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Rear brake problems

K

kenbo

Member
Member
Good morning, I have a 2011 concours that has no rear brakes at all. I have good front brake operation, but rear pedal goes all the way thru travel with no restriction or stopping power. Any ideas where to start I do not want to just throw parts at it. Hoping to get involved in trouble shooting this weekend .
 
What's the background story that led to this situation?

forum.concours.org

Sudden rear brake failure

Hi Everyone, wondering if this situation is familiar to anyone and what to do about it... I decided it was time replace my front and rear brake fluid. Bled the front out no problem then moved to the rear when the problem begain. For context the rear brake has been working just fine. The...
forum.concours.org forum.concours.org
 
bIke sat for almost a year between weather and covid that did a job on my health. finely draged bike out of garage to ride and warm up to change oil and noticed no rear brake pedal. Remembered year before that pedal seamed low, only thing done was lowered foot pegs and oil changes.
 
UPDATE Rebuilt rear master cylinder and flushed lines with brake fluid and still have no brake pedal does anybody have any knowledge of internal ABS unit valving etc. thanks in advance.
 
Yes, l do. How much crud did you find in the m/cyl?

Does the circuit seem to bleed/flush ok?
 
Did the rear brake ever work correctly? I had a 2012, the rear brake never worked as I thought it should. I associated it to the ABS system. Never got it to work correctly.
If I used the front brake first, the rear brake worked OK. If I tried to use the rear brake first, it had to be pumped to get any braking action. Not a good thing.
Sorry, I do not have any solutions
 
Bleed system after repair and never seemed to build any pressure, also vac bleed system with no difference, bleed both rear bleeders. N.G. did find some junk in master cylinder but not horrible. I am going to try aftermarket master this week but feel that there may be a problem in ABS unit in eather dump or isolator circuit. is this unit serviceable. NOTE I am an automotive technician with 48 years experience.
 
I just rebuilt the caliper with all new seals. I also replaced the seals of the master cylinder. I had no brake pressure until cranking the hand vacuum bleeder and depressing the lever many times. It can be a stubborn system to get air out. The speed bleeders helped keep air from backing into the system. She now has awesome braking feel.
 
l repair these gen 1 ABS units.Here's the link to my ebay item.

www.ebay.com.au

Kawasaki 1400GTR ZG Concours 14 07-09 ABS unit pump 16082-0023 $250 cash back | eBay

HINT: use a cable tie to hold the front lever partly pulled in so that the fluid does not drain out of the circuit while the ABS unit is off. The front can be a pain to bleed once air gets in there.
www.ebay.com.au

I'm an 'oldtimer' these days and repair these units. If interested l can do a deal via PM.
 
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I Am going to try to power flush system first as i have no problem with fronts and then if no good i will contact you By the way in the states the price for a new unit is 1100. USD
 
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