BMW K bikes (Bricks)

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1Back to top Go down    Bleeding Brakes on Tue Mar 03, 2015 9:58 pm

Tom FKR

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G'day All, After reading a lot of previous posts on brake bleeding, have just spent about a lifetime trying to bleed thebrakes on the 86 K100RS aka the yellow beast. The reservoir on the MC was drained for repairs, installed but no luck in bleeding. Took up Rickmeister's suggestion of draining fluid right through the system by leaving both caliper bleeding screws open. this presumablyensured that the brake lines were filled with fluid and no air in the lines. Followed the Clymer instructions on bleeding ( after all everything else has failed) but still no luck.
Got some advice from my local mechanic who bleeds the MC by gently tapping the brake lever until all air bubbles have gone. Tried it and bingo, brakes bled in about 10minutes.
Feel better now that a new bit of information has been learnt. Cheers Tom

    

2Back to top Go down    Bleeding Brakes on Tue Mar 03, 2015 10:01 pm

Tom FKR

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G'day All again, forgot to mention the MC piston must be pointing upwards. I put the bike on the sidestand for this. Worked a treat. Cheers Tom

    

3Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 12:41 am

RicK G

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That wont work with the ABS equipped bikes. The banjo fittings will sometimes hold air bubbles and it can be very difficult to dislodge them and that technique can help.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

4Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 3:21 am

smithy

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You got a good result in the end Tom, well done.
I always bench bleed M/cylinders before I fit them, a habit I've gotten into.
I worked for a brake and clutch supply company, andwe had to benchbleed all m/cylinders prior to fitment.


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87 K100rs : Vin 9462
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

5Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 4:06 am

charlie99

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a good win tom

put it in the memory banks for all us In the future


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

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

6Back to top Go down    Bleeding Brakes on Wed Mar 04, 2015 4:11 am

Tom FKR

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Thanks for the info Rick and Smithy, Yep, good result in the end - just about given up -was turning blue in the face from sucking and blowing brake fluid.... Going to attack the rear brake next - should be much easier. Cheers Tom

    

7Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 4:46 am

charlie99

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

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

8Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 4:51 am

Inge K.

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Using this metod everytime when doing work on front masters,
(changing piston and cleaning bores) and it have been plenty of 20 mm's .
Emptied only reservoir and bore, refill reservior...turn handlebar full left,
move a bit to change the angle while getting the air out...loosen the clamp
around the handlebar so the MC angle also can be varied in that direction.

Start with long strokes on the lever, veeeeeeery slowly...it comes plenty of
air up inside thre reservoir in the beginning.
When it coming less bubbles (and it's very thiny ones) use shorter and shorter strokes.
When it seems to be no more air...vary the length of the stroke and area
along the bore...also vary the angle at the MC....it always comes a few
more tiny ones.......continue untill you are shure all air is out.

You can see the tiny bubbles inside the two small ports in the bottom of
the reservoir....when getting close to finish, it's often that it takes several
small strokes with the lever before the bubble you see in the bottom of
the port(s) comes loose.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

9Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 4:59 am

Holister

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hey Tom. Glad to hear you're getting that yellow beast into shape. Will hopefully be down your way sometime next month after easter. Hope to see it on the road for a run.
Cheers


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

10Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 6:38 am

Crazy Frog

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After I finish bleeding the system, I put the brake under pressure and lock the brake lever in this position for the night.
The next morning, when I release the brake lever, I always find that the last bubbles of air have made their way to the MC.

CF


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

11Back to top Go down    Re: Bleeding Brakes on Wed Mar 04, 2015 4:32 pm

sidecar paul

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I like to add a bleed screw to the banjo bolt at the top of the tube that passes through the steering column on early K's.

All in the interest of getting rid of every last bubble.

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

12Back to top Go down    Bleeding Brakes on Wed Mar 04, 2015 8:45 pm

Tom FKR

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G'day All, thank you for all your input which will be stored in my ever diminishing memory bank. Thanks heaps. Cheers Tom

    

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