General Category > R1200 models

Flushing ABS

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B4ndit:
Its a 2011 GS. Reprom doesn't mention flushing ABS. So GS 911 seems to be the able to do it.

Jughead:
For what it's worth, my 2c ...

The 2011 ABS does NOT retain any fluid in the pump like the Servo assisted pumps do.

When bleeding the brakes, fluid is pumped from the master cylinder (on the handlebar for the front and at the brake pedal for the rear) directly and straight through the ABS pump to the slave cylinders on the wheels.  There is no place in the pump where fluid remains stagnant.

All the ABS bleed test function does is shuttle the valves inside the pump to ensure that no air is trapped in them.

On the older Servo pumps there are 2 reservoirs inside the pump, one for the front, one for the rear.  ie  On servo assisted bikes you have 4 reservoirs in total.  These are the pumps that need to be flushed.

WRT flushing the fluid, mine gets done every 10 000km or annually.  The exception to this is if I have have a brake fade, the fluid then gets replaced ASAP after the fade.  Since the fade is caused by the fluid boiling, its integrity had been compromised and imho needs replacing.
 
Brake fluid is one of those life and death things and at ZAR32/flush ...

B4ndit:
Now gone through this process. Took 500 ml of brake fluid in total and a good hour of my life.

Firstly I bled all brakes as usual. Then I put the caps back on the reservoirs.

The used the GS 911 to flush the ABS.

Then once again bled all the brakes in the usual manner.

Brakes are rather good now.

Haakon:
In a earlier posting I told to have both reservoir covers OFF.
I guess that is only when you flush a newly installed "MRAABSN" (ABS-N)
A lot of air trapped inside the ABS has to be "released" and may blow the reservoir lid off  :)
Haakon

Beemerboy:
@ Jughead,

You could concider using DOT 5.1 ( NOT DOT 5 !) brakefluid.

DOT 5.1    
Dry  boiling point: 260 °C (500 °F)    
Wet boiling point: 180 °C (356 °F)

as DOT 4
Dry  boiling point: 230 °C (446 °F)
Wet boiling point: 155 °C (311 °F)

Both DOT 4 and DOT 5.1 are polyethylene glycol-based fluids

greetz  ;)

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