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"KRS/GT" Technical Q&A K1200RS/GT Technical Questions/Answers

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  #1  
Old 10-22-2018, 04:08 AM
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Brake action troublesome???

Hi Team, hope you can help. New to me K1200GT ('04) which has been serviced by a non-BMW dealer. They have replaced the rear brake disk and brake shoes and 'replace brake fluid front and rear' with 'FERODO FBZ025 BRAKE FLUID DOT 5.1 (2x250ML)' which sounds odd (not enough for the whole system).

I have an issue with the brake, where pulling the handle initially gets you nothing/very little brake action and then suddenly almost full brake engagement. Made the trip from Brisbane to Sydney over Tamworth a really interesting one.......

Any advise? Thought about air in the system, but the sudden severe action almost excludes that (right?).

Appreciate your thoughts/tips.

Thanks, Rene
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  #2  
Old 10-22-2018, 07:57 AM
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Re: Brake action troublesome???

Rene, the service manual specifies DOT 4 brake fluid. That being said, it sound like there is air in the system and should be bled again. I would completely flush the system to get the DOT 5.1 out of it.
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Old 10-22-2018, 01:16 PM
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Re: Brake action troublesome???

DOT 5.1 is a legitimate replacement for DOT 3 and 4 fluids. Have you replaced the rubber brake lines on the bike. If not do so. The liners of the old rubber lines come apart and block the tube in strange ways and also simply burst.

(It is DOT 5 that is not compatible with the DOT 4 that is normally used in the bike)
And you imply you did not have enough fluid for replacement...?? don't mix brands or types.
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Old 10-22-2018, 02:53 PM
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Re: Brake action troublesome???

Curious, are you ABS lights acting up in any way before/after these incidents? On my first RS, I had issues with the ABS pump and experienced behavior similar to what I believe that you are describing before the pump completely shit the bed for good.

Edit: to be fair, the ABS pump experienced issues after a fluid change whereby some air was induced, so whether by pump or air, I'd definitely have it bled again. As Beech mentioned, DOT 5.1 is a suitable (and higher rated) alternative for DOT 3 or DOT 4. DO NOT confuse this with straight DOT 5 (without the dot 1) being the same. DOT 3 & 4 do NOT mix with DOT 5 which is silicone based.
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Old 10-22-2018, 04:22 PM
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Re: Brake action troublesome???

Quote:
Originally Posted by Beech
DOT 5.1 is a legitimate replacement for DOT 3 and 4 fluids.
Yes, thanks for the clarification Beech.
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  #6  
Old 10-23-2018, 05:10 AM
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Re: Brake action troublesome???

My 1997 K1200RS brakes changed completely once I fitted Goodridge Aeroquip hoses.

If the bike is a 'keeper', you need braided hoses.

Once refilled and bled, try wrapping a bungee cord around the lever and grip, holding the front brake on when bike is parked up overnight. This seems to allow any microscopic air bubbles to escape into the master cylinder - and give you a great firm front lever.
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Old 10-23-2018, 06:40 PM
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Re: Brake action troublesome???

Thanks guys. Doing the bungee thing at the moment and indeed, will change out for braided lines. Had a look if Spiegler was available in Oz, but didn't see them (yet)... Brgds, Rene
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  #8  
Old 10-23-2018, 07:36 PM
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Re: Brake action troublesome???

Quote:
Originally Posted by hfxrzw
Thanks guys. Doing the bungee thing at the moment and indeed, will change out for braided lines. Had a look if Spiegler was available in Oz, but didn't see them (yet)... Brgds, Rene

Check out out one of our site vendors, Pirate at www.pirateslair.net he will likely be able to help you out with the Spieglers.
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Old 10-24-2018, 05:11 AM
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Re: Brake action troublesome???

Rene, living across the Ditch, we have the same problems sourcing parts as you do. Hel Brake lines are a UK company that have a division in Australia.
http://www.motorcycleracegear.com.au...ake-lines.html
I used them to build a set for my K100RS and they were a perfect fit, but it requires removing your old lines and "building" replacements using their online builder. Then a wait to receive them means down time but may be worth the cost saving over imports. I used Spieglers, bought through Jerry at Pirateslair on my K1200RS and I'm very happy with the outcome.
Have you completed a full ABS module bleed? Very important to keep this unit in top condition with an annual bleed.
http://www.i-bmw.com/showpost.php?p=781417&postcount=7
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Old 10-24-2018, 05:55 AM
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Re: Brake action troublesome???

If you want the best aircraft spec hoses, these guys won't let you down:-

https://www.motorworks.co.uk/vlive/S...&search=SEARCH

. . and they sell a complete kit ready made for the individual bike model, and sell globally. Give them a call.
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Old 10-24-2018, 05:14 PM
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Re: Brake action troublesome???

I recently had to do an abs-ectomy on my 03 K1200GT. I had Spiegler make me custom lines for front and rear, but since the lower fork lines are the same with or without abs, i asked them for the specs on their stock 6 line ABS kit. Here are the specs:

Here are the specs for the ABS kit

Top line : 11.61 inches with a 002 fitting and a 410 fitting
ABS line : 14.96 inches with a 004 fitting and a 410 fitting
Left caliper line : 5.31 with a 019 fitting and a 710 fitting
Right caliper line : 6.10 inches with a 019 fitting and a 410 fitting
Rear MC to ABS unit : 11.02 inches with a 019 fitting and a 017 fitting
ABS unit to Rear caliper : 12.01 inches with a 002 fitting and a 410 fitting
This kit also comes with a billet 3 way manifold. (I believe the factory manifold is hard to the top line coming down)

Obviously, if you can get Spieglers, do. Their service and responsiveness was WAY above par. New custom lines were perfect...
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  #12  
Old 10-27-2018, 11:36 PM
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Re: Brake action troublesome???

Hi All, thanks for your help. Meantime brakes flushed, including servo/ABS system. Wanted to take the bike for a spin, but doesn't start. I can hear the brake system pressure up, the fuel system pressure up and then there is the tineiest click, no roar.... All the fuses in the fuse blocks are good. This is going to be an interesting bike....
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Old 10-28-2018, 12:54 AM
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Re: Brake action troublesome???

Sounds like a classic example of a flat battery. The starter relay has a cut out to prevent starting if the battery charge is too low to allow a successful start. Put a meter across the terminals to check battery voltage.
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  #14  
Old 10-28-2018, 01:04 AM
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Re: Brake action troublesome???

Hi, battery was 12.4V after trying. Got it on a charger now, but point appreciated. Might not have enough amps to give it a go. I assume I hear the starter relay clicking, but what holds it from turning over then?
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  #15  
Old 10-28-2018, 01:09 AM
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Re: Brake action troublesome???

12.4 is just about a dead battery. The real test is what voltage reads when you hit the starter. 9.5 is minimum. Double edged sword here, you can weld starter relay contacts if the battery is low. But easy money, your battery is shot.
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