Most e-bike maintenance advice focuses on the battery and the frame, and brakes get mentioned once and forgotten. That's backwards. An e-bike is heavier than a regular bicycle and often faster, so the brakes are doing more work on every ride — and unlike a cracked frame or a dead battery, worn brakes usually fail quietly, a little at a time, until a panic stop reveals the problem. This guide covers what kind of brakes are worth having, how to tell when pads need replacing, and what a basic seasonal check should include.
In this guide
- Hydraulic vs. mechanical disc brakes
- Signs your brake pads are worn
- Why brake pads aren't a warranty item
- A basic brake check routine
- DIY pad replacement vs. a bike shop
Hydraulic vs. mechanical disc brakes
Not all disc brakes are the same. Mechanical (cable) discs pull the brake pad toward the rotor with a steel cable, the same way old rim brakes worked, just aimed at a disc instead of the wheel rim. Hydraulic discs use sealed fluid lines instead of a cable, so the force from your fingers on the lever transfers through the fluid rather than through a cable that can stretch, fray or need periodic tension adjustment.
For any e-bike capable of 20+ mph, hydraulic disc brakes are worth insisting on over mechanical discs or rim brakes — they give stronger, more consistent stopping power in wet weather and over repeated use, and they don't lose stopping power gradually as a cable stretches the way mechanical discs can. On a bike like the Air Max, with a top assisted speed of 28 mph, that's exactly the kind of speed where brake quality stops being a minor spec on a comparison chart and starts being a safety one. If you're shopping for an e-bike and the brake type isn't listed clearly, it's worth asking directly rather than assuming.
| Type | How it works | Trade-off |
|---|---|---|
| Rim brake | Pads clamp directly on the wheel rim | Weakest in wet weather, rare on e-bikes above entry level |
| Mechanical disc | Steel cable pulls pad to rotor | Simple to service, but cable stretch gradually softens the lever feel |
| Hydraulic disc | Sealed fluid line transfers lever force to rotor | Strongest, most consistent feel; self-adjusts as pads wear |
Signs your brake pads are worn
Brake pads are a consumable part on every bike, e-bike or not — they're designed to wear down and get replaced, the same way tires do. There's no universal mileage number that applies to every rider, because pad wear depends on how much you ride, how hilly your routes are, how often you brake hard, and riding in wet or gritty conditions, which wears pads faster than dry pavement. Instead of watching an odometer, watch for these signs:
- Longer lever travel. If the brake lever pulls noticeably closer to the handlebar grip before the brakes bite than it used to, the pads have thinned and the system needs attention.
- Squealing or grinding. An occasional squeal in damp weather is normal. A persistent grinding or metallic scraping sound usually means the pad material has worn through to the backing plate, which can also damage the rotor.
- Reduced stopping power. If it takes longer or more lever force to stop at the same speed you're used to, don't wait for a wear indicator — that's already a functional problem.
- Visible pad thickness. On most disc brake calipers you can see the pad material between the caliper and the rotor. A pad worn down to a thin sliver, close to the metal backing, needs replacing before your next ride, not after.
Why brake pads aren't a warranty item
It's worth understanding upfront that brake pads, along with tires, tubes, chains, cables and grips, are treated as consumable wear items on e-bike warranties generally, not manufacturing-defect coverage. Mihogo USA's own 1-Year Limited Warranty covers manufacturing defects on six core components — frame, motor, battery, controller, display and charger — but explicitly excludes consumable and wear items like brake pads, since those wear out from normal use rather than failing due to a defect. That's standard across the industry, not something unique to one brand, and it's a useful thing to know before you assume a worn-out pad is a warranty claim. Budgeting for periodic pad replacement is simply part of owning any bike that stops well.
A basic brake check routine
You don't need a full workshop to stay ahead of brake wear. A simple routine, folded into the kind of seasonal maintenance habits covered in our carbon frame care guide, catches most problems early:
Every ride
- A quick squeeze of both levers before you roll away — they should feel firm, not spongy, and stop the wheel well before the lever reaches the grip.
Monthly
- Glance at pad thickness through the caliper if you can see it.
- Listen for new noises — grinding, clicking or a rubbing sound that wasn't there before.
- Wipe rotors clean if they've picked up road grime; a dirty rotor can make even healthy pads feel less effective.
Before a long ride
If you're prepping for a longer outing, brakes belong on the same pre-ride list as tire pressure and battery charge — see our long-ride readiness checklist for the fuller version. A worn pad that's merely annoying on a short commute becomes a real risk on a long descent later in the ride.
None of this requires buying anything from us — we don't sell brake pads or other parts, and a local bike shop is the right place to actually source and install replacement pads matched to your specific brakes. What we can tell you honestly is what to watch for and when it's time to get them checked.
DIY pad replacement vs. a bike shop
Swapping disc brake pads is a genuinely approachable repair on a mechanical disc system — it's mostly a matter of removing a retaining pin or bolt, sliding the old pads out, and fitting new ones sized for your caliper, using a basic tool kit. Hydraulic systems raise the difficulty: after a pad swap, hydraulic brakes typically need the pistons pushed back into the caliper correctly and the lever bled if air gets into the line, which is where a lot of first-time DIY jobs go wrong. If you're comfortable with basic bike tools and follow your specific brake manufacturer's instructions, a mechanical disc pad swap is reasonable to do yourself. For hydraulic brakes, or if you're not confident bleeding a line, it's worth paying a shop for the twenty minutes it takes rather than riding on brakes you're not sure about.
Riding conditions also change how often you'll be having this conversation. Wet roads, gritty winter streets and stop-and-go city riding all wear pad material faster than dry, open commutes, simply because more braking events happen per mile and more grit gets pulled into the caliper. If your commute or routes tend toward one of those conditions — see our guide to riding in rain and winter for the rest of what changes in bad weather — it's worth checking pad thickness a little more often than the monthly glance described above, rather than waiting for a scheduled check to catch a problem that crept up faster than usual.
Want the fuller picture before you buy or maintain any e-bike? Our buyer's checklist covers brakes alongside the other specs worth checking, and the Air Max review breaks down exactly what ships standard, hydraulic disc brakes included. See the Air Max ($999, two chargers included).
Frequently asked questions
How do I know if my e-bike's brake pads need replacing?
Watch for longer lever travel before the brakes bite, squealing or grinding noise, reduced stopping power at speeds you're used to, or pad material worn down to a thin sliver when you look through the caliper. Any of these means it's time to have them checked.
Are brake pads covered under an e-bike warranty?
Generally no. Brake pads, like tires, tubes, chains, cables and grips, are treated as consumable wear items rather than manufacturing defects. Mihogo USA's 1-year warranty, for example, covers six core components (frame, motor, battery, controller, display, charger) but excludes wear items like brake pads.
Is it worth paying more for hydraulic disc brakes over mechanical?
For any e-bike capable of 20+ mph, yes. Hydraulic discs give stronger, more consistent stopping power in wet weather and don't gradually lose feel the way a mechanical disc's cable can stretch over time.
How often should I check my e-bike's brakes?
A quick lever squeeze before every ride, a closer look at pad thickness and noise monthly, and a full check before any long ride — the same cadence as the seasonal checks recommended for the rest of the bike.