Brake bleeding and fluid change on CBR600 F2/F3 models

RideCBR.com Forums Specific CBR Model Discussions 600F3 Forum Brake bleeding and fluid change on CBR600 F2/F3 models

This topic contains 6 replies, has 5 voices, and was last updated by Profile photo of kerosene kerosene 3 years, 3 months ago.

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  • #6735
    Profile photo of juliet
    juliet
    Registered Member
    Training Wheels
    Points: 20

    Manufacturers reccommend changing this every one to two years and with good reason, brake fluid is hygroscopic and absorbs moisture from the air … this will affect braking performance and the water content will corrode master and slave cylinders internally over time.

    Changing the brake fluid is the same procedure as bleeding the brakes only more of it.

    First you need to get the bike parked up with the master cylinder reservoir roughly level.

    I found with the 600F3 (sames as F2) that you need to have the bars turned to the right first so you can crack off the two screws holding the reservoir cover in place.

    The screen is in the way otherwise. Undo and remove them then turn the bars to full left lock.

    I also found by using an old dumb bell weight on the side stand as shown it put the reservoir just about level.

    Once you have undone the top alloy cover you will see a plastic diaphragm cover, remove this and the rubber diaphram beneath it.

    Get several old rags or towels and cover your handlebars, instrument cluster, and wheels. Brake fluid is very caustic, and will quickly ruin paint and crack plastic if it’s spilled.

    If you do spill some, even a small amount, immediately flush with copious amounts of soapy water.

    Use a NEW bottle of DOT 4 brake fluid as shown, I got mine from my local Halfords store … DOT 3, 4 and 5.1 are compatible, 5.0 is silicone based and not compatible.

    Keep it simple and use the recommended DOT 4.

    Remove the rubber cap on the bleeder nipple, located on the caliper. Attach a piece of clear tubing to the bleeder nipple on the caliper, and place the other end in a waste container. An old bottle will do. Or use a one man brake bleeder kit as I have done as shown, the tube has a simple one way valve at the end that goes in the bottle so air cannot be drawn back in.

    You need to place a spanner 8mm. over the bleed nipple first and seat it over the hex part of the nipple then attach the rubber bleeding hose.

    Open the bleeder nipple about ½ turn.

    Squeeze the brake lever all the way in. DO NOT release it yet.

    Close the bleeder nipple. Then release the brake lever.

    Repeat these steps enough times to replace the volume of fluid in the reservoir about two or three times.
    Once you have opened the nipple if you are changing fluid as opposed to just bleeding out some air then you can leave it open and just pump the brake lever in and out repeatedly until all fluid is nearly expelled but not dropped below the level of the hole in the bottom of the reservoir.

    Keep a close eye on the level in the reservoir, so that it doesn’t run dry!!

    If it does, it won’t hurt anything, but you’ll have introduced air into the system that you’ll need to bleed out.
    Like moisture, air in the lines will decrease the braking power. Add fluid to the reservoir as necessary.

    As shown in the picture below if you don’t let the level drop below the hole in the bottonm of the reservoir you will not introduce air into the system, when it gets this low simply fill the reservoir back up with new fluid and flush through again.

    While bleeding, observe the fluid coming out of the clear tubing. At first, you will probably see air bubbles coming out.
    Keep bleeding until bubble-free fluid is coming out.

    A point to note is that you often get air introduced between the bleed tube and nipple union so air bubbles coming out are not from the system itself, be aware of this.

    When there is no more air in the tubing, and you have clear new fluid coming through hold the lever back against the bar and snugly close the bleeder nipple and carefully remove the tubing, and replace the rubber cap.

    Repeat the above procedure for the left hand side caliper.

    Finally, top off the reservoir to the correct level and replace the cap.

    Pump the brake lever until it is firm.

    It is exactly the same procedure for the rear brake and as shown in the pics you can see the position of the rear brake reservoir and the nipple and tube in place ready for bleeding. Obviously this time you are pumping up and down on the rear brake pedal to expel the old fluid and air. Keep pumping on the pedal by hand until it is nearly empty but not below the level of the hole in the bottom of the reservoir. Once you have flushed through two or three times I did three then top up and tighten the bleed nipple with the pedal in a down position. This is so you do not pull air back in by releasing the pedal before you tighten the nipple.
    Top up the fluid to the line and pump the pedal to get it hard again.

    Note also the rubber diaphragm once you remove the cap. In this case the rear reservoir has a screw cap.
    Always grip the reservoir when undoung the caps on these so as not to unduly stress their mount points.

    Another thing to mention is cleanliness here. It was a bit breezy outside so I did this in my garage, you do not want bits and particles blowing into your reservoir when you have the cap off it, keep the area clean and before you remove the cap wipe around the reservoir to remove any dust, dirt or grime.

    Also do not use old bottles of opened brake fluid you may have had lying around a while since brake fluid is hygroscopic and absorbs moisture from the air. Buy a new bottle and use it up, I did both my bikes.

    Well, hope that helps and encourages some of you to check the condition of this vital fluid!!

    Jules

    #6737
    Profile photo of fahren
    fahren
    Registered Member
    RideCBR Newbie
    Points: 255

    Nice one :) did mine over the winter period. Warped my front disks on a 200 mile charity run, it was a lot of slow riding in the rain and all that water and road dirt caused havoc with the front brakes ( that and the brakes were due a good service)…following week when i went out on my bike the front end was juddering under braking and lever was pulsing…i stripped the front calipers off and discovered only 1 of the pistons was moving freely on the right side brake:( so i overhauled both callipers and changed the fluid (which was a dark brown colour)…braking was better but still had the judder so i removed the disks and found they were warped 3mls out..had them straightened at Motorliner for £50, there still not perfect but will do till i order a new set, couldnt afford new ones at Christmas for obvious reasons lol.

    I was told when bleeding them up you should do the left caliper first then the right is this correct? or does it not matter?

    On another matter how often do any of you change your fork oil?

    #7719
    Profile photo of shoichirohonda
    shoichirohonda
    Registered Member
    RideCBR Regular
    Points: 3,894

    Nice write up, thanks.

    #8450
    Profile photo of juliet
    juliet
    Registered Member
    Training Wheels
    Points: 20

    Paul:

    I was told when bleeding them up you should do the left caliper first then the right is this correct? or does it not matter?

    On another matter how often do any of you change your fork oil?


    I guess if you want to be pedantic you can do the left first, but honestly, I’ve never had an issue what side I start to bleed first … it might be different if bleed the brakes dry but my method of changing the fluid involves not letting the level get below the hole in the master cylinder reservoir and just pumping enough new fluid through until it all comes out clean :)

    Fork oil should be changed more frequently than I bet any of us actually do it..lol

    Jules

    #59678
    Profile photo of kerosene
    kerosene
    Registered Member
    RideCBR Regular
    Points: 2,666

    @Jules – Bringing this back from the dead, any way you can bring it to life with pics?

    #59693
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    jules
    Registered Member
    RideCBR Guru
    Points: 28,558

    It’s alive!!

    When the power of love overcomes the love of power, then the world will know peace...

    #60008
    Profile photo of kerosene
    kerosene
    Registered Member
    RideCBR Regular
    Points: 2,666

    Excellent @Jules, thanks :) will hopefully come in handy

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