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08-Jun-2011, 06:28 PM (978)
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More brake issues
Took the 2005 GS to the dealer for the inspection Saturday. After 24k miles the rear brake pads were thin. Bought some new ones on the spot but hadn't installed them yet. Then, yesterday, I noticed that the rear brake pedal was going waaaay down. Seemed like I didn't have much for rear brakes. So tonight my son and I pulled the brake caliper and replaced the pads. I loosened the bleed valve to get the pucks back into the caliper. No problems. Got the caliper back on. Ok, time to replace the fluid, it's been a few years. But I don't have any one way valve or speed bleeders. Is it possible to get the job done with the old "valve open, valve closed" technique and four hands? Or do I have to get the special valves?
Finally, what's the easiest way to get to the servo bleeder? Looks like a few bits have to come off to get there? Thanks, Eric 
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08-Jun-2011, 06:40 PM (986)
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I have not had to bleed the brakes on my 09 GS but if and when
I do I am going to take a hard look at the bottom up "Mityvac" series of products. In theory the "4 hands" red neck procedure should work but that is in theory. 
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08-Jun-2011, 06:46 PM (990)
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I've got a Mityvac...
...it did a great job of sucking the last of the fluid out of the servo.
Of course I'm thinking of riding w/o the back brake working. I hear that a lot of racers don't use the back brakes anyway. Am I nuts?
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08-Jun-2011, 11:01 PM (167)
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A Mightyvac can damage the servo ABS unit according to BMW (but I've never read of it happening).
You can't ride without a back brake because your bike has a linked braking system. When you pull the hand lever BOTH brakes are operated. When you step of the foot lever only the back brake is operated. Servo bleed is not hard, just time consuming. The tank has to come off to get access to the servo unit. Full instructions in excruciating detail are at http://advwisdom.hogranch.com/Wisdom/service_abs3.pdf http://advwisdom.hogranch.com/Wisdom...ng_adapter.pdf ABS 3 is what folks called iABS (the servo system) when it first came out. Don't let the fact that the instructions are for an oilhead bother you. The servo brakes are the same on the early hexheads. Lastly the above docs talk about bleeding the control circuits 4 times from three bleed points for both the front and the rear circuits. BMW made that easier... you only need to bleed from the "tall" bleed unit on the ABS unit. Here I'm bleeding the rear control circuit...  My 60K service including brake bleeds... http://www.snafu.org/pics/r1200gs/2011/0122-service/ Last edited by marc; 08-Jun-2011 at 11:03 PM (169).
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09-Jun-2011, 10:07 AM (629)
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I'm wondering why the back brake pedal travel went way up in the last few days, too..
That seems to be odd and probably not related to the brake pad wear, unless the pucks were so far out of the calipers that the oil in the servo unit was low. The odd thing is that both master cylinder reserviors were full and aren't lowering any. That seems odd too.
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10-Jun-2011, 04:33 AM (398)
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If you want to minimise rear pad wear, clean the brake dust out of the holes on the rear disc at regular intervals. One of the techs at my local Motorrad dealership told me that the build up of brake dust in these increases pad wear.
__________________
"A map is not the territory it represents, but if correct, it has a similar structure to the territory, which accounts for its usefulness". Alfred Korzybski
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