BMW K bikes (Bricks)

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1Back to top Go down    Fork Seals and Steel Braided lines on Sun Aug 12, 2018 9:04 am

yamaguzzi

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I just did the seals and all the brake lines and pads in my K100. Everything went well and she's all back together ready for a test ride. Later this week I plan on taking the bike on it's first long distance ride since I brought her back to life last year. Anyway,when I was doing this work I saw that the rubber bellows under the upper faring were all torn and falling apart so I left them off until I can get replacements. What I am wondering is can this cause a problem in rain or am I just thinking too much. Ed


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

2Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 10:52 am

duck

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They're worthless. BMW didn't bother to include them on later bikes. Forget about them and don't bother trying to replace them.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 12:24 pm

Ringfad

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+1

I got new ones for my 8v RS and the did not last very long before they were ripped.


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;BMW;K100RS Style Black 1987 105K Km ;BMW; K1 Black 1993 51KKm ;BMW;K1100RSRed 1993 70k miles ;BMW; K100 16V Black (ex ElectricMonk)
    

4Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 12:52 pm

ARbiker

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Anything that helps to prolong the life of the fork seals is a bonus in my opinion but any gaiters of sufficient diameter should do the trick

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5Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 4:07 pm

MartinW

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I replaced my seals about twenty years ago. The replacement seals are still going. What I did was pack heavy silicone grease (Herschells) under the dust covers and change the grease every couple of years. If you ride in dusty conditions change the grease more frequently. I also pack silicone grease under the rear master cylinder boot to keep out the water and crap.

There is a tool called a Seal Mate or Seal Buddy (Ebay) that has been used by others to fix seal leaks and clean out any crap. They can be bought or made out of an old soft drink bottle. I have made a few to supply a couple of mates bikes suffering from leaky seals. Depending on damage it sometimes works sometimes not. The application of an ATF soaked rag on the seals and allowed to soak for a while will also soften up hard seals. However by using the silicone grease that's all I have ever needed to do.

Regards Martin.



Last edited by MartinW on Sun Aug 12, 2018 4:09 pm; edited 1 time in total (Reason for editing : Bad link)


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6Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 6:26 pm

yamaguzzi

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Thanks for the input.I had a feeling those bellows things were useless but thought I had better ask.I like the silicone grease idea packed under the dust seals. I think I'll try that and do it before I leave on my trip this coming Thursday It sure can't hurt. Do you pack the whole dust cover or just put a bead over the seal? The bike is all back together and all that is left to do is get the rear brakes to bleed. For some reason I can't get all the air out after replacing the rubber hose with a steel braided one.They worked fine before. Oh well I'll get it done later on.I'm psyched to get out on an actual road trip on this bike.


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

7Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 6:59 pm

MartinW

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I pretty well fill it up. I used to use the $50.00 AU per tube Dow Corning high vacuum grease that was required on the K75 fluid damper. I have since located a pretty good substitute, Hershells Silicone Paste $8.00 AU per tube at Supercheap. It is not as thick as the high vacuum grease but it also does the job at a reduced price.

Regards Martin.


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K75s Hybrid
    

8Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 7:10 pm

MartinW

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To get the air out I use a home made vacuum bleeder. However if you move your bars to the far left so that the reservoir is at the highest point. Then pump the lever while gently tapping the hose and master cylinder with the reservoir cap off you should observe air coming up. If that doesn't work then pump and secure the lever with a bungy cord so that the lever is being pulled and leave over night. The bars need to be turned to the left, and occasionally tapping the hose and master cylinder does help.

Regards Martin.


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K75s Hybrid
    

9Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 9:23 pm

yamaguzzi

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@MartinW wrote:To get the air out I use a home made vacuum bleeder. However if you move your bars to the far left so that the reservoir is at the highest point. Then pump the lever while gently tapping the hose and master cylinder with the reservoir cap off you should observe air coming up. If that doesn't work then pump and secure the lever with a bungy cord so that the lever is being pulled and leave over night. The bars need to be turned to the left, and occasionally tapping the hose and master cylinder does help.

Regards Martin.
It turned out to not be air in the fluid.What happened was that when the hose was disconnected the piston moved and got stuck on that set screw that keeps it from shooting out the end of the master when there is no pedal in front of it. As soon as I turned that screw slightly the piston shot forward and I had line pressure . Now both front and rear brakes are solid as a rock.Tomorrow I test ride it ,change the oil and she's ready to travel !


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

10Back to top Go down    Re: Fork Seals and Steel Braided lines on Sun Aug 12, 2018 9:26 pm

MartinW

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Go forth and enjoy the fruits of your labours.
Regards Martin.


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K75s Hybrid
    

11Back to top Go down    Re: Fork Seals and Steel Braided lines on Mon Aug 13, 2018 8:23 am

yamaguzzi

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@MartinW wrote:Go forth and enjoy the fruits of your labours.
Regards Martin.
Thanks Martin I will !


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

12Back to top Go down    Re: Fork Seals and Steel Braided lines on Mon Aug 13, 2018 9:27 pm

brickrider2

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A tube of handy silicone grease can be had at any Napa parts store for a reasonable amount of money. Grease under those caps won't do a thing to prevent stone nicks on the forks tubes, which kill the seals. BMW gaiters may or may not be the best quality; you decide. However, many riders opt for Rancho Suspension gaiters, which are economical and available in many sizes as well as colors.

    

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