https://www.youtube.com/watch?v=tzlOIhcBkak
On occasion, you may need to swap your brake hoses over. One thing to bear in mind though, if you’re not confident with hydraulics, definitely speak to your local bike shop. We’re using Shimano brakes because they’re are right and left specific, unlike Sram or Avid brakes, where you can swap the whole lever over. This is a quick and easy process just to swap your hoses over, if you’re careful about it, you won’t need to do a full brake bleed. To swap the hoses, you’re gonna need to an 8mm open ended spanner, you’ll need a 2 1/2mm allen key or hex wrench, you need a 4mm allen key or hex wrench, you need the Shimano bleeding funnel with the plunger, you need some mineral fluid, a rag and some kind of cleaner or isopropyl alcohol. Importantly, you want to make sure that if any oil does drip from the brake levers in the process, it can’t get on your front disc rotor. So firstly level off the brake levers so they’re horizontal, this will be clear later. You then need to remove the rubber boot on the lever, that’s covering the hose connector. Now get your 8mm open ended spanner and undo this hose connector. Then your next step is to remove the hose from the lever. When you do this, it’s give it a firm tug, to release the olive which is set into the lever. As you pull it out, you might lose a bit of fluid but be as delicate as you can. For this stage, it’s vital to not touch the brake lever. If you operate the brake lever in anyway, you’re gonna lose fluid and that means you’re gonna have to do a full brake bleed. So when my front brake lever is separated from the hose, repeat the same process with the back brake lever, then reconnect those brake hoses into the levers in the reverse process of taking the hoses out the levers. Make sure that the olive sits home, you’ll feel it slightly click into place. Then tighten your hose connector back up with your 8mm open ended spanner and replace the rubber boot. We’re gonna take the Shimano funnel bleeding tool and a 2 1/2mm allen key. As you remove the 2 1/2mm allen bolt. With the funnel in place on the top of the lever and a small amount of oil inside there, your lever is actually open so air can travel out. Gently squeeze the lever a few times and you may or may not see some air bubbles rise to the surface. While the brake lever is pulled to the bar, gently tap the hose as well, all the way along to the actual lever, just to help any air bubbles travel along, that maybe in there. At the end of the process, you need to put the plug into the funnel and carefully remove the funnel from the lever. Now that I’ve put the 2 1/2mm top cap bolt back in place, we just to check everything works. Make sure you give the brake levers and handlebar area, a good wipe down with some brake cleaner or some isopropyl alcohol, just to make sure any residue of oil is removed. You’re at the end of task now, don’t forget to just reset your brake levers to a preferred angle, good to go and hit the trails.
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