929 brake fluid flushing - Honda Motorcycles - FireBlades.org
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post #1 of 8 Old 07-23-2008, 6:12 AM Thread Starter
 
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929 brake fluid flushing

The last two times I've flushed out the front brake fluid (last night and 2 months ago) I've opened the nipple, squeezed the brake lever and tightened up the nipple swiftly and then release the brake lever. It then takes 4 or 5 squeezes on the lever to get the firm feeling back again? Is that normal? I've had this bike from new and have done this loads of times but I don't recall having to pump the lever that many times before this year to get a firm feel again. Are they all like this and my memory is simply failing?

Cheers,

Mark
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post #2 of 8 Old 07-23-2008, 6:45 AM
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Re: 929 brake fluid flushing

Hmmm...doesn't sound too far off normal. When I'm bleeding fresh stuff through I don't bother pumping it up to get pressure. I just pump, open, close, release and repeat.
When I've finished flushing and am pumping the air out then I pump it up to pressure before cracking the nipple open.
If you replace your fluid with a different coloured one it's easier to see when the new stuff is coming through clear.
Using the same fluid it can be difficult.

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post #3 of 8 Old 07-23-2008, 6:56 AM Thread Starter
 
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Re: 929 brake fluid flushing

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Originally Posted by bladeracer View Post
Hmmm...doesn't sound too far off normal. When I'm bleeding fresh stuff through I don't bother pumping it up to get pressure. I just pump, open, close, release and repeat.
That's ok then, I was concerned I was looking at a failing master cylinder. I think I need to get another those non-returning bleed kits as they definitely make the job easier.
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Originally Posted by bladeracer View Post
When I've finished flushing and am pumping the air out then I pump it up to pressure before cracking the nipple open.
If you replace your fluid with a different coloured one it's easier to see when the new stuff is coming through clear.
Using the same fluid it can be difficult.
Good point although I find that if the dot 5.1 fluid is in there for more than a couple of months then it's darker then the new fluid so it's not too bad.

Thanks,

Mark
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post #4 of 8 Old 07-23-2008, 6:59 AM
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Re: 929 brake fluid flushing

I have used the non-return bleeders but I don't find them much good and would always bleed it by hand to finish anyway.
They're very useful if you're doing car brakes though :-)
I use Dot4 in everything.

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post #5 of 8 Old 07-23-2008, 7:09 AM Thread Starter
 
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Re: 929 brake fluid flushing

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Originally Posted by bladeracer View Post
I have used the non-return bleeders but I don't find them much good and would always bleed it by hand to finish anyway.
They're very useful if you're doing car brakes though :-)
They're good for flushing but yes, I'd bleed the air out by hand as you do. The thing I love is the gadget that attaches to the spare tyre and then screws on to the reservoir for cars. It simply pressurised the reservoir and provides a feed of fresh fluid so you just go round with a small bit of hose, a jar and a spanner and you can do the lot in 10 minutes - bliss
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I use Dot4 in everything.
Really? I must admit I only started using 5.1 because someone told me it was 'better' but I can't recall why and have never noticed any improvement. I may go back to 4 next time I run out as it's certainly cheaper.
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post #6 of 8 Old 07-23-2008, 8:33 AM
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Re: 929 brake fluid flushing

5.1 has a higher boiling point.

Understanding Brake Fluid - RPMnet.com tech articles - by AFCO racing

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post #7 of 8 Old 07-23-2008, 8:36 AM
 
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Re: 929 brake fluid flushing

I think the dot 5 doesn't attract moisture too.
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post #8 of 8 Old 07-23-2008, 8:50 AM
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Re: 929 brake fluid flushing

If you're boiling your brake fluid then the 5.1 might be of benefit. But fresh DOT4 is fine. I only rarely get fluid boiling and it's due to very worn discs, pads and/or fluid.
DOT5 doesn't attract moisture because it's silicone based but at the expense of the feedback you need for high quality braking.

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