Joyor S10-S-Z · Brakes
Brake lever feels soft or goes to the bar
A spongy lever on hydraulic brakes usually means air in the line or worn pads. This is a safety fix.
Is this your problem?
- Lever pulls much further than before
- Lever feels spongy, or firmer after pumping it a few times
- Brake grips weakly
Likely causes
Look at the pads (see the worn-pads guide). Look for any wet or oily spot on the brake parts.
What you need
Tools
Example photoA Torx set (T10–T30 covers most scooters). Brake disc bolts are often Torx; check the head shape before you buy.
Photo: JaredMcKenzie, CC0, resized
Example photoA metric set, roughly 2 mm to 8 mm. Long-arm keys reach the recessed bolts on the stem and deck.
Photo: Leon Brooks, Public domain, resized
Example photoKeep skin oil off the brake parts, and brake fluid off your skin.
Photo: unknown, Public domain, resized
Example photoA clean microfibre cloth or paper towel. Never one that has had oil or polish on it for brake work.
Photo: Polyesterchen, Public domain, resized
Example photo90% or stronger. Cleans oil off brake discs and dries without leaving anything behind. Not the same as rubbing alcohol with added oils.
Photo: João Carlos Ávila, CC BY-SA 4.0, resizedParts
Example photoOnly the type written on your brake (lever reservoir cap or caliper): DOT fluid or mineral oil. The two never mix; the wrong one ruins the seals. The photo shows a DOT fluid as an example.
Photo: Just a Man, CC BY 4.0, resized
Example photoPads are shaped to the caliper. Order ones listed for the Joyor S10-S-Z, or take an old pad to a shop to match the shape.
Photo: PetarM, CC BY-SA 3.0, resizedPhotos show the kind of tool or part, not a specific product. We don’t sell anything and get nothing from any shop.
Step by step
Tap a step when it’s done to keep your place.
- Check the pads first
Worn pads make the lever travel further. If they are thin, replace them and test again before doing anything else.
- Look for leaks
Wipe the caliper, hose joints and lever clean with a dry cloth, squeeze the lever hard a few times and look again. Any fresh wet oil means a leak: that is a shop job.
- Find out which fluid your brake uses
It is written on the lever reservoir cap or on the caliper: DOT (a number like DOT 4) or mineral oil. Joyor does not publish this for the S10-S-Z, so read it off your brake.
DOT fluid and mineral oil must never be mixed. The wrong one destroys the seals.
- Bleed the brake, or have it bled
Bleeding pushes fresh fluid through to drive the air out. It needs a bleed kit made for your brake’s fluid and fittings. If you have never done it, this is the time to let a shop do it: it is cheap, quick for them, and your stopping depends on it.
- Test standing still, then slowly
The lever should feel firm and stop at the same point every time. Then test at walking speed.
Stay safe
- Do not ride with a lever that reaches the handlebar.
- Brake fluid (DOT) damages paint and skin. Wear gloves, wipe spills immediately.
- Never get fluid or grease on the pads or disc. Oily pads have to be replaced.
When to take it to a shop
Any leak, any doubt about the fluid type, and bleeding if you have not done it before.