BMW K bikes (Bricks)

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1Back to top Go down   Brake discs Empty Brake discs Fri Mar 04, 2016 6:47 pm

BooG

BooG
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2Back to top Go down   Brake discs Empty Re: Brake discs Fri Mar 04, 2016 9:32 pm

Chocolate

Chocolate
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Hello!

Never heard of the company tsuboss  
171, Archimidou Str., 19400 Koropi. Greece
Before.

The price is real good, since the the oem and replacement disks for a K Bike are way over payed, compared to normal car or other motorcycle disk.

Would be interesting how they work.

Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

3Back to top Go down   Brake discs Empty Re: Brake discs Fri Mar 04, 2016 9:54 pm

Holister

Holister
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Off-road gear
TsuBoss

This forum conversation might be worth reading.
http://www.bikechatforums.com/viewtopic.php?p=1479848

Sounds like TsuBoss make wavey discs however the ebay adv describes those as "standard".
Price certainly looks good. Might be worth messaging the seller to make sure they aren't wavey.
cheers


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Brake discs Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down   Brake discs Empty Re: Brake discs Mon Mar 07, 2016 6:33 pm

Snod Blatter

Snod Blatter
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The subtitle of the listing says wavy, bit odd. Anyway, are you supposed to attach these to your old disc carriers yourself? K75s are the same as the 8v K100s when it comes to brakes, right?


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

5Back to top Go down   Brake discs Empty Re: Brake discs Mon Mar 07, 2016 8:33 pm

RicK G

RicK G
admin
admin
I would be inclined to give them a go. The price seems to be an honest price and as Chocolate says we have been paying far too much for consumable parts for a long time.


__________________________________________________
"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
    

6Back to top Go down   Brake discs Empty Re: Brake discs Mon Mar 07, 2016 11:48 pm

Holister

Holister
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@Snod Blatter wrote:The subtitle of the listing says wavy, bit odd. Anyway, are you supposed to attach these to your old disc carriers yourself? K75s are the same as the 8v K100s when it comes to brakes, right?
This is the front disc and carrier (riveted) listed on realoem.com
Part 34111457386 was found on the following vehicles:



It's easy to remove the old disc from the carrier and bolt the new one on.

  1. Remove the disc carriers from the wheel (4 bolts).
  2. Using a 4" angle grinder with a metal cutting wheel (not a grinding wheel), cut the rivet heads off from the disc side, NOT the carrier side. You don't want to damage the carrier. A grinding wheel will take ages because the rivets are quite hard but a cutting wheel will slice the flat head off quickly I found. Took me about 15 mins per wheel (I got nowhere fast with drilling). Don't worry about damaging the old disc. Carefully knock the rivet out of the carrier with a drift. Support the carrier to prevent damage and warping.
  3. Use *M6x20mm 304-stainless steel socket head-button head bolts with 304-ss nylock nuts (*you might need to check that size as its off the top of my head and its been a while). Tighten these up incrementally in a cross pattern as you would on an engine head to prevent any warping due to uneven tension. They will need tensioning fairly high. I didn't use lock-tite and mine have been in for 2 years, no problems.
  4. Clean the disc with brake cleaner before fitting.


Re bolts: 304 SS (A2-70) is reasonably high tensile corrosion resistant stainless steel. A4 bolts are slightly higher tensile and more corrosion resistant. Some say you should use titanium. I think that's over kill. Your local bolt shop should be able to find something more than suitable.
My bolts came with the discs and I think they were 304 (A2).

Careful using an angle grinder if you're not used to them. Use protective gear and gloves. Make sure the guard is fitted. 
Story... A good friend of mine works with a trauma surgeon at a major hospital here. A couple of weeks ago a guy was admitted to their A&E with an angle grinder lodged in his neck  affraid. They got it out ok and the guy recovered... just lucky I guess.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Brake discs Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

7Back to top Go down   Brake discs Empty Re: Brake discs Tue Mar 08, 2016 8:30 am

TacKler

TacKler
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Careful using an angle grinder if you're not used to them. Use protective gear and gloves. Make sure the guard is fitted. 
Story... A good friend of mine works with a trauma surgeon at a major hospital here. A couple of weeks ago a guy was admitted to their A&E with an angle grinder lodged in his neck  Brake discs Affraid. They got it out ok and the guy recovered... just lucky I guess.

A common reason people end up in A&E with pieces of angle grinder sticking out of their body is because they remove the guard to put on a larger sized disc.  One that is above the design parameters of the grinder. 

Some cynics would refer to this as natural selection and eligibility for a Darwin Award.  Brake discs 161205


__________________________________________________
Red 1991 K75S
    

8Back to top Go down   Brake discs Empty Re: Brake discs Mon Mar 29, 2021 1:06 pm

BooG

BooG
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I’ve finally undertaken my brake disc changeover as per the directions posted by Holister. I am using A4 grade dome head Allen bolts and my lock nuts.... just wondering what torque I should nip em up to? Any advice welcomed!

    

9Back to top Go down   Brake discs Empty Re: Brake discs Mon Mar 29, 2021 8:03 pm

gorio

gorio
Silver member
Silver member
A2 and A4 SS bolt torque

6mm 8.7N-m dry 7.8N-m Lubricated


or per Fastenal
7.61 Dry 6.52 Lubed


This is the standard recommend torque for these bolts. I would use the lower ones myself.

Hope that is of help


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

10Back to top Go down   Brake discs Empty Re: Brake discs Tue Mar 30, 2021 4:38 am

BooG

BooG
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Perfect! Top man!

    

11Back to top Go down   Brake discs Empty Re: Brake discs Sun Apr 04, 2021 6:50 pm

BooG

BooG
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There it is! So the bolts were a slight pita, but eventually came out with some vigorous persuading with a drift and hammer.
New disc looks the part....hopefully will be noticeable under braking conditions, although to be fair, I don’t use them much...apart from slow riding....so hopefully the “pulsing” will go!Brake discs 4df42110

    

12Back to top Go down   Brake discs Empty Re: Brake discs Sun Apr 04, 2021 10:48 pm

Michael Sydney

Michael Sydney
Silver member
Silver member
@BooG wrote:I’ve finally undertaken my brake disc changeover as per the directions posted by Holister. I am using A4 grade dome head Allen bolts and my lock nuts.... just wondering what torque I should nip em up to? Any advice welcomed!

Looking good, hope it works well.
Sorry to be casting doubt, but I notice your "locknuts" appear to be "nylock". I wonder if they are correct in this application given that they may get very hot in extended braking.. maybe enough to melt the plastic inserts.
Conventional nuts may torque better with a longer threaded section. Maybe an engineer could give an opinion.


__________________________________________________
Living in the past! K100 '83 and R65 '83.
    

13Back to top Go down   Brake discs Empty Re: Brake discs Mon Apr 05, 2021 12:37 am

charlie99

charlie99
VIP
VIP
check for runout on the disk carrier , just a heads up 

good luck


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OBrake discs 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 ..
    

14Back to top Go down   Brake discs Empty Re: Brake discs Mon Apr 05, 2021 12:38 am

Point-Seven-five

Point-Seven-five
Life time member
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Nylon has a melting point well north of 200C. It's pretty unlikely that the nylon inserts are going to melt and let the discs loosen up.


__________________________________________________
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
    

15Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 06, 2021 1:59 pm

BooG

BooG
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Platinum member
Thanks for the replies. Yes, the runout could be an issue regarding the nylock nuts. I’ll post back when I’ve attempted fitting the disc. 
I wonder what my options are if the nuts do interfere with anything.?? I wonder, could I cut the bolts back a bit and ( with the help of my persuading tool, encourage them to behave like rivits ?!?

    

16Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 06, 2021 3:01 pm

Laitch

Laitch
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@Point-Seven-five wrote:Nylon has a melting point well north of 200C.
According to the manufacturer U.S.Fasteners , their common locknuts have nylon inserts made from Zytel 101 which has a melting point ≤121ºC; their special order insert's melting point is ≤177ºC.


__________________________________________________
1995 K75 81,000 miles
Brake discs Usa-lo10
    

17Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 06, 2021 3:21 pm

gorio

gorio
Silver member
Silver member
You can always source out some top lock nuts. I know they are available in a lower profile as well. They use a small section of distorted threads to lock them in place thus eliminating the nylon insert and having a lower profile.

Might do the trick.
https://www.imperialsupplies.com/item/9157997


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

18Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 06, 2021 4:24 pm

Dai

Dai
Life time member
Life time member
Mmmm. You really don't want to know this. Really, really, really don't want to know this Shocked Very Happy

If you use button-head allen bolts, you can put them button-head side out. Looks a lot prettier and there's no clearance problems.

Okay I'm going Laughing Laughing


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

19Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 06, 2021 4:38 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Laitch, I suspect that the U.S. Fastener data sheet inadvertently copied the temperature from the DuPont technical data incorrectly. DuPont lists the Vicat softening temperature as 240C(465F) and the deflection temperature as 200C(390F). Melt temperature is 263C(505F). Nylon/Zytel has a rapid transition from solid to melt. As a result, it doesn't soften and maintains its mechanical properties at elevated temperatures until rapidly changing to a plastic state. I think the U.S. Fastener guy misread the C as an F when they copied the data.

If Zytel melted at 121C(250F), it wouldn't be one of the most used polymers in automotive under hood applications. As a point of reference, the polyethylene used in milk bottles melts at a higher temperature(>300F).

I doubt that the wheel hubs would get hot enough to melt it, and if they did, the larger problem would be rotor warpage.

http://www.engpolymer.co.kr/product/molding_guide/zytel_product_guide_V1.pdf


__________________________________________________
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
    

20Back to top Go down   Brake discs Empty Re: Brake discs Wed Apr 07, 2021 6:13 am

BooG

BooG
Platinum member
Platinum member
I have to say.... I am humbled by the depth of knowledge and detail around this issue! Tremendously appreciated!

    

21Back to top Go down   Brake discs Empty Re: Brake discs Wed Apr 07, 2021 7:02 am

JR_K100RS

JR_K100RS
Life time member
Life time member
A long while ago I replaced my front discs with an Italian brand called BRAKING , same deal , had to grind the heads off the rivets and tap them out , got a bit physical with a few and bent the carrier , when I fitted them I had pulsing as well , ended up having to replace one of the carriers

John Re

Melbourne Australia


__________________________________________________
Diamond Grey ( 617 ) 1987 K100RS ( European Delivery ) Original owner
    

22Back to top Go down   Brake discs Empty Re: Brake discs Mon Apr 12, 2021 5:55 pm

BooG

BooG
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Have placed the nuts the other way around now, (rotor-side). I’ll post back when I’ve attempted fitting again.

    

23Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 13, 2021 5:31 am

Dai

Dai
Life time member
Life time member
Brake discs 723598


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

24Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 27, 2021 5:23 pm

BooG

BooG
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Platinum member
Well....that worked then!
Isn’t it “Occam’s Razor” which states that the simplest explanation is usually the best?
So anyone else doing this: face the dome heads towards the hub, and the nuts facing the exhaust side. Job done!
Haven’t been out for a test run yet but I will shortly so watch this space!

    

25Back to top Go down   Brake discs Empty Re: Brake discs Tue Apr 27, 2021 5:24 pm

BooG

BooG
Platinum member
Platinum member
Dai......you da man!!

    

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