple of coats of paint underneath the pedal on the 'replacement'.
Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

12Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 4:38 pm

sidecar paul

sidecar paul
Life time member
Life time member
Yes, Dave, I have had that on my rear brake levers and if it doesn't occur in Australia, then it probably is caused by our salted roads. On one early lever I kept slimming down the foot piece to tidy up the corrosion, until it was only about 1/2" wide........looked quite racy!

One strange thing, though, is that other alloy parts don't suffer like the brake lever; for instance, I've never replaced a gear lever. scratch

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

13Back to top Go down   Rear brake pedal change Empty Rear brake pedal change Sat Jan 19, 2013 5:02 pm

RT

RT
Life time member
Life time member
Gee guys, I'm starting to think that Japuente has it made . We all should move to Venezuela.
RT


__________________________________________________
2011 R1200RT
    

14Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 7:57 pm

Guest

avatar
Guest
Exfoliation corrosion will not affect all alloy parts at the same speed, as there are many types of alloy. It will have the most effect on alloys with more grain. These parts would normally have some sort of varnish or paint to protect them, but if that protective surface is punctured in any way then that is how it will start. Salted wet roads will make it worse.

    

15Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sat Jan 19, 2013 8:18 pm

RicK G

RicK G
admin
admin
It's not quite the same but reminds me of crevice corrosion you get in high grade stainless in a marine enviroment. Rudder shafts are very susceptible to it because of welding. The crevice corrosion comes from the metals not alloying properly at manfacture of the shaft or welding and as a result you get dissimilar metals within the one piece of metal and the salt is an electrolite.
Big difference is that a microscope is usually needed to get that lamination look. Painting may not solve the problem if it is the same as crevice corrosion then a protective coating makes it happen quicker because it holds the electrolite in there in a closed enviroment. I have never seen that in aluminium and I wont go so far as to say it is the same but it does bear remarkably similar characteristics.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

16Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 4:10 am

klompy the grey brick

klompy the grey brick
VIP
VIP
exfoliation does occur in aviation a lot and mostly in alloys that are down the galvanic series list approaching those considered
"sacrificial anodes " such as zinc....so things like magnesium exfoliate real quick especially if attached to another alloy such as steel...without a substance ion between to break the flow of electrons....and subsequent removal of material from one to another

Rear brake pedal change Corros10


__________________________________________________
KKlompy Rear brake pedal change 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Rear brake pedal change Au-log10


    

17Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 4:30 am

RicK G

RicK G
admin
admin
The strange thing is that there is no other metal anywhere near it.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

18Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 4:39 am

klompy the grey brick

klompy the grey brick
VIP
VIP
perhaps its like a layer cake of dissimiilar metals....like pages of a book.....mine is fine...no electrolytes there...


__________________________________________________
KKlompy Rear brake pedal change 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Rear brake pedal change Au-log10


    

19Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 6:56 am

Guest

avatar
Guest
@Rick G wrote:The strange thing is that there is no other metal anywhere near it.

Nor would there need to be. Dissimilar metal corrosion is caused by electrolytic action on the surfaces of two metals, but if you think about it, alloy is a fusion of different metals and if it has a large grain as in a casting, then there is the potential of exfoliation caused by electrolysis.

A great preventative is WD40, we used this in the RAF to protect the undercarriage bays on some aircraft, but it is short term 6 to 12 months.

    

20Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 7:26 am

klompy the grey brick

klompy the grey brick
VIP
VIP
As we did on various aircraft...3 types of water displacement corrossion preventative WDCP from light WD like rp7 wd40 boeshield etc through to a thick coating used to prevent further degradation particularly for long term preservation.

Found that for example B707 undercarriage doors made of magnesium (light and strong and magically flammable) was bolted to an alloyed main undercarriage with mild steel bolts....and you could almost see and hear it corrode....and don't even start me on Canberra's and vampires and other brit aircraft who wanted badly return to the raw materials they were made from....in OZ the BMW is very resilient but we do not salt...


__________________________________________________
KKlompy Rear brake pedal change 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Rear brake pedal change Au-log10


    

21Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 8:15 am

Guest

avatar
Guest
Vampires! I saw a picture of one of those :-) . I was more involved with Harriers, Jaguars, Tornados and VC10s.

    

22Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 8:28 am

klompy the grey brick

klompy the grey brick
VIP
VIP
I worked ADV during the gulf war (Khamis Mushayt)...too new to corrode then......


__________________________________________________
KKlompy Rear brake pedal change 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Rear brake pedal change Au-log10


    

23Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Sun Jan 20, 2013 9:30 am

RicK G

RicK G
admin
admin
bikerboy wrote:
@Rick G wrote:The strange thing is that there is no other metal anywhere near it.

Nor would there need to be. Dissimilar metal corrosion is caused by electrolytic action on the surfaces of two metals, but if you think about it, alloy is a fusion of different metals and if it has a large grain as in a casting, then there is the potential of exfoliation caused by electrolysis.

A great preventative is WD40, we used this in the RAF to protect the undercarriage bays on some aircraft, but it is short term 6 to 12 months.
Thats what I was getting at with the high grade stainless. The uneven mix of metals in the alloying process effectivly gives dissimilar metals.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

24Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Thu Feb 21, 2013 5:22 pm

sidecar paul

sidecar paul
Life time member
Life time member
Found my old brake levers today, down in the garden shed.

Rear brake pedal change Sam_0515

Rear brake pedal change Sam_0516

They've just continued to corrode away since I replaced them donkeys' years ago.
Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

25Back to top Go down   Rear brake pedal change Empty Rear brake pedal change Thu Feb 21, 2013 5:35 pm

RT

RT
Life time member
Life time member
Wow you should call the British Natural History museum, I think that is the Bog Man's
motorbike controls. What a find.
You don't live on the Moors do You?
RT


__________________________________________________
2011 R1200RT
    

26Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Thu Feb 21, 2013 6:11 pm

sidecar paul

sidecar paul
Life time member
Life time member
No moors, RT, just our winter salted roads.
Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

27Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Thu Feb 21, 2013 10:10 pm

krambo

krambo
Life time member
Life time member
My 1984 K100RT rear brake lever did exactly the same so I bought a good/cheap genuine replacement - that was two years ago and it is still sitting in the spares cupboard - one day I will get around to changing it Wink


__________________________________________________
1984 BMW K100RT, 1993 BMW K1100LTIC,1982 Kawasaki KZ1100 Spectre
"Aut viam inveniam aut faciam." Rear brake pedal change Uk-bmw12
http://www.its-personal.net
    

28Back to top Go down   Rear brake pedal change Empty Re: Rear brake pedal change Fri Feb 22, 2013 1:57 am

MT350Explorer

MT350Explorer
Life time member
Life time member
Wow Paul I hadn't seen the photos, theya re pretty far gone!
Go for it Krambo! Best tenner I ever spent LOL
Dave


__________________________________________________
1991 K100 RS 16 valve
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum