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

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  #1  
Old 07-12-2018, 05:50 AM
Fiddle-Mike Fiddle-Mike is offline
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Servo test

Hey yíall. Iím working either my first BMW and donít know a lot about them. This bike has brakes issues.... should I be hearing the servo when I grab the brake lever?
Whatís an easy test to be sure the servo is working? Thanks!!
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  #2  
Old 07-12-2018, 11:20 AM
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Re: Servo test

Mike what year is your bike? The servo assisted brakes in the US models started in 2002 and ended in 2007, and if I am correct in 2008 the ABS units were no longer servo assisted, ending a not very useful experiment. If your bike is 2008 or newer you won't have servos, thus nothing to hear.
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Old 07-12-2018, 06:32 PM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

Itís an 03😩
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  #4  
Old 07-13-2018, 02:11 AM
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Re: Servo test

Mike, your '03 K1200RS or GT does have the "iABS" servo assisted brake system. If all is working correctly when you turn on the key, without starting the engine, the brake system goes through its self check, and two warning lights will illuminate, that is the red triangle light, and the "brake failure" light. After a couple of seconds the red triangle will extinguish if all is well. The brake failure light will continue to flash. Then start the bike and after you ride off a few yards later the brake failure light should extinguish. If either light continues to flash beyond the few seconds then there is a problem with the ABS unit.

Sometimes the problem is easily remedied, a weak battery will trigger the lights. Low fluid in the rear reservoir (the one under the rear plastic panel on the rider's right) will also trigger a warning light.

Beyond that, it could be that the ABS unit has failed, and that's bad news, because a stock replacement part itself is a couple of grand, and as far as I know, no one in the US is rebuilding them. I understand there is a shop in Germany that is offering rebuilt units for about $1000. There is also ways to bypass the ABS unit, do a search in this tech forum chances are you'll stumble across a few threads on the topic.

Good luck.
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Old 07-13-2018, 09:22 AM
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Re: Servo test

You should hear the servos briefly on the self-test when you turn on the ignition.Briefly at about 2 seconds after ignition on.

Self test completes after a yard on my bike or one rotation of the wheels.

Brake lever/pedal switches?Normally closed on them iABS systems.Actuating either breaks the contact and signals the unit/turns the servos on.

Procedure is "do not hold the brakes" when you turn on the ignition.Under "Starting on gradients" in the Rider's manual.That prevents the self test from completing and the servos won't work yet altough if you release the brakes under way self test will run and servos/ABS will then function normally.

So a bad switch?Quick test on my bike and the brake warning light (left) keeps on fast flash.Normally goes fast for a few seconds then slows down.
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Old 07-13-2018, 07:02 PM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

So itís not a fuel pump I hear when I turn the key on... itís the servo....
That gives me some hope 😁😁😁
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Old 07-13-2018, 07:29 PM
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Re: Servo test

with the key on, and engine off, or on, if you pull the front brake lever, or step on the rear brake lever, you should hear the whine of the servo motors.
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Old 07-14-2018, 04:20 AM
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Re: Servo test

Well, yes you will hear the pump prime at ignition on. If you flick the kill switch to off, turn the ignition on, and then put the kill switch back to run you will hear the pump prime the fuel rail. And to expand on CJ's reply, if you gently step on the rear pedal you will/should hear one motor whine, and if you pull the front lever you will/should hear two motors each with a slightly different pitch. The front brake is linked with the rear, hence to motors whining, but the rear brake is rear only.
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Old 07-14-2018, 08:59 AM
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Re: Servo test

Quote:
Originally Posted by Fiddle-Mike
So itís not a fuel pump I hear when I turn the key on... itís the servo....
That gives me some hope 😁😁😁

Fuel pump first briefly as you switch on the ignition to prime the fuel system then it shuts off until you start the bike.At about the 2 sec mark the servos will whine for a second or so.The system does test the servos by running the motors briefly as part of the self test.

Yes easy to confuse the twos.But not on my bike.....I replaced the old noisy BMW/VDO fuel pump with a Bosch 69222.So quiet that I have to put my ear to the tank to hear it.
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Benelli 50cc at 14
Yamaha RD200 at 16
Yamaha RD350 at 17
Honda CB750F at 18
Honda V45 Sabre at 24
85 BMW K100RS at 28 (Very nice and sorely missed)
90 BMW R100GS at 34 (Too slow, too cranky)
2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
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  #10  
Old 07-14-2018, 06:23 PM
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Re: Servo test

Hey Pierre, I got lucky and was gifted some spare parts including a pump. When I bench tested my original pump while trying to trace a start issue, it sounded very very sick, so in went the new to me spare. So I'm stuck with a noisy oem pump but a least I know if it's working every time I fire up
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Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 170,000km
1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride
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Old 07-14-2018, 08:16 PM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

Thatís the answers I was looking for. Turn the key on and hear the fuel pump.
And it does just like you said when you flick the kill switch. I get nothing though when
I engage either brake. Would improper bleeding of the unit kill the servos?
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Old 07-14-2018, 08:26 PM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

The bike was in perfect condition until the last guy tried to flush the brake fluid
Now the servos apparently wonít work. I guess Iím trying to figure out what he did wrong
He claimed he couldnít ring all the bleeder valves so he could not did the ones he could see and I know he did not do it in the correct order😩
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  #13  
Old 07-14-2018, 09:03 PM
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Re: Servo test

The correct bleed sequence is very important as I guess you already know. Would improper sequence kill it? Dunno, but a proper bleed sequence won't hurt. If you haven't seen the sticky for this process, see Gary Hollinger's thread on how to. It's a must when undertaking this task. The difficult to get to bleeders can be reached modifying a 7mm socket. You will need to cut down the drive end of the socket so that overall length is 20mm. Then you need to drill out the centre with a 10mm drill bit to accommodate the plastic drain hose, but only drill down to 5mm from the tip of the socket. Then grind two flat surfaces on the outside of the socket to take a 14mm open spanner. Find some plastic tube that will be a tight fit over the bleeder. Fit the modified socket over the bleeder making sure you can fit your 14mm wrench to it, then push the bleed hose through the socket and onto the bleeder. Use a small pair of needle nose pliers to help. I soften the end of the bleed hose in hot water and practice a few times on F3 to stretch the plastic a bit so it is easier to push on to the awkward bleeders.
With R2 you may need to remove the screw holding the front control circuit bleeder adaptor so you can gently move it out of there way a little bit. When you have finished bleeding, use the pliers to firmly grip the drain tube and wiggle off. Keep a firm squeeze on the drain tube as it will prevent the old fluid from dripping everywhere.
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Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 170,000km
1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride
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Old 07-14-2018, 09:07 PM
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Re: Servo test

__________________
Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 170,000km
1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride
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Old 07-14-2018, 09:10 PM
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Re: Servo test

Here are a few pics of what I did.





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Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 170,000km
1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride
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cws
  #16  
Old 07-14-2018, 10:32 PM
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Re: Servo test

When you apply the brakes on a iABS system the servos start when the brake switches click open.But they also start from MC pressure.

Hold brake switch closed and apply the brakes and the servos will start on a normally functioning system once the system gets pressurized.

Now that some of the info is finally coming out....that probably should have been on the first post.It does save time and guesses.Yeah.....POs.

Question? Do you have a reasonably firm pedal and lever?I'd start with the BMW reverse bleed procedure and the big syringue aka the "bubble free injector",as I suspect the PO may have run the reservoirs low.Procedure is in the BMW service manual under brake lines replacement and such.No need for the servos just yet when reverse bleeding the wheel circuits.

Then proceed with modulator bleeds as per the posted procedure.Again servos not required for that part.

If they come back to life?Bleed the wheel circuits with the servos going as per the procedure and consider yourself lucky.
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Benelli 50cc at 14
Yamaha RD200 at 16
Yamaha RD350 at 17
Honda CB750F at 18
Honda V45 Sabre at 24
85 BMW K100RS at 28 (Very nice and sorely missed)
90 BMW R100GS at 34 (Too slow, too cranky)
2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
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Old 07-14-2018, 10:37 PM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

If I go through it and bleed the system properly is there any hope
That the servos will start working?
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  #18  
Old 07-14-2018, 11:03 PM
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Re: Servo test

Quote:
Originally Posted by Fiddle-Mike
If I go through it and bleed the system properly is there any hope
That the servos will start working?

Have absolutely no idea Certainly worth doing anyway as it needs to be done regardless
__________________
Current rides:
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 170,000km
1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride
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  #19  
Old 07-15-2018, 10:02 AM
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Re: Servo test

Quote:
Originally Posted by Fiddle-Mike
If I go through it and bleed the system properly is there any hope
That the servos will start working?

Hope is that pressure is re-established in the system.iABS does monitor internal pressure at self-test and won't turn on the servos if low pressure in either front or rear circuits.

That's a fault read by the iABS brain."Low pressure in front/rear or both circuits".Fault = Residual braking only aka NO servos.

The sequence of the flashing lights will give some indications as to what the fault(s) may be but that has limitations.Better is the GS911.
__________________
Benelli 50cc at 14
Yamaha RD200 at 16
Yamaha RD350 at 17
Honda CB750F at 18
Honda V45 Sabre at 24
85 BMW K100RS at 28 (Very nice and sorely missed)
90 BMW R100GS at 34 (Too slow, too cranky)
2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
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Old 07-15-2018, 10:28 AM
Fiddle-Mike Fiddle-Mike is offline
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Re: Servo test

Hope is restored 😂😂😂
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