Bleeding Avids

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  • Bleeding Avids
  • shedfull
    Member

    I bled my Elixir 5s at the weekend and I’ve got the process sorted so that it takes about 10 minutes per wheel. I just lent the syringes to a mate for him to do his and wrote him some instructions. I thought I’d paste them on here, too, in the hope that they help anyone who’s struggled with this in the past.

    Firstly, put in new pads if you’re considering swapping them as it’s best to get that done first. Next, with the wheel out, squeeze the brakes until, without squeezing the lever, the pads are just skimming the surface of the disc if the disc were in there – sounds daft but you have to overextend the pads on a lever squeeze to get them to return to a spot just the right distance apart. Put the wheel back in and check that it’s not draggy – if it is, use a big, flat screwdriver to gently prise the pads apart a little. Put the wheel back in to start bleeding (if you haven’t already) and get the front of the bike as high up as you can but so you can still turn the steering to vary the angle of the lever/master cylinder. A workstand is invaluable for this.

    I fill one syringe full of brake fluid (put the lid on the brake fluid tin!!!!!) and snap shut the clip that squashes onto the pipe then, with the syringe pointing upwards, I carefully pull down the plunger a bit. Air comes out of solution and collects on the sides of the syringe and a bit of vigorous tapping of the syringe with a screwdriver will make the bubbles float upwards.

    Try and get as much air out as you can then undo the clip and, with a rag round the brass screw end of the syringe and the pipe pointing skywards, push the plunger up to force out the air. Clip off the pipe. Remove the bleed screw from the caliper and attach the full syringe. The empty one attaches to the lever end.

    Now it’s time to start forcing new fluid into the system. Don’t forget to unclip the clip on the syringe pipe before you start – it’s messy if you forget! Steadily squeeze the lower syringe to push fluid through to the top syringe. As you’re doing this, do the following:

    1. Tap the caliper and brake lines with a screwdriver handle to get the bubbles moving upwards
    2. Regularly flick the lever a little to let the air through the bleed hole in the master cylinder
    3. Keep rotating the steering so that the lever is uppermost then the line to the syringe is vertical with the syringe uppermost. It lets more air out of the master cylinder.

    At no point disconnect the syringes or pull fluid back into them. It means you have to start again.

    Keep going until you’ve got just a centimetre of fluid in the lower syringe then use the clip to close the line on the lower syringe. Now close the clip on the upper syringe.

    Next, with a rag wrapped around the master cylinder and the bleed hole pointing as upward as you can get it, quickly unscrew the syringe and screw in the bleed screw. Repeat with the caliper end (remembering the rag) and test your brakes for a fairly solid feeling.

    Junk the fluid out of the upper syringe (it burns well so is good for starting fires/barbecues!), refill the lower (getting the air out using the clip-up-and-pull-plunger process) and start on the other brake.

    I hope that helps.

    Ian

    Premier Icon Garry_Lager
    Subscriber

    Ty Ian – I need to do some elixirs, just waiting on the bleed kit.
    I needed to put new pads in recently and there was no way the new ones would go in with enough space for the disk, even with the pistons pressed back as far as I could get them.
    Quite strange (and **** annoying), as if there was too much fluid in the system, yet the brakes have been fine up to now (from the bike being new a few months back).

    Each to their own, but you really need to bleed them with the pads out and the bleed block in.

    robhughes
    Member

    Yep…Bleed block in.Sets to pistons right.

    shedfull
    Member

    Why? You bleed with worn pads and a bleed block and the distance between piston at bleeding and piston when you’ve pumped it out to press pads against disk is bloody miles.

    I wonder where motorcycle and car bleed blocks can be bought from?

    robhughes
    Member

    Prevents overfill…

    Junkyard
    Member

    bleed with the blocks in using the pads they will be overfilled and you wont be able to push the pistons all the way back in when you want to change pads – there is a reason the avid kit comes with them – also avoids risk of contamination
    never put a screwdriver on your pads and then lever them – unless you have removed the bleed nipple but then you will [probably]get fluid on your pads

    Apart from that pretty much what I do

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