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1Back to top Go down   K1100 caliper pistons Empty K1100 caliper pistons on Sat Apr 21, 2018 8:56 pm

RicK G

RicK G
VIP
VIP
I am looking for a set or at least some of the hard anodized aluminium front brake caliper pistons to suit the 4 pot calipers from a K1100.
If I cant get some then I will have to make some stainless steel ones because I surely am not going to buy those crappy straight alloy pistons that are being sold as a kit.
Plan 2 does anybody know if the hard anodized pistons are still available and if so where. Pleeeeeeeeeeeeeeeeeeeeeeeeeeaaaaaaaaaaaaaaaaaaaasssssssssssssssseeeeeeeeeeeeeeeeeeee.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

2Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 9:39 pm

Dai

Dai
Life time member
Life time member
Motorworks BRA31631


https://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=40&Ct=IA&SbCt=BA_15_40_IA_30&spPage=3


I have one set (!!) in the garage and they look hard anodised to me.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

3Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 9:48 pm

Inge K.

Inge K.
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VIP
I think it's only anodized pistons available, as long they coming from BMW
or Brembo......and not Jack Black with a lathe.
Haven't seen anything else.......could be you find them on very early models...


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

4Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 9:54 pm

RicK G

RicK G
VIP
VIP
I thought they were all hard anodized but the ones I have just taken from the 97 K1100 I have here are just straight aluminium and very badly corroded and dont look like they have had any coating at all.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 9:57 pm

RicK G

RicK G
VIP
VIP
Maybe the ones I have are a cheap replacement type. They certainly are rubbish and not even fit for the scrap bin.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

6Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 9:59 pm

Inge K.

Inge K.
VIP
VIP
Possibly from Jack Black then........ K1100 caliper pistons 652573


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

7Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 10:06 pm

RicK G

RicK G
VIP
VIP
They have been professionally made and have the inserts that look like the pad material with a small hole. This is why I thought the newer ones were cheap alloy.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

8Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 10:13 pm

Inge K.

Inge K.
VIP
VIP
Sounds strange...


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

9Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sat Apr 21, 2018 11:03 pm

RicK G

RicK G
VIP
VIP
The bike they came from, a 1997 LT has been crashed and fixed very badly so it does not surprise me that other things have not been fixed properly.
The further I go with it the more surprises there are. Think I might just part it out.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

10Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 5:12 am

Pegasus

Pegasus
Silver member
Silver member
@RicK G wrote:I am looking for a set or at least some of the hard anodized aluminium front brake caliper pistons to suit the 4 pot calipers from a K1100.
If I cant get some then I will have to make some stainless steel ones because I surely am not going to buy those crappy straight alloy pistons that are being sold as a kit.
Plan 2 does anybody know if the hard anodized pistons are still available and if so where. Pleeeeeeeeeeeeeeeeeeeeeeeeeeaaaaaaaaaaaaaaaaaaaasssssssssssssssseeeeeeeeeeeeeeeeeeee.

Do you mean the black looking ones?
I've got an original set you can have.
I'll bring them with me when I ride down with Charlie.

cheers,

Andrew

    

11Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 7:58 am

RicK G

RicK G
VIP
VIP
They are black and glassy looking. The ones I found in this K1100 have a coating on them that has not reacted well with the watery old fluid. I am not sure what it is but it certainly doesn't last like the hard anodized ones.
Thanks Andrew much appreciated.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

12Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 12:34 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Forgive me if this is a thread hijack.

I am getting ready to go into the front calipers on my four valve K100RS because of sticking pistons.  In reading the description of the Motorworks rebuild kit it is mentioned that they strongly advise against splitting the calipers because of the danger of warping and subsequent leakage.  Can the seals and pistons be serviced without splitting the caliper body?


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

13Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 2:51 pm

jbt

jbt
Silver member
Silver member
No way.
But that suggests that you should better buy new calipers... Rolling Eyes
There's no problem about splitting them, it's a basic mecanic operation.
As long as you dont alter the contact surface, grinding it with a blade or hitting with a hammer, there's no risk.
Useful trick: before separating the hydraulic line, remove the pads and pump until the 4 pistons are almost out. Watch out that one is not getting out more than the others, if necessary, use pliers to prevent it.
Then separate and use pliers, or compressed air to remove completely the pistons. If so, be careful, sometimes they pop out strongly, use an old cloth to prevent rebound in your face.

    

14Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 5:34 pm

Dai

Dai
Life time member
Life time member
The recommended way is to pump out one side at a time; that implies some method of restraining the opposite side (a length of steel bar and a clamp does the job). What will happen is the pistons won't come the whole way out but they will get past the seals, which means you can pull them the rest of the way with your fingers.

If you do need to split them, the problem you're going to hit is that two of the bolts (the front and rear ones) are exposed inside the caliper and will almost certainly be as rusty as hell. That's going to prevent them from turning in the body. Scrape as much of the rust off as you can and get some penetrating fluid in there. Make sure that the allen keys are a good fit in the bolt heads because you're going to be putting a lot of pressure on them. A hot air gun will a great help - get the caliper good and hot. As each bolt comes loose, tighten it back up again. Not fully tight; you're just want them clamped down. Once all four are loose, wind them out evenly.

I've done three pairs of the four-piston calipers and split each pair in this way. So far I've not had a problem with leakage on reassembly.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

15Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 7:01 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Gentlemen, thank you for the useful information.   Having never been inside of a caliper before, I was approaching this job with a bit of trepidation, and the Motorworks comment didn't help.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

16Back to top Go down   K1100 caliper pistons Empty Re: K1100 caliper pistons on Sun Apr 22, 2018 8:21 pm

RicK G

RicK G
VIP
VIP
I would strongly advise against using pliers as you can and often will damage the hard anodized finish DAMHIK. It is a very durable finish but like glass and easily damaged.
I use compressed air and hold a rag in several layers in my hand over the piston.
As for splitting them I have never had a problem with getting them to reseal. I usually check for flat mating surfaces using wet/dry sandpaper on a glass surface, this also makes sure the surface is clean.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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