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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Brake seal woes

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1Back to top Go down   Brake seal woes Empty Brake seal woes Tue Jul 18, 2023 10:40 pm

KiwiK100

KiwiK100
Gold member
Gold member
Hey all, I ordered two sets of Ariete seal kits from Moto-bins for the front callipers of my ‘83 K100. Yes, I know this has been covered before and I’ve read (after the purchase) that they don’t fit the early callipers. 
So I took my verniers and measured the new seal against the old seal. Bear in mind the old seals are likely original however they were not leaking.
Ariete .130in/3.30mm
OEM   .112in/2.86mm
Unfortunately I’m unable to measure the depth of the seal rebate but the above measurements show a significant difference in seal thickness of nearly .5mm. 
Anyway, Damien at Moto-bins has looked after me like royalty and has also amended their website to show that these kits do not fit early K callipers. I’ve now ordered sets of the Brembo kits, as others on board here have done. Interestingly (and we’ll documented previously) the BMW part number on the Moto-bins website when searched comes up with R models only. We learn. 


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

2Back to top Go down   Brake seal woes Empty Re: Brake seal woes Wed Jul 19, 2023 6:56 am

Dai

Dai
Life time member
Life time member
It's irrelevant to your problem, but if anyone goes hunting for the later seals and gets told 'we don't have any in stock', ask for a set for Moto Guzzi T3 calipers. They're the same.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   Brake seal woes Empty Re: Brake seal woes Wed Jul 19, 2023 9:26 am

92KK 84WW Olaf

avatar
Life time member
Life time member
I have already flagged this problem as I had found it back in 2018/9 when I got an 83 RS and already had [and still have] 84 K100RT. 84 seals do not fit 83 seals.

Later and early seal kits differ, I already knew that, but then found this issue with 83 K bikes bewing different from 'early' as in 84 Ks.

Dai has mentioned one solution, another is to order seal kits from R bikes as those calipers went on early Ks but opposite way round.

There is more of this kind of thing too. Gas tank cap, clocks, I found others but in most cases a work around was possible for me because of having lots of parts.


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

4Back to top Go down   Brake seal woes Empty Re: Brake seal woes Wed Jul 19, 2023 10:25 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Could you replace the calipers with later model units?  I think the mounting points and the rotors are the same as later models.  I think that eliminates the hassle with pad size as well.  I mean, as long as you are rebuilding them, why not a set of used later model units.  Seems to be a lot of them out there.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Brake seal woes Empty Re: Brake seal woes Wed Jul 19, 2023 6:30 pm

KiwiK100

KiwiK100
Gold member
Gold member
Thanks Dai, the BMW part number attached to the K100 Ariete rebuild kits state they fit R models spanning ‘76 - ‘92 so definitely something amiss there. I’ll search Brembo for their kits to suit early ‘80 R bikes.


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

6Back to top Go down   Brake seal woes Empty Re: Brake seal woes Thu Jul 20, 2023 12:45 am

92KK 84WW Olaf

avatar
Life time member
Life time member
Point-Seven-five wrote:Could you replace the calipers with later model units?  I think the mounting points and the rotors are the same as later models.  I think that eliminates the hassle with pad size as well.  I mean, as long as you are rebuilding them, why not a set of used later model units.  Seems to be a lot of them out there.
That would be correct. 55mm pads for early calipers and 57mm pads for later ones which you can use sintered pads in.

But there are two different types of the early calipers that take the 55mm pads. Thats where I ran into trouble. A change from 83 to 84. And yes, swapping the calipers to later ones would make sense.


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

7Back to top Go down   Brake seal woes Empty Re: Brake seal woes Thu Jul 20, 2023 7:32 am

Dai

Dai
Life time member
Life time member
How about some heresy? Very Happy File back the caliper casting by 1.0mm either side of the piston. Problem solved for no additional money (well, only if you don't have to buy the files...). Seriously though, somehow I ended up with just one early caliper, so that's exactly what I did. There's a lot of ally there so you're not destroying structural integrity.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

8Back to top Go down   Brake seal woes Empty Re: Brake seal woes Thu Jul 20, 2023 7:51 am

92KK 84WW Olaf

avatar
Life time member
Life time member
Dai wrote:How about some heresy? Very Happy File back the caliper casting by 1.0mm either side of the piston. Problem solved for no additional money (well, only if you don't have to buy the files...). Seriously though, somehow I ended up with just one early caliper, so that's exactly what I did. There's a lot of ally there so you're not destroying structural integrity.

Or grind down the sides of the brake pads? I bought some '55mm' pads that are not quite fitting the early calipers. I just filed the sides until they slipped into the caliper.


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

9Back to top Go down   Brake seal woes Empty Re: Brake seal woes Thu Jul 20, 2023 10:37 am

Dai

Dai
Life time member
Life time member
It was after the second set of pads that I inverted my thinking. Do once and forget it Very Happy


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

10Back to top Go down   Brake seal woes Empty Re: Brake seal woes Thu Jul 20, 2023 7:10 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
Dai wrote:It was after the second set of pads that I inverted my thinking. Do once and forget it Very Happy

Ding  Brake seal woes 723598


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

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