has caused agitation of the fluid by shaking, over pumping or just bad practice, you'll get micro bubbles.
Just bleed the system as normal but slowly and deliberately, gravity is your friend here, so is a good vacuum bleeder with experience and skill. Brakes aren't DIY if you don't know what you're doing, many think they do until they get on a bike with proper bled brakes.
Quote from: Gnasher on 07 July 2020, 10:49:34 amhas caused agitation of the fluid by shaking, over pumping or just bad practice, you'll get micro bubbles.Contextually I don't grasp how or why would someone would do this, the ABS unit would be bolted to the bike. But with regard to over-pumping, how exactly..?Quote from: Gnasher on 07 July 2020, 10:49:34 amJust bleed the system as normal but slowly and deliberately, gravity is your friend here, so is a good vacuum bleeder with experience and skill. Brakes aren't DIY if you don't know what you're doing, many think they do until they get on a bike with proper bled brakes.I have one of those, but either I didn't take enough time bleeding the brakes or need to understand exactly how and where I was using it incorrectly.I assume your referring to ABS-based bracking systems? as non-ABS is DIY imho and should well within the scope of most competent home mechanics.And regarding mechanics that say they know how to bleed an ABS systems, how do we tell they actually do know and aren't like in my 2x instances where they didnt.
cable-tie the brake lever back to the bar for 2 evenings.
If your brakes are spongy after they've been worked on by a professional who you've paid, take the bike back and give him/them an opportunity to correct the work. If they refuse demand you money back, don't go trying to sort it yourself.
As Ive mentioned, been there done that. And in the end, there was no choice - I had to do it myself.
I don't understand, if you paid for someone to bleed you brakes and they were spongy, why was there no choice?
Quote from: Gnasher on 07 July 2020, 02:59:38 pmI don't understand, if you paid for someone to bleed you brakes and they were spongy, why was there no choice?In both instances the bike was my only form of transport, so it needed to be working, hence why I ended up fixing it myself. And had I not being able to fix it myself, it would have gone back for said shop/s to do the job.And only because it was brought up a few posts ago, as bleeding the brakes was only part of the work being done. I did get a reduction in the bill due to the brakes being spongy in both instances. But as the cable-tie method work both times and has always worked in the past, I will continue to plan ahead when working on a brake systems so I can use said method as a backup plan.Back on topic, lets wait and see how Bikebud gets on with his bike.
What I find very puzzling, is you went somewhere else and they did they exactly the same. It's a matter for you mate but something is very wrong here, one getting it wrong but two? Chances are there's something else at fault here. I would in all seriousness suggest you get your system properly inspected either you've been extremely unlucky or there's another issue,spongy brakes will not correct themselves and will only get worse over time, depending on how you ride and the way ABS works, it can speed up the process. What you've not said is, were they spongy before the bike went in for whatever it went in for, service I assume. Or did they came out spongy after they'd worked on it? Brake bleeding/fluid change isn't a annual task just inspection, on a GSF it's replace every 24mths, is the fluid past 24mths? Personally if that was my bike it would have gone back within minutes of riding the bike and I'd have insisted they were re-bled, as the bike was given back to you in an unsafe manner.
I bought a 2012 FZ1 S ABS a few weeks ago. I'm loving the bike, but not very impressed with the brakes.
I've done the cable tie method and it has certainly made an improvement to the brakes. I pumped and tied the lever for about 10 hours, and noticed that it got a bit firmer, and did it again for about 48 hrs, and the lever is much firmer now, I got a more instant response and better feel, and the lever doesn't pull all the way in. It seems the mechanic who serviced the bike before i bought it, did a terrible job bleeding it.