BMW K bikes (Bricks)

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1Back to top Go down   brake bleeding woes Empty brake bleeding woes Tue Jan 12, 2016 5:27 pm

eire1400

eire1400
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3 jobs to go to before I get to ride the k100 again. Exhaust mod, paint and sort the brakes after replacing the line between the master cylinder and head stock. 
Brakes have been wrecking my head for the last 2 days. I borrowed a bleeding kit and pumped away for ages no drop of fluid in res. Tonight I got hold of a large syringe, and tried to reverse bleed by emptying the reservoir and pushing from the caliper. One caliber started dripping fluid out onto disk, on the other side I couldn't get fluid to travel. Any one tips or tricks.
 Bleed a few different bike clutch and brakes but never had grief like this before.

    

2Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Tue Jan 12, 2016 5:44 pm

Dai

Dai
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Not sure what you mean by this:

'One caliber started dripping fluid out onto disk' ?

Out of the nipple or the piston? Otherwise, what you're describing sounds like a classic case of dirt in the return port in the master cylinder. There's two holes in the m/c piston; the return port is the one closest to the instrument cluster. The other possibility is that the inner seal in the m/c has gone which will allow fluid backwards and forwards but won't pump any fluid.

Any other ideas, guys?


__________________________________________________
1983 K100 upgraded to K100RS spec, 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 bleeding woes Empty Re: brake bleeding woes Tue Jan 12, 2016 6:06 pm

eire1400

eire1400
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Fluid was leaking out around the nipple. Maybe I had it open too much and fluid was forced out the thread? The 2 holes you speak of... in the end of the master cylinder in the black hole?

    

4Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Tue Jan 12, 2016 6:53 pm

Inge K.

Inge K.
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@eire1400 wrote:The 2 holes you speak of... in the end of the master cylinder in the black hole?

Read all about it............here.


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

5Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Tue Jan 12, 2016 8:02 pm

Dai

Dai
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Thanks Inge.

Yes, to the nipple question. I'd be thinking seriously about overhauling the m/c, but that's just me. The information in Inge's link may work for you, but bear in mind that the coloured line drawing is of a tandem master cylinder and not the single m/c found on bikes. The principle is the same and it does show where the return port is relative to everything else. Sort of... just look at the bluey-green part and ignore the ladies bit.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

6Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Wed Jan 13, 2016 4:06 am

eire1400

eire1400
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Wire brush bristle at the ready, I'll attack it tonight and report back. Under a bit of time pressure now as its booked in with a friend for Friday evening to get exhaust work!! never a good thing! Thanks again folks.

    

7Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Thu Jan 14, 2016 1:25 pm

eire1400

eire1400
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Nail on the head again. Thanks folks.  Took the master cylinder apart and it was black with dirt. Seals were in perfect condition so just have it a massive clean.  Wire brush bristle to clean the tiny hole and compressed air to blow it out.  Came up nice.  Reassembled, reversed bleed the system and the brakes are better than ever.  Got out for a pre paint spin around the town today.  Loving it.  Thanks again for the help

    

8Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Thu Jan 14, 2016 2:00 pm

92KK 84WW Olaf

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@eire1400 wrote:Nail on the head again. Thanks folks.  Took the master cylinder apart and it was black with dirt. Seals were in perfect condition so just have it a massive clean.  Wire brush bristle to clean the tiny hole and compressed air to blow it out.  Came up nice.  Reassembled, reversed bleed the system and the brakes are better than ever. Got out for a pre paint pint spin around the town today.  Loving it.  Thanks again for the help

Man you English is getting bad. I fixed that type for you since you deserve break.

I suppose I should now go and get mine running. Just needs ignition timing reset.....


__________________________________________________
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
    

9Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Thu Jan 14, 2016 2:27 pm

eire1400

eire1400
active member
active member
Not on a school day!   Haha I like it.

    

10Back to top Go down   brake bleeding woes Empty Re: brake bleeding woes Thu Jan 14, 2016 2:57 pm

92KK 84WW Olaf

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@eire1400 wrote:Not on a school day!   Haha I like it.

No school today where I live. Road frozen over again today, it rained on the frozen surface both mornings so no going out until later in the afternoon and it was still frozen.


__________________________________________________
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
    

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