BMW K bikes (Bricks)

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1Back to top Go down   Slotted rear discs in ‘80s Ks Empty Slotted rear discs in ‘80s Ks Wed Feb 03, 2021 9:55 am

James P

James P
active member
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Tech question please. 
I know the original slotted rear discs on K series failed and were swapped for solid discs but I see on photos of my old (?’86) K100RS that the rear disc has slots that do not look standard but are oblique/circumferential (see my wanted advert on this forum!) and I wondered if this was a specific Australian modification, an option or something else. 
All replies welcomed,
J

    

2Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Wed Feb 03, 2021 10:43 am

moriarti

moriarti
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Im running slotted never had a failure. Just use what you prefer remember in the UK its more DAMP than DUST  Razz Razz


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1984 k100 rs red/black VIN  0004449
    

3Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Wed Feb 03, 2021 11:49 am

cycleman

cycleman
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The rear disk on my 86 K100RT went out of true and if you put a dial gauge on the surface there was an area that was out by approx 40 thousands. What would happen is that you would never have anything for rear brakes. If the wheel was stopped the rear brake would work fine, but once it was rolling the ever changing thickness wouldn't let the caliper/rear master adjust.  I know the previous owner rebuilt the rear master and I ended up putting in a new rear master before I found the problem.

That disk was the original disk and it had the slots. I went with a Brembo aftermarket rear disk for the K100 and it has the slots as well. Most solid disks would be found on the 70's bikes, mostly Japanese that I'm familiar with. They went away from the solid disks and everything know has slots/holes to aid in water drainage.

    

4Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Wed Feb 03, 2021 12:08 pm

Laitch

Laitch
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@cycleman wrote: Most solid disks would be found on the 70's bikes, mostly Japanese that I'm familiar with. 
Solid rear discs were OEM on Bricks, too. They can be found offered in BMW parts fiches and on model photos in advertising brochures in the Tech page here.


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1995 K75 81,000 miles
Slotted rear discs in ‘80s Ks Usa-lo10
    

5Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Wed Feb 03, 2021 2:22 pm

92KK 84WW Olaf

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Aftermarket EBC discs have holes but not slots. Original discs changed to solid rear discs.

My 83 RS had the original slotted disc same as the front discs, it eventually cracked. They had been recalled for this issue and the slotted discs changed out because of this cracking issue but mine hadn't been changed so I fitted the EBC one.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Thu Feb 04, 2021 10:12 am

cycleman

cycleman
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Thanks for that.

    

7Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Thu Feb 04, 2021 11:04 am

92KK 84WW Olaf

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Just to clarify the rear disc cracking happened suddenly, no advance notice. I had all the information on those early slotted discs and checked it regularly but in my case it just appeared suddenly. Parked bike, a little later noticed the crack and the 2 sides offset by maybe 2mm so it had not been there riding it. Rode home using front brake only. The slotted disc I took off is identical to the front discs. I just put in EBC disc instead, problem solved.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

8Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Tue Feb 09, 2021 11:20 pm

tinyspuds

tinyspuds
Life time member
Life time member
Just got my new EBC, to be installed when the snow thaws. The OEM had both: dropped below min thickness and warped in the gap between 57k miles to 63k miles.

OEM fronts are on the way out too but 2021 looks like it will be a low mileage year, so I’ll just wait for the next MOT.


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1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

9Back to top Go down   Slotted rear discs in ‘80s Ks Empty EBC Sun May 16, 2021 11:25 am

Snowman

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Just installed the EBC disc on my '85 RS. It costs a little more but the quality is great.
Slotted rear discs in ‘80s Ks Disc10

Slotted rear discs in ‘80s Ks Disc210

    

10Back to top Go down   Slotted rear discs in ‘80s Ks Empty Re: Slotted rear discs in ‘80s Ks Sun May 16, 2021 2:24 pm

Bonzo

Bonzo
Life time member
Life time member
@Snowman wrote:Just installed the EBC disc on my '85 RS. It costs a little more but the quality is great.
Slotted rear discs in ‘80s Ks Disc10

Slotted rear discs in ‘80s Ks Disc210

Yeah, I put EBC discs on front & rear and have been delighted with the quality  Slotted rear discs in ‘80s Ks 112350


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1990 K100RS 4V (VIN# 6406682)
2017 R1200RS SE Sport
    

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