FZ6 ABS Hydraulic Unit Assy Issues - Yamaha FZ6 Forums - FZ6 Motorcycle Forum
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post #1 of 2 (permalink) Old 08-19-2020, 07:31 PM Thread Starter
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FZ6 ABS Hydraulic Unit Assy Issues

Hello! I have FZ6 S2 with ABS. I recently bought it with low mileage. Everything was working including brakes and ABS. Took it to dealership to do full service and after changing the brake fluid dealer said that ABS Hydraulic Unit Assy and rear brakes are blocked. Dealer said that most likely because brake fluid was not changed at regular intervals and now after attempt to change it, it is impossible to bleed (get out all air) from the system and most likely some valve has stuck in ABS Hydraulic Unit and it has to be replaced. Dealer claims that it is common issue with FZ6. Needless to say ABS Hydraulic Unit cost a fortune. What I would want to know is:
1. Is it actually a common problem for FZ6?
2. Is it possible to repair ABS Unit in such cases?

Thank you for any help!
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post #2 of 2 (permalink) Old 11-07-2020, 05:37 PM
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I think this situation is very weird considering IT WAS WORKING before, so ... i would suspect the dealership honesty.

Now going to the chase onto the problem itself... the ABS unit is a regular DC Motor that spins to change the pressure on the wheels and some electro mechanical valves actuated by solenoids controlled by the ABS ECU.

Now, what can be wrong? i think basically if you never change the fluid, the fluid passages valves that are controlled by the solenoid coild be clogged, i would take the ABS unit apart, sumerge it in some kind of solvent, and they with a air compressor, clean the passages.

By the other hand, if the problem is not the fluid passages but something electrical, you can always reparir the DC motor on it, rewind it, etc, i think is very hard to find a ABS unit that cannot be repaired.

I know A LOT of FZ6s, i have a S2 ABS my self, and i have never experienced problems and dont know anyone with ABS unit problems. So... to say that is a VERY COMMON PROBLEM... i think is a over statement.

It could fail... yes, off course, anything could fail, but i dont think is common and i think it could be a easy fix.

I would disassemble entirely, sumerge it in some form of paint thinner and they with pressure air on all passages, try to remove any clog.
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