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Thread: ST1300 - Getting all the air out of the brake system

  1. #1
    John Heath jfheath's Avatar
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    ST1300 - Getting all the air out of the brake system

    Below is a link to an article that I wrote a while ago for our biking club, specifically for the ST1300.

    Click the image link --> Click image for larger version. 

Name:	ST1300 - Removing Air from Brakes.pdf 
Views:	97 
Size:	1.27 MB 
ID:	185826

    Full step by step diagrams of the brake system, showing the parts in relation to their height above the ground, along with notes and likely locations of air traps, and some pitfalls to avoid. I hope it will be useful to members.

    The link has been updated to reflect the correction to the sequence that appears in later versions of the Honda Workshop Manual, and also to clarify the order of steps 1/2 and steps 5/6 for those who prefer to use the pictures.


    [Edit]Dave was having problems downloading this pdf. If you are in the same boat, PM me with an email address, I'll email it to you. [/Edit]

    A reduced version of the sequence of images is included in post #11.
    Last edited by jfheath; 08-06-2017 at 07:31 AM. Reason: Minor changes & typos to the pdf file

  2. #2
    Dave.David's Avatar
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    Re: Going on an Air Hunt

    Quote Originally Posted by jfheath View Post
    Brakes - Getting Rid of All of the Air

    Below is a link to an article that I wrote a while ago for our biking club, specifically for the ST1300.

    Click the link --> Attachment 180023


    Full step by step diagrams of the brake system, showing the parts in relation to their height above the ground, along with notes and likely locations of air traps, and some pitfalls to avoid. I hope it will be useful to members.
    Thank you for this information. Well done and clear, love the pictures.

  3. #3

    Re: ST1300 - Getting all the air out of the brake system

    wow, awesome information! Thanks!

  4. #4
    QuickBlue MajorTom's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    Thanks for the effort it took to make this article John. While I've done a brake bleed/fluid change on my STeed a couple of times, the last with a hand vacuum pump, your article makes it much clearer what's going on during the process and provides lots of helpful tips to make sure it goes right. For example, I'll be wrapping the bleed valves with teflon tape and using a Motion Pro check valve next time.

    At the end of the article you say, "A frequent check on the SMC ‘feel’ is essential to verify that this line remains air free." Sorry, but I don't understand your meaning here. How do you check/detect the SMC 'feel'?
    Barry


    Keeping the blue side up.

  5. #5
    Dave.David's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    What is SMC?

  6. #6
    Site Supporter Soontobeone's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    Secondary Master Cylinder = SMC
    SMC.pdf
    Last edited by Soontobeone; 02-20-2017 at 03:24 PM.

  7. #7
    Dave.David's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    Quote Originally Posted by Soontobeone View Post
    Secondary Master Cylinder = SMC
    SMC.pdf
    Thank you

  8. #8
    John Heath
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    Re: ST1300 - Getting all the air out of the brake system

    Quote Originally Posted by MajorTom View Post
    At the end of the article you say, "A frequent check on the SMC ‘feel’ is essential to verify that this line remains air free." Sorry, but I don't understand your meaning here. How do you check/detect the SMC 'feel'?
    Cheers for the comment MajorTom.

    Normally when you are braking, you cannot tell that the SMC is operating correctly. One way to make sure is after riding for a while, come to a stop without touching front or rear brakes, and check the temperature of your rear disc rotor, go for a quick spin and stop reasonably quickly using only the front brakes. Jump off and quickly check the temperature of the rear disc again. If the rear disc is hotter than it was, then your SMC is applying the rear brakes as it should. (nb the disc surface should be very hot. You can sense this by putting your fingers near to the surface. I would advise against touching the surface)

    As for 'feel', you can rock the front left calliper by hand - it will push forward towards the fork, but the amount of movement is very slight. I measured it the other day following a chat with DoubleOhNine who was having problems. I was surprised to find that the movement was only about 1mm (UK ST1300A9, 3 years old) - it seems to be much more than that, so i double checked my measuring. The point is, it should feel quite tight and the movement is only slight.

    If it is as much as my previous ST1300 which was having problems shown in the video on Post #7 link here, then that is too much and you need to start suspecting air in the system, worn master cylinder seals, worn out SMC bore, or a leak.
    Last edited by jfheath; 02-21-2017 at 09:51 PM.

  9. #9
    QuickBlue MajorTom's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    Thanks John, that clears it up.

  10. #10
    Dave.David's Avatar
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    Re: ST1300 - Getting all the air out of the brake system

    With the bike up on the center stand and me laying down next to it I could use my foot to spin the back tire and my hand to shove the left caliper forward. I'm not saying this is a perfect test but it did stop the tire.

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