General Category > ABS related issues

Bleeding brakes

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Hexane12:
I have a late 2007GS. The brake system on the bikes allows them to be conventionally bleed using a piece of tubing, a bottle and the brake lever. Whilst using my GS 911 I notice there is a brake test facility which allows the ABS unit to flush the brake fluid from the module to the master cylinder. Do I use this option with my conventionally bled brakes?  I have bled the brakes successful in the past being unaware of this "Brake test" option.

Haakon:
My personal view on this (many owners will not agree)
BMW service instructions say the ABS bleed function is just to be used if the ABS have been changed (or opened)
The spare ABS units come without fluid.
That said- if you do change the fluid it is for a reason.
The fluid is water contminated or just "too old".
IF the ABS have been in action that same old fluid will also be in the ABS unit.
I will say yes- if for no other reason, just to move the pumps and valves inside the ABS.
I change my fluid every year.
I first do a regular change- then do the ABS and last do another fluid change.
(To get rid of whatever fluid that was inside the ABS.
I have had vapour "lock" (right word?) and lost all braking action, very scary!
Haakon   

StephanT:
I know of many BMW techs that don't do it... i.e. they do the conventional bleed only... that doesn't make it right though...

If you are pressed for time and it was just an annual flush, skip it (if you feel comfortable with your bleed and happy with the result)... however, I always do it... it's the correct procedure according to the motherland  ;D ..and probably does not even take 5 minutes extra, for both circuits...

best,
Stephan

malmac:
Hexane12

When you say you have a late 2077 model should I assume that it does NOT have the servo assisted brakes?

I have an early 2008 model and I am looking at how to best bleed the brakes so that the fluid in the ABS pump is correctly flushed with new fluid.


Thanks


Mal

malmac:
For those of you who don't know and are looking for an answer - well trust me I am still in the dark too.

What have I learned, well bleeding the brakes is a most frustrating exercise and while I have tried;
1. normal bleeding
2. pushing the brake fluid from the nipple up - I made up a special nipple which doesn't leak, to do it
3. slight pressure bleed from the master cylinder down

I still feel like I have a pocket of air in the front brake lines.

For those of you who know about the GS911

Is there any way the GS911 model can be used in the brake bleeding process to flush air out of the ABS system?

Does anyone here know if the BMW laptop super brain system, actually does anything like actively participating in the bleeding process?

I have ridden the bike with the new ABS unit installed,

1. Took awhile for the new pads to bed in start releasing from the discs fully - seems to be 95% OK now
2. ABS light flashes when ignition is turned on (before it immediately went solid red
3. ABS initialises when I ride off, ABS light goes out
4. ABS works with back brakes activated to lock up - ABS light does not come on
5. ABS works with front brakes to lock up - ABS light does not come on
6. Ran GS911 - no error codes

So all in all that looks like mission accomplished - but I am told the BMW system needs to have the new ABS controller linked to the ECU or central brain or what ever. Does anyone actually know what that does?

Mal

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