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  #1  
Old 05-30-2018, 01:16 PM
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Brake Dilemma

2005 BMW K1200s

18000 Km

Brake flush done 2016 by dealer, everything else checked out OK according to the dealer.

now the dilemma.....

I normally do not use the rear brake foot pedal, I almost always use the front brake lever to come to a stop.

The other day, I just barley touched the rear brake pedal and I got the red triangle on the dash...


I can replicate this over and over again, and it's only when I hit the rear brake pedal, does not even have to be a hard push, it's actually not even braking the bike, so there is almost no resistance or pad pressure on the rear rotor.

If I just use the front lever, the red triangle does not come on, braking seems to be fine and bike will stop no problem.

So the question is

rear brake switch is faulty ?
low brake fluid in the rear brake reservoir ?
rear brake pads are needing replacement ?
rear tail light causing the error ?
is it the ABS unit going to the crapper ?
does it need a brake fluid flush ?, yes it's now 2 years since the last one, and about 5000 Km put on the bike since that last flush.

Above are the suggestions made by the dealership, on what might be the cause

Every once in a while, I can hear a slight high pitch sound, when I am backing out of the garage, down the driveway and I am applying the front brake lever to slow me down as I am going between my parked cars, and have to take it slow so as not to bump into them, and every so often at a stop light, if I squeeze and release the front brake lever, I can get the same sort of high pitch squeal.

I do not have a GS911, so I cannot run diagnostics on my own

I can check the fluids, and remove the rear caliper and check for pad thickness

Not sure on how to check the rear brake switch

And if it turn out to be pads, any suggestions on what pads to use, stock BMW from dealer or something aftermarket, I do not race and or drive aggressively but I am not slow either, I do like to hit the throttle once in a while, and then need to brake almost as hard....



Just trying to get some ideas on what I should do and or not do.


Thanks.


.
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  #2  
Old 05-30-2018, 02:39 PM
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Re: Brake Dilemma

well heck the fluid level is easy to check. AS its only the rear I would suspect whatever ABS sensor might be attached to the rear wheel if any.
My caiper pins stuck last year what a pisser no warning light though.

Oh and pads are likely not a culprit how could they be?

Oh and do this. start bike let it fully cycle through its checks then drive to remove ABS check. Stop with front lever then with bike motionless engage rear pedal as lightly as can be in hopes of getting the ABS warning. If it does it static whell and wheel in motion what would that mean?
The dvd manual is pretty useless for this.

You are going to pull the caliper and check the pads eh? It might surprise you. Hey lube your pins regardless.
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  #3  
Old 05-30-2018, 03:58 PM
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Re: Brake Dilemma

Turn the ignition on
Wait until selfcheck is complete

Now, slightly step on the rear brake and see if the brake light turns on and if the ABS Pump start whining.

The microswitch controls the brake light directly through the ZFE.
If the brake light turns on, but there is no sound from the ABS Servo pump, then you will need to read out the computer.

A low brake fluid level can be read from the dealer without opening panels.
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  #4  
Old 05-30-2018, 08:44 PM
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Re: Brake Dilemma

Quote:
Originally Posted by Patrique83
Turn the ignition on
Wait until selfcheck is complete

Now, slightly step on the rear brake and see if the brake light turns on and if the ABS Pump start whining.

The microswitch controls the brake light directly through the ZFE.
If the brake light turns on, but there is no sound from the ABS Servo pump, then you will need to read out the computer.

A low brake fluid level can be read from the dealer without opening panels.

Ignition on, self check complete

Slight push and brake light turns on

Push a bit more and I can hear the ABS pump whirring

Same happens if I use the front brake lever

Rear brake fluid is at correct level in the reservoir

When I did this the first time, light came on, I shut off and tried again, no red triangle light came on.

Stumped now...

Still going to checks pads, just in case, nothing better to do, as itís gonna rain for the next 4 days, so they say...

.
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  #5  
Old 05-31-2018, 01:10 AM
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Re: Brake Dilemma

How fresh is your battery? A weak battery can cause issues with servo ABS braking systems in these bikes.
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  #6  
Old 05-31-2018, 01:31 AM
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Re: Brake Dilemma

Battery should not be an issue, 2 years old, and when not riding itís on a the BMW tender

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  #7  
Old 05-31-2018, 05:13 AM
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Re: Brake Dilemma

On your second try you said that the light turned on and the ABS red warning triangle came on? No ABS whining?

If the light turns on and there is no sound from the ABS pump then you are in for a ABS servo change....

......although, and this is highly unlikely..... there is an adjustment for the microswitch which needs to be correct for the system to function properly.
The switch needs to activate before there is (a set amount) of pressure going to the ABS Servo. If the switch activates too late then the ABS will throw a fault too.

But i assume you havent touched the switch....

I can only suggest to you, to buy the K-DCAN Adapter + OBD2 to 10 pin round cable.... a $45 investment and you can diagnose all your problems from home.
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  #8  
Old 05-31-2018, 11:05 AM
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Re: Brake Dilemma

Quote:
Originally Posted by Patrique83
I can only suggest to you, to buy the K-DCAN Adapter + OBD2 to 10 pin round cable.... a $45 investment and you can diagnose all your problems from home.

Do you have a link or two where these can be sourced?
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  #9  
Old 05-31-2018, 12:32 PM
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Re: Brake Dilemma

Quote:
Originally Posted by Patrique83
On your second try you said that the light turned on and the ABS red warning triangle came on? No ABS whining?

If the light turns on and there is no sound from the ABS pump then you are in for a ABS servo change....

......although, and this is highly unlikely..... there is an adjustment for the microswitch which needs to be correct for the system to function properly.
The switch needs to activate before there is (a set amount) of pressure going to the ABS Servo. If the switch activates too late then the ABS will throw a fault too.

But i assume you havent touched the switch....

I can only suggest to you, to buy the K-DCAN Adapter + OBD2 to 10 pin round cable.... a $45 investment and you can diagnose all your problems from home.




First attempt:



Ignition on, self check complete

Slight push and brake light turns on

Push a bit more and I can hear the ABS pump whirring

Same happens if I use the front brake lever

Rear brake fluid is at correct level in the reservoir



Red triangle showed up


----------------------


Second attempt, Turned bike off and did the following:


Ignition on, self check complete

Slight push and brake light turns on

Push a bit more and I can hear the ABS pump whirring

Same happens if I use the front brake lever

Rear brake fluid is at correct level in the reservoir



This time the red triangle light did not come on, no matter how many times I pressed on either brake lever, hand and or foot.




And as mentioned can you provide links to the items you are talking about please....


Thanks
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  #10  
Old 05-31-2018, 11:09 PM
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Re: Brake Dilemma

Hmmm...... the switch is working then.
Diagnosing an error is not possible without reading out the module.
It could be alot of things.... trigger point, over/under pressure in the circuits, low brake fluid level (the ABS has 2 internal fluid reservoirs), bad battery....


10 pin round adapter
https://rover.ebay.com/rover/0/0/0?m...2F311958471234

K+DCAN Interface.
https://rover.ebay.com/rover/0/0/0?m...2F292070247061
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  #11  
Old 05-31-2018, 11:20 PM
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Re: Brake Dilemma

Quote:
Originally Posted by Patrique83
Hmmm...... the switch is working then.
Diagnosing an error is not possible without reading out the module.
It could be alot of things.... trigger point, over/under pressure in the circuits, low brake fluid level (the ABS has 2 internal fluid reservoirs), bad battery....


10 pin round adapter
https://rover.ebay.com/rover/0/0/0?m...2F311958471234

K+DCAN Interface.
https://rover.ebay.com/rover/0/0/0?m...2F292070247061

Appreciate the feedback....

I just might have to take it to the dealership, don’t like riding around, if there is a potential problem with the braking system

I will check out your links and look at getting those items...

Is there any link for any software that will be required ?

Cheers

.
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Old 05-31-2018, 11:43 PM
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Re: Brake Dilemma

Usually, the software comes with the K+DCAN interface.

If not, i can help you out with it.
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  #13  
Old 06-01-2018, 12:39 AM
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Re: Brake Dilemma

Ok...

I thought there was some specific software for the bikes that is needed

.
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  #14  
Old 06-01-2018, 04:20 AM
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Re: Brake Dilemma

Here is my thread in regards to hooking up the bike to the computer....

http://www.i-bmw.com/showthread.php?t=60992
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Old 06-01-2018, 05:47 AM
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Re: Brake Dilemma

Quote:
Originally Posted by GateKeeper
Ok...

I thought there was some specific software for the bikes that is needed

.
It is a specific software, but thats the one you get included.

if that doesent work patrique83 will sort you out. He helped me with my install and first hook up of the bike.
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  #16  
Old 06-06-2018, 10:56 PM
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Re: Brake Dilemma

So while I wait for cables and odb reader, and or go to dealer....

The front brake reservoir is full, rear is full as well, well at the correct level, what and how do I check the level in the ABS pump?, or reservoir? ,or what ever itís called, do I need to take apart a whole lot of stuff, to see and top up...

Or do I just take it to dealer and have the brake service done, itís been 2 years from the previous one done ????

Thanks

.
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  #17  
Old 06-07-2018, 04:45 AM
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Re: Brake Dilemma

The internal ABS reservoir has 2 "fluid level sensors".....
If the reservoirs are low and the pump starts drawing fluid it might trigger the level sensor.

If it isn't the level sensor, then it could be one of the two "pressure sensors" that primes the system.

A readout of the system will tell you exactly what it is.

If its pressure sensors..... oh oh. Big money.
If its low level then its just a matter of topping up and flushing the pressure and control circuit (which should be done anyway by now....2 years)
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  #18  
Old 06-07-2018, 10:17 AM
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Re: Brake Dilemma

Thanks for the reply....


seems it will have to go to the dealer no matter what shows up on the readers, as it's time for the brake flush anyways....


hopefully it's just a simple brake flush and refill, and no more issues....


Time to make an appointment with the dealership.....


.
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