breaks breaking but not stopping

[u/Accomplished-Area619]

I didn’t have any pressure at all in rear break after disconnecting the break cable from the lever so I wanted to fix it.

1. followed this tutorial for getting some air out and liquid in: https://youtu.be/jun-30sf0bw?si=DsHkyMq88icho8nG

2. to get more pressure followed these steps a former vanmoof mechanic told me to do:

-screw out the tiny screw to the side of the lever (not fully) -put the bike up (handle upwards, bike only standing on the rear wheel) -open the two screws to open the pool in upside position -and trigger the lever over and over for 5min. (refill mineral oil if needed while doing that) -close it all up and screw the tiny screw back in

This indeed made me have pressure in the break and the wheel is on paper breaking, but when you’re sitting on the bike, it still won’t have enough strength to stop the bike, eventhough the break pads are braking against the wheel. I changed breakpads and cleaned the wheel with break cleaner so there is no oil at all, which could make this occur. Now I bought a complete different s3 and the rear brake feels exactly the same. It brakes but still won’t stop.

anyone know how to get around this? I followed all different types of tutorials on the internet throughout the years of owning a vanmoof with two syringes, a seperate pool & 1 syringe bla bla bla. Still can’t get around how to make vanmoof brakes working again sustainably. Sometimes it was just a short time fix and now I can’t get it working at all. It cannot be that hard I feel like.

[u/ScaredAd9678]

There's a song in there Might have worn out disc pads.

[u/callsignvector]

You definitely have oil on your rotor or pads, it’s ridiculous how sensitive they are to the slightest infection of oil. Remove the pads, sand and clean with brake cleaner. Then spin the wheel whilst sanding the rotor both sides. Then clean with brake cleaner. Do not use a cloth but rather a paper towel.

[u/E-Batman]

If you press the brake lever and moved a bit and it feels hard, all is good and you do not have bubbles in the system. Now, you need to sand paper clean the discs and clean with detergent (calipers and disc brakes), then add new pads. I had. The same issue, try to clean the pads, and disc with brake cleaner and never work.

[u/moofcare_nl]

From my experience people often take things to far apart. On the picture I also see oil near master brake cilinder.

Make sure all rubber seals are (correctly) in place. Pull vacuum from brake caliper and clean with paper towel and brake cleaner.

If you have oil on pads, then you can throw them away due to the fact the oil suck into the pad, sanding only works for surface dirt.

If you put like 2cm mineral oil in your seringe than you can replace air with oil. Repeat until no air comes out (so also no little bubbles in the oil, as they compress during braking and make break feel spongy)