BMW K bikes (Bricks)

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1Back to top Go down   Bleeding Brakes Empty Bleeding Brakes Mon Feb 21, 2011 12:20 am

Rickmeister

Rickmeister
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My K100, 1990, with ABS, is due for a brake fluid flush. I have
gotten hold of a vacuum pump that airconditioner people use. I connected
the suction spiggot of the pump to the lid of a glass jar using a 6mm plastic tube, and with
another connection from the same lid, to go to the bleed nipples of the
ABS modulator and calipers. I've tried it on the bench and
it can fill the jar very quickly from a bottle of old brake fluid...too
much suction. I will install a valve in series with the vacuum line to
try and control the suction.

My reading so far (the recent "How to..." articles that Bert posted, great stuff!!) indicates that the
modulator/master cylinder line should be flushed first, then the RHS
front caliper and the the LHS front caliper for the front brakes. For
the rear brakes, master cylinder/modulator line and the the rear
caliper.

My understanding is that as long as the master cylinder
has fluid in it for the whole duration of the flushing (sucking) process, that no
grief will be encountered.

Are there any special traps I need to look out for, as I have not done this before?

Thanks,

Rick G.

(PS, off to Phillip Island for the SBKs and Alpine Way and Victorian Alps on Wednesday, for six day ride! Will do the flushing upon my return.)

    

2Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 1:34 am

blaKey

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What comes to mind is having a bucket of water and a cloth handy in case you spill some on the paintwork.


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

3Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 2:30 am

charlie99

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<<<<is jelous rick .......sounds like bliss to me .......enjoy friend


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OBleeding Brakes Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 2:15 pm

BIG D

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Cool

As you mentioned it that is the same way I did my 89 K100LT ABS
and I had no problems just made sure I did not run the master cylinder low on fluid and did the job slowly and as Blakey said cover your paint work and mop up any spillage quick.

BIG D

    

5Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 7:16 pm

Rickmeister

Rickmeister
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Thanx, Lads! I've been laying in bed at night...if I can get hold of an old fluid reservoir lid, screw in a spiggot, get another jar with a spiggot in the lid and a copper tube from the inside of the spiggot down towards the bottom of the jar, connect the two with tube, fill the jar with new brake fluid. As the fluid is sucked from the modulator/caliper, the fluid level in the master reservoir will fall, causing clean fluid to be sucked into the reservoir, a more or less closed system. A bit "Gyro Gearloosey" but I might make further bench tests.

Has anybody out there done/seen this sort of thing before?

    

6Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 8:11 pm

Guest

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This is what I use when the going gets tough, ie, I'm not using the milking-a-cow manual method. It attaches to an air compressor, then the nipple of the caliper you're bleeding, by pulling the nasty old fluid down into the receptacle, and is quite efficient. You have to keep a close eye on the master cylinder's fluid level, however. I think it cost me around thirty AUS dollars a coupla years ago from the local Trade Tools Direct. The brake lever's left firmer than a catwalk model's tummy.

Bleeding Brakes Brakeb10

    

7Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Mon Feb 21, 2011 8:43 pm

WayneDW

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Harbor Freight sells an inexpensive bleeding pump as well. No compressor though, just squeeze the handle to create the vacuum.

http://www.fossilapostles.com
    

8Back to top Go down   Bleeding Brakes Empty Harbor freight tool works Tue Feb 22, 2011 12:15 am

bobgass

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I have the Harbor Freight hand pump tool as well. It does a good job as Wayne states, but does pull that liquid down quickly. Have clean fluid ready to go into the reservoir before squeezing!

    

9Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Tue Feb 22, 2011 4:09 am

charlie99

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@Two Wheels Better wrote: The brake lever's left firmer than a catwalk model's tummy.


hmm i better go back school ...i never did that corse ....with the models tummy before ....grin


lots of great info guys .....Thanks all

    

10Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Wed Feb 23, 2011 3:10 am

Ajays

Ajays
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I do mine from the bleed nipples UP...Crazy Frog has the best syringe to do the job. Lots on this in previous postings.
Ajays


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AJAYS
    

11Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Wed Feb 23, 2011 9:06 am

blaKey

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For those of you that like to bleed your brakes the "other" way (squeezing the lever and twisting the bleed screw), zip-tie a piece of wood to the right hand grip so that it stops the brake lever traveling too far.

This limits the travel of the piston into the area that it normally doesn't travel, so you won't tear-up your seal if you have a corroded bore.


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

12Back to top Go down   Bleeding Brakes Empty Re: Bleeding Brakes Wed Feb 23, 2011 6:44 pm

Crazy Frog

Crazy Frog
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Smart cookie!


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Bleeding Brakes Frog15Bleeding Brakes Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

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