Replacing brake fluid

[EazyDuz]

my bike needs this doing, is it difficult? If done wrong can it seize the piston? Thanks
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[Efes123]

Not used it, but seen this recommended;

https://www.ebay.co.uk/itm/350134651318?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Will probably get one and try it myself at some point.
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[supZ]

err isnt that for a car??

changing your brake fluid on your bike is pretty easy.

a Mityvac is pretty foolproof but not cheap.

all i use is a bit of hose that'll fit over the bleed nipple taped to a syringe.

i suck out the old fluid from the res. then 'reverse bleed' (push fluid up from the bleed nipple on the caliper) both calipers, suck out the fluid again, top it up and job done.

if i think i havent done it right i'll then bleed it normally with a jam jar, some spare fluid and a hose with a 1 way valve on.

do a search, there are plenty of guides about and plenty of tools to help you on the various bike spares sites.

you cant really do any harm to anything, the worst that'll happen is you get air in the system and the brakes done work. but all you need to do is bleed it properly and you'll be fine.
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CBR954RR - Daily toy
CBR600RR - Trackbike

[Efes123]

[robbieguy2003]

It's reasonably easy to do, I bled my front and back when I switched to braided lines.

If you're doing it, and you've got an ok toolkit, it'd be worth trying to clean up the pistons, even in the seats, just using a toothbrush and removing the gunk off the top of them will help somewhat.

As for the bleeding, the tool on the link from Efes looks quite good. I had a one way valve type thing that connected to the bleed nipples.

I basically done the following (from memory);

1) opened bottom bleed nipples, bled system dry
2) removed calipers, cleaned pistons, checked rings/seals, replaced pads
3) connected new lines
4) refilled system slowly from the top
5) old school method of pump level, hold lever on, open nipple, close nipple, rinse and repeat until good feel.

Section 5 is the trick. I'd do your best to make sure the system is as dry as possible (i.e. all fluid out). If you mix the old with the new, then you'll never get a good change. If you mix them at all, you'll end up with a boiling point of somewhere between the dry and wet boiling points of your new mix, and possibly worse depending on how much it manages to mix with your old fluid.

It's a relatively easy job, but it's obviously an important component, so if you're not 100% confident afterwards then just have someone check it over for you.
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Current Bikes: Honda CBR 600RR - '07, Suzuki GSX1250 FA ST '11
Old Bikes: Suzuki Intruder 125 LC - '2001, Honda CBR 600F - '92, Honda CBR 600RR - '03

[harscot]

[bunglehaze]

I bought a large 100ml syringe and tube from ebay, you may find you have to bang the end of the tube in boiling water to soften u and then wrestle it to stretch over the bleed nipple but it is a one shot deal.

Attach the syringe in fully closed, open your fluid reservoir and top up, open bleed nipple and gently pump the lever until you get to fluid low line, add more fluid and repeat until what you see in the syringe is cleaner.

As you do this you may need to pump and hold lever, close off bleed nipple, detach hose and squirt out the old fluid for disposal, attach the hose again and open the nipple.

easy job to do on your own with a few minutes, zero mess and removes all your nadgery air bubbles that may otherwise be trapped.

https://www.ebay.co.uk/itm/Large-Syringe-Hydroponics-100ml-80cm-Handy-Tube-/270964996297?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item3f16c5b8c9
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[Deckx]

replacing fluid should be a piece of piss once you don't get air in the system.... get some correct diameter rubber tube for the caliper bleed nipples and connect to the top of an empty water/coke bottle, open bleed nipples/pump brake lever slowly whilst topping up the reservoir.. go through a few reservoirs full just to make sure the system is full of fresh fluid and job done... just be careful not get air in the system as you have to go all the pump/bleed saga... which can take a fcuking age

[EazyDuz]

Seems fairly easy, can it be done without the tubing? I have nitro RC car tubing, would that fit?
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