You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
I have done it, sucessfully, several times, but it's such a faff and takes me so long that I normally pay some one else to do it. Due to my poor organisation, someone else has an 8 week waiting list. So I'm going to have to get my hands (also the floor, work bench, half the tool box and probably my hair) dirty again. Any pro tips from STW will be greatly appreciated.
Also does anyone know the backing plate colours for sintered and organic - I've got one red and one dirty gold set?
I find them really straightforward.
Get the reservoir on the lever level, hold it properly still, workstand, vice, whatever.
Remove cap and diaphragm.
Ring spanner on the bleed nipple. Also rag if you don't want fluid everywhere.
Open bleed nipple, squeeze lever, close nipple, release nipple. Repeat many times with pouring new fluid into reservoir when it gets low.
Brim reservoir with fluid, diaphragm back on,cap back on, job done.
.
Best tip is slow and steady is often fastest. Don't rush.
Rag keeps caliper end clean. Use a syringe to top up lever if your pouring isn't great.
Make sure the bleed nipple is at the highest point on the caliper. Often on rear brakes they are not...
Few taps of the caliper with something hard and plastic just before the last pump and bleed can release some trapped air
I thought I was going to have to watch a youtube video but andrewh pretty much summed it up.
Also, thanks for the reminder about the caliper bleed point.
Gold is usually sintered, red probably organic. Bleed as above but I put a bit of plastic tubing on nipple to catch fluid as I push it through.
Watch the videos on the Hope web site
After filing, bleeding, topping up etc, refit the lids then loosen the clamp and move the master cylinder to the down position. Give it a little tap, a shoogle then return it to the upright position, open and top it back up again. Its been suggested that air can get trapped in the master cylinder due to the dual diaphragm design*.
I've had the tech 2 and evo and hated both. It's problem seems to stem from the dual design. Something about it just never seemed to work well enough to make the system maintenance free in comparison to other Hope brakes, and you were always needing to re bleed.
I would think that this was the reason Hope dropped it in favour of the single lid.
I've found of a number of sets bought 2nds that had the lid threads near stripped, like people were trying to tighten the lids down harder and harder so believe that air is somehow getting in via the lower underside lid.
I bleed my hopes in reverse..res cap off suck out some fluid ...then attach a syringe to the bleed nipple open and pump the fluid that way...keep going till the fluid is clear..simples
I’m with Cheekyget on this one. Though with the current calliper design a little suck on the calliper end once all the oil is nice and new might be worthwhile given it’s a good shape for the bubbles getting trapped near the bleed nipple otherwise.
Wind out the BPA and lever throw adjusters first.
Tried both the top down and bottom up (syringe) methods over the years and former is easier and less messy.
I use a bit of tube into a pot off the bleed nipple to catch the old fluid - with a bit of tissue wrapped in case of dribbles.
Once bled, cap on, levers vertically down, tap reservoir and pull lever a couple of times, back to horizontal cap off, top up fluid. This bit's a faff as you feel like you've already finished but works well to get last of the air out.
Centralise calipers and pads on disk - amazing difference to power/effectiveness of bleed.
Bleed them however you want, as long as you get the oil in and all the air out. You can vacuum bleed, pressure bleed, manually pump, gravity bleed or push up with a syringe etc, whatever suits.
May need to remove the caliper to make the bleed nipple the highest point, can also move it around to "roll" any trapped air bubbles out. Adjust lever angle to release any trapped air bubbles
Hope sell bleed caps and a bleed funnel which makes things easier (they also sell a pressure bleeder, but that is probably overkill for most people. The funnel gives you a decent reservoir so you are not constantly having to top up the master cylinder, or catches the fluid if you use a syringe to push up.
It took me an hour to do just the front and I haven't had a test ride. I put newspaper on the floor, so that's clean and I don't need a hair wash.
Thanks for the tips. I did watch this
but it did't tell me anything you lot hadn't.
https://www.hopetech.com/how-to-videos/
https://www.youtube.com/watch?v=btaw2vx0SAQ
syringe on the caliper and blast fluid out of the reservoir. I get it all over the floor, handlebars, ceiling, me, inside the oven, in the car, everywhere.
But, it's really fast and has never failed me. Just get ready to wash the bike with water and a little soap as DOT fluid is super soluble in water, so washes off easy.
Just did a reverse bleed on a Tech4 lever.
Oh my that was easy.
Suspiciously easy, but riding round it seems to have worked nicely.
The bleed kits from hope really make a difference to time taken and effort. Comes with a speed hose connector for the caliper bleed nipple too which helps reduce spillage.
https://www.wiggle.co.uk/hope-easy-brake-bleed-kit
Comes with a speed hose connector for the caliper bleed nipple too which helps reduce spillage.
I can attest to that, in fact its probably the best thing Hope has come up with for a while.
I've bled a great number or their brakes over the years and trying to get the tube to stay on the nipple and not fall off while doing the open-close movement is just great.
Comes in two sizes too so you can use the system on the older large nipple you find on C2,O2,DH4 and early M4.
I’ve found of a number of sets bought 2nds that had the lid threads near stripped, like people were trying to tighten the lids down harder and harder so believe that air is somehow getting in via the lower underside lid.
Ah the old "it's leaking so I'll horse it down, oh it's leaking more better tighten it harder" approach 🙄
Yeah that was pretty much the conclusion i came to as well. I'm glad they dropped that design and went with the single lid one thats certainly stood the test of time.
Mine are okay, front is good but back has never been brilliant, will try your technique. You have also reminded me to get quick connectors.
I did the rear in 20 minutes today but I did have my lad opening and closing the bleed nipple whilst I pumped and filled. I'll do it myself again next year. Thanks again to all who commented.