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1Back to top Go down   1990 K75S (ABS) Replacement discs. Empty 1990 K75S (ABS) Replacement discs. on Thu Nov 07, 2019 4:13 pm

mike d

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Hi All,


I've just been asked about the possibility of replacing the worn front discs on a 1990 K75S (ABS), and unfortunately have not come across the proposed solution. 
Note this is to replace just the disc portion, so mounting replacements on the original rotor.

The details I have are:


Bike has done c.90k miles & My Brake discs are fairly worn & a bit "wobbly". I'm aware Motorworks list various new discs, but all are a lot of money & I recently noticed what I think is a fairly new product by "We- Moto". They are just the Brake disc "ring", plus a load of small fittings & the description says that you "grind & Punch out the existing rivets", holding your existing disc "ring" to the centre aluminium bell, and screw together the assortment of "bobbins" & the supplied "ring", to make a floating disc. Cost £77 per side.
 
Have you heard of these, any opinions / feedback??
 
Specifically;
1/ Do we know what diameter are my existing rivets?
                     We- moto Photo is very small, but it looks like the  supplied screws are M5, which would be a lot weaker than a 5mm factory Brembo rivet me thinks.
 
2/ Mine bike is all together at present & the Rivet heads both sides are quite small & there doesn't look to be  that much room for bolt heads / Nuts, c/f the fork legs, or Calipers.
 
3/ Would be impossible to get bolt in behind the ABS ring, so would have to have the NUT that side, unless it is  possible to remove the ABS ring from the R/H disc, which I've never tried & doubt is possible.......


Anyone used this solution before?


Thanks in advance.


Mike

    

2Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Thu Nov 07, 2019 7:26 pm

Snod Blatter

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Have you got a link? I can't see these anywhere on Wemoto.

People have been bolting new brake discs to the old carriers for a long time but I've never heard of a bolt on semi-floating dealy, no idea how that would work scratch


__________________________________________________
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/
    

3Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Thu Nov 07, 2019 9:02 pm

mike d

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4Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Fri Nov 08, 2019 6:41 am

Ringfad

Ringfad
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Might this be an option (Front and Back discs are the same size on a K75 )

https://www.ebay.co.uk/itm/Brake-Disc-Rear-BMW-K100-82-90/143198217282

I have used one of these on the rear of my K1100RS and it works well. 
You need to remove ABS ring , grind out rivets, I used m5 bolts when fitting disc and then replace ABS ring.


__________________________________________________
1990 K75S (ABS) Replacement discs. Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

5Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Fri Nov 08, 2019 6:58 am

92KK 84WW Olaf

92KK 84WW Olaf
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I must admit I looked at doing this too but in the end decided new discs were less hassle, disc change is really fast. Adding the cost of the new fixings took a huge chunk out of the saving and whats not apparent is the risk of the new ones being out of true if it doesn't go together perfectly lined up. That risk doesn't arise with floating discs.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

6Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Fri Nov 08, 2019 8:36 am

Dai

Dai
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M6 button-head (dome head) A2-grade Allen bolts do the job. Both of my discs are held on by these.

http://www.ebaystores.co.uk/Kays-Fasteners/Button-Heads-A2-Stainless-/_i.html?_nkw=m6+stainless+steel+dome+head&_fsub=2275953012&_sid=112644402&_trksid=p4634.c0.m322

I've forgotten the length but I'm pretty sure I used 12mm. Domes to the outside (no washers), nuts on the inside. I also used nylock nuts with a dab of Loctite nutlock. Don't forget, the bolts are doing very little work in stopping the discs from rotating when you hit the brakes. Most of the work is done by friction/stiction between the disc and the carrier.

[Edit] Nearly 80,000 miles now with no problems but the discs are starting to look a bit worn...


__________________________________________________
'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)
    

7Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Fri Nov 08, 2019 9:26 am

92KK 84WW Olaf

92KK 84WW Olaf
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Don't forget, the bolts are doing very little work in stopping the discs from rotating when you hit the brakes. Most of the work is done by friction/stiction between the disc and the carrier.


Its exactly the same as working with structural steel, which is why getting the bolts right is so important.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

8Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Sat Nov 09, 2019 12:27 pm

Snod Blatter

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These are just the normal bolt-on rotor replacement, no fancy floating..?


__________________________________________________
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/
    

9Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Sat Nov 09, 2019 3:22 pm

mike d

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I forwarded the responses and a link to this site, but at the moment the chap who made the enquiry is looking at the offerings from M&P (in the UK).

I'll post when he responds again.

Mike

    

10Back to top Go down   1990 K75S (ABS) Replacement discs. Empty Re: 1990 K75S (ABS) Replacement discs. on Sat Nov 09, 2019 3:55 pm

volador

volador
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Silver member
Have you compared $$ with Tills.de

https://www.tills.de/bmw-k75-67/bmw-k75xx-133/


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

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