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#767760 - 03/24/12 05:37 PM Re: Understanding the ABS system on the R1150RT [Re: PAS]  
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philbytx Offline
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philbytx  Offline
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Kerrville, TX
If you find the rear brakes too touchy, I recommend going for a ride and ONLY use your rear brakes for stopping. This will give you a goodly amount of body memory learning and will help you finesse the brakes a lot better.

Of course, you do this on quiet roads and use your front if you DO need it LOL!


Phil C.
2003 R1150RT "DaRTh"
2014 Jeep Grand Cherokee Overland 4x4 Diesel "Smiffy"
2011 Kia Optima EX "Meosjin Chalo"
#767775 - 03/24/12 06:50 PM Re: Understanding the ABS system on the R1150RT [Re: philbytx]  
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Gaston Offline
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Gaston  Offline
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SW Washington state
Originally Posted By: philbytx
If you find the rear brakes too touchy, I recommend going for a ride and ONLY use your rear brakes for stopping.

Phil,

How do you do this on a pre-2006 1150RT?


Gaston
Battle Ground, WA
2002 Titan Silver BMW 1150RT
#767783 - 03/24/12 07:22 PM Re: Understanding the ABS system on the R1150RT [Re: Gaston]  
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philbytx Offline
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philbytx  Offline
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Kerrville, TX
The iABS is a LINKED system. If you put sufficient pressure on the rear brake pedal it will bring in the fronts! Try it and you will see what I mean.

BMW changed the iABS system rear to front bias in early 2002 (IIRC!) as the early system brake pedal was VERY touchy. You will find that on the later systems you have some pedal travel where it just applies rear brake pressure BEFORE it brings in the front circuits.

It also helps to only use the rears in low speed manouevres BUT if you are a little heavy on the rear brake pedal, the fronts will be applied as well and if your front wheel is at an angle you could end up dumping the bike.


Phil C.
2003 R1150RT "DaRTh"
2014 Jeep Grand Cherokee Overland 4x4 Diesel "Smiffy"
2011 Kia Optima EX "Meosjin Chalo"
#767793 - 03/24/12 08:28 PM Re: Understanding the ABS system on the R1150RT [Re: twelve]  
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dirtrider Offline
The Oracle
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Ohio
Afternoons Phil

The I-ABS controller was changed on the 1150RT around VIN ZE 87455. That also involved using a larger diameter rear master cylinder piston size 14.29mm vs the earlier 13mm size. The M/C size increase was mainly to allow the new revised ABS controller to have enough reserve braking from the rear pedal but that also had the side effect of taming down the rear brake apply a bit. The new ABS controller also has a different calibration that allowed the rear servo to shut down with an idling engine & sitting still as a power saving function.


D.R. ___
Sent from my rotory dial wall phone!
#767802 - 03/24/12 10:11 PM Re: Understanding the ABS system on the R1150RT [Re: dirtrider]  
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philbytx Offline
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I knew there was a more technical explanation around somewhere wink

Thanks DR thumbsup

Last edited by philbytx; 03/24/12 10:14 PM.

Phil C.
2003 R1150RT "DaRTh"
2014 Jeep Grand Cherokee Overland 4x4 Diesel "Smiffy"
2011 Kia Optima EX "Meosjin Chalo"
#767821 - 03/25/12 01:39 AM Re: Understanding the ABS system on the R1150RT [Re: PAS]  
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MAT2CHI Offline
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MAT2CHI  Offline
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Marin County - California
Originally Posted By: PAS
Morning D.R.
It's the touchy whizzy front brake that I dont care for


When I bought my new '04 R1150RT the front brake was great. After one of the services it started acting all grabby. On my 6,000 mile service I had the brakes flushed and now it's back to normal and the grabbiness is gone. Have you flushed your brakes lately?


2008 SM 610
2006 CRF450X
2004 R1150RT
1989 FXST
#767823 - 03/25/12 01:53 AM Re: Understanding the ABS system on the R1150RT [Re: MAT2CHI]  
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Boulder Dave Offline
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Originally Posted By: MAT2CHI
Originally Posted By: PAS
Morning D.R.
It's the touchy whizzy front brake that I dont care for


When I bought my new '04 R1150RT the front brake was great. After one of the services it started acting all grabby. On my 6,000 mile service I had the brakes flushed and now it's back to normal and the grabbiness is gone. Have you flushed your brakes lately?


I noticed the same effect after a flush. Brakes are very powerful, but that initial grab is gone.

#767824 - 03/25/12 01:55 AM Re: Understanding the ABS system on the R1150RT [Re: philbytx]  
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Gaston Offline
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Gaston  Offline
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SW Washington state
Originally Posted By: philbytx
BMW changed the iABS system rear to front bias in early 2002 (IIRC!) as the early system brake pedal was VERY touchy. You will find that on the later systems you have some pedal travel where it just applies rear brake pressure BEFORE it brings in the front circuits.


Mine was built in April of 2002, and any touch of the foot pedal seems to activate both the front and rear brakes. At least I have not been able to feel the rear brake only being applied...


Gaston
Battle Ground, WA
2002 Titan Silver BMW 1150RT
#767825 - 03/25/12 02:02 AM Re: Understanding the ABS system on the R1150RT [Re: dirtrider]  
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Gaston Offline
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Gaston  Offline
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SW Washington state
Originally Posted By: dirtrider
The I-ABS controller was changed on the 1150RT around VIN ZE 87455. That also involved using a larger diameter rear master cylinder piston size 14.29mm vs the earlier 13mm size. The M/C size increase was mainly to allow the new revised ABS controller to have enough reserve braking from the rear pedal but that also had the side effect of taming down the rear brake apply a bit. The new ABS controller also has a different calibration that allowed the rear servo to shut down with an idling engine & sitting still as a power saving function.
My VIN is higher numerically than ZE 87455, therefore built later. So, I should have a tamed down rear brake?


Gaston
Battle Ground, WA
2002 Titan Silver BMW 1150RT
#767828 - 03/25/12 02:11 AM Re: Understanding the ABS system on the R1150RT [Re: Gaston]  
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philbytx Offline
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philbytx  Offline
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Kerrville, TX
Yes.....!


Phil C.
2003 R1150RT "DaRTh"
2014 Jeep Grand Cherokee Overland 4x4 Diesel "Smiffy"
2011 Kia Optima EX "Meosjin Chalo"
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