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  #61  
Old 06-10-2013, 01:52 PM
Massive Lee Massive Lee is offline
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Re: How To: Change rear brake pads

Yup. I read three or four times that pdf file called "Integral brake bleed". Most of it makes sense. The only thing I don't understand is why there are two procedures. One for the brakes and one for the ABS pump. My thinking is that as the brake fluid goes thru the ABS pump anyway, why not simply bleed the three calipers thoroughly. That shall bleed the whole system. Then it got me thinking that the length between the front brake lever and the pump will not bleed as it is on a separate circuit.

It got me thinking that perhaps the bleeders located on the ABS pump are for the "control" part of the brake system. That is between the front brake lever and the pump.
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  #62  
Old 06-10-2013, 02:54 PM
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Re: How To: Change rear brake pads

You're on the right track with your thinking. You're used to an automotive system which has one master (usually, probably two on some of your race cars) and the ABS is inline with the single circuit. Well, multiple circuits, but only one fluid source all the way out to the calipers. The assist is usually added between the pedal and the master, so it's out of scope.

This system has four separate circuits! The lever and pedal are each a separate control circuit. The assist is built into the ABS unit where the control input gets translated to output to the calipers.

Since you're already very familiar with brake bleeding, the process isn't really all that difficult, just time consuming. You only have to learn how to get to all the bleed points and what order to do them. The calipers will do their own pressure bleed using the servo assist, so that part is really easy (just watch that reservoir level!). The ABS unit is a pain to get to and you shouldn't use vacuum bleeding, but it's all just standard techniques.

Oh, and you're right: it IS overly complicated. It's a nice system when it works, but lots of things to go wrong in that little box of motors, valves, and sensors. It doesn't help that the complex bleed procedure discourages folks from doing it regularly.
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  #63  
Old 06-10-2013, 02:55 PM
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Re: How To: Change rear brake pads

Quote:
Originally Posted by Massive Lee
Yup. I read three or four times that pdf file called "Integral brake bleed". Most of it makes sense. The only thing I don't understand is why there are two procedures. One for the brakes and one for the ABS pump. My thinking is that as the brake fluid goes thru the ABS pump anyway, why not simply bleed the three calipers thoroughly. That shall bleed the whole system. Then it got me thinking that the length between the front brake lever and the pump will not bleed as it is on a separate circuit.

It got me thinking that perhaps the bleeders located on the ABS pump are for the "control" part of the brake system. That is between the front brake lever and the pump.

The IABS system is typical German over-engineering at its best.....
In this case, I think it is "over-engineering at its worst" ;-)

Took me a while to understand it - a lot of digging (diagrams), reading and trial-and-error. Will explain in 5 minutes over the phone tonight and I am sure it will clear. Anyone like you with a mechanical background can understand it. Unfortunately, "it is what it is" and I would much prefer if I had the old ABSII on mine as the 1st generation K1200RS have (1997-2001).
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  #64  
Old 06-10-2013, 03:12 PM
Massive Lee Massive Lee is offline
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Re: How To: Change rear brake pads

It think it was made to look scary so that the dealer can either sell the $500.00 bleeding service, or the $2500 pump change. Whatever comes first.

BTW if those of you have ever seen the oleopneumatic suspension system on a 1960s Citroen DS, then this BMW ABS is a piece of cake... Better have a German vehicle than a French one.
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  #65  
Old 11-25-2013, 01:32 PM
Judas2610 Judas2610 is offline
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Re: How To: Change rear brake pads

Thanks for this great guide! Replaced pads today.
Any chance you could do a guide for the front pads?
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  #66  
Old 11-25-2013, 01:59 PM
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Re: How To: Change rear brake pads

Quote:
Originally Posted by Judas2610
Thanks for this great guide! Replaced pads today.
Any chance you could do a guide for the front pads?

Based on a picture you posted in your intro thread, I see you have the Integral-ABS (2001 and later in Europe). Pads mounting and calipers are a bit different on earlier models.

For front brake pads on your K1200RS, see this thread for a text of the procedure (about half-way the thread): http://www.i-bmw.com/showthread.php?t=45761

For some pictures from another member, see this: https://plus.google.com/photos/11463...55960663213505
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  #67  
Old 11-27-2013, 05:02 AM
Judas2610 Judas2610 is offline
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Re: How To: Change rear brake pads

Cheers Jean!
A question though - I see mention of ABS II and ABS III in various threads.
Which do I have on my bike?
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  #68  
Old 11-27-2013, 08:49 AM
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Re: How To: Change rear brake pads

Quote:
Originally Posted by Judas2610
Cheers Jean!
A question though - I see mention of ABS II and ABS III in various threads.
Which do I have on my bike?

In my previous post, I wrote: "Based on a picture you posted in your intro thread, I see you have the Integral-ABS (2001 and later in Europe)."

ABSII (or ABS2) is on K1200RS between 1998 and 2001 for USA (1997 to 2000 for Europe/Canada)

Next generation of ABS, Integral-ABS, also sometimes called ABSIII although not technically correct. This is installed on all later model - 2001 and later for Europe - 2002 and later for USA.

They are VERY easy to differentiate by the noise the Integral-ABS modulator does when: Ignition ON, do NOT start engine, press front handlebar lever for 3 seconds. Integral-ABS has electrical booster (servo-assist) and these pumps are very noisy.
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  #69  
Old 06-29-2015, 06:16 PM
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Thumbs up Re: How To: Change rear brake pads

Great write-up.

Just did my 2002 K12RS.

The pins and spring were coated with rust.

Lubricant applied to prevent further rust.
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  #70  
Old 04-04-2017, 05:52 PM
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Re: How To: Change rear brake pads

Excellent demo, thanks.
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  #71  
Old 04-04-2017, 09:22 PM
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Re: How To: Change rear brake pads

Quote:
Originally Posted by BMW
Great write-up.

Just did my 2002 K12RS.

The pins and spring were coated with rust.

Lubricant applied to prevent further rust.

I am pretty sure the Stainless pins are available through Motobins.Same caliper hardware than many airheads going back to the 80s.Same rust problem.
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  #72  
Old 04-05-2017, 01:28 AM
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Re: How To: Change rear brake pads

A wire wheel/brush cleans 'em up..apply a heavy grease (lightly) on the pins on refit..from memory, the pins on the K100 are the originals, & they are a bit "pitted", yet still serviceable.. (although the K100 hasn't seen road duty for about 5 years...ever since "down").

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