I am changing the brake fluid of my 2006 LT (ABS3 intergral system).
The wheel circuits are done.
Now,the control circuits.
There are 6 bleeders on the unit, some are difficult to reach.
The official procedure says to bleed each bleeder.
I am asking to myself:
when making a fluid change whith no air in the circuit, do I actually need to bleed the 6 bleeders.
Do you think that bleeding only the 2 long ones could be enough.
(Illinois riders on their video bleed only two, but it is ABS2)
Thanks in advance for your advice
I hope you guys can still ride on your side of the Atlantic. Here in Montreal, the season is finished :-(
The procedure for CONTROL-Circuits is NOT that long considering that you only need to do it every 2 to 4 years (see below). That part of the whole bleed takes me about 1 hour. I am assuming you have the documentation for correct sequence to do these 6 ports (3 front and 3 rear)
In 2006, BMW came out with Service-Bulletin # 34 002 06 (019) that allows extended brake fluid renewal intervals for the “Integral ABS” system of many motorcycle models.
What was initially 2 years (for control-circuits) has been extended to 4 years. For a K1200LT with factory rubber hoses, they suggest to keep the "Wheel-circuit" interval every 1 year (no extension compare to initial specs)
In same Service-Bulletin, the “Control-circuits” has been simplified to the bleeding of only 2 “control circuit” ports on the unit (#3 and #6
in picture). In the past, the technician had to bleed 6 ports on the ABS unit. For those who do their own maintenance, note that the old (and longer) method must still be used when servicing any major component like the replacement of a brake line or the complete ABS unit.
MY PERSONAL OPINION on this:
a) because the "WHEEL circuit" reservoirs are partially vented (to outside air), the fluid will absorb more moisture, so they choose not to extend this one.
b) out of my 12 years ownership of the K1200RS, I have tried the new schedule and simplified 2 ports method only once. Next time I bleed the brake, the fluid was darker than usual, so I will stick to the old more conservative schedule and ALWAYS bleed all ports.
Obviously, you can do what you want it is your bike after all. By the way, a new ABS modulator cost is $US 2300 plus installation time ;-)