E-Bike Parts

Brake Levers

Mechanical and hydraulic levers, including e-bike levers with motor cut-off sensors.

E-bike brake levers do a job regular levers do not: most include a small sensor that tells the controller to cut motor power the instant you brake. When that sensor fails or the lever is bent in a fall, you can end up with a bike that will not accelerate at all (sensor stuck on) or one that keeps pushing while you brake (sensor not working). Replacing the lever is easy; choosing one that matches both your brakes and your controller takes a little homework.

First decide what kind of brake you have. Mechanical disc and rim brakes use a cable lever, and the lever's pull ratio must suit the brake: long-pull levers for V-brakes and most mechanical discs, short-pull for road-style calipers. Hydraulic systems use a lever with a built-in master cylinder, and those are sold as part of a complete brake (lever, hose and caliper) or as a bare lever to be bled into your existing hose, which means matching the brand's hose fittings and fluid type.

Then there is the cutoff sensor. Most cutoff levers use a two-pin waterproof plug, but the sensor can be a magnetic reed switch or a hall sensor, and controllers expect either a normally-open or normally-closed signal; the wrong type leaves you with no power or no cutoff. Match your existing lever's connector and, where possible, buy the same type your bike shipped with. Mismatched electrical parts can damage a controller or battery; if you are unsure what your bike uses, an E-Bike Assessment is the safe next step.

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Brake Levers

Hydraulic Brake Cut-Off Sensor with Magnet (generic)

When you convert a bike with hydraulic brakes, you usually do not want to swap out the levers. The fix is a stick-on cut-off sensor: a small hall sensor that glues to the lever body with a magnet on the lever blade, so the signal is sent as the blade moves. Sold in pairs, typically with a 2-pin Julet waterproof plug or bare wires. Installation is simple but placement matters — the magnet must sit within a few millimeters of the sensor at rest and move away when you pull. A little patience with the alignment makes the difference.

Best for: Mid-drive and hub conversions on bikes with hydraulic brakes · Riders who want to keep their existing levers · Replacing a failed sensor on a bike that uses this style

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Sold on Amazon

Brake Levers

Mechanical Brake Levers with Motor Cut-Off Sensor, Pair (generic)

Cut-off brake levers are the standard way hub-motor kits stop the motor the instant you brake: a small switch in the lever sends a signal to the controller when you pull. Generic pairs come with either a 2-pin Julet waterproof plug or a small SM plug and work with mechanical disc and rim brakes (V-brake pull on most). They are a cheap safety upgrade for kits that shipped without cut-offs and a straightforward replacement when a lever switch fails. If your bike has hydraulic brakes, you want a sensor add-on or hydraulic levers instead.

Best for: Hub-motor conversion kits with mechanical brakes · Replacing a failed cut-off lever on a kit bike · Adding motor cut-off to a kit that came without it

View details & where to buy

Sold on Amazon

How to choose brake levers

Mechanical or hydraulic

Match your brake type. A hydraulic lever only works with its own brand's hose, olives and fluid; a mechanical lever must match your brake's cable pull.

Cutoff sensor type and connector

Check the pin count and plug style on your existing lever and whether your controller wants normally-open or normally-closed. If the bike maker sells the lever, that is the safest match.

Left, right or pair

Levers are handed; most are sold in pairs. Some bikes route the front brake to the right lever, so check which side controls which brake before ordering a single.

Clamp and reach

Standard bars are 22.2mm at the clamp. Adjustable reach helps riders with small hands and lets you set the bite point comfortably.

Integrated shifter or display clearance

Make sure the new lever body leaves room for your shifter, throttle and display clamp on the bar.

Compatibility notes

Cutoff sensor signal type (normally-open versus normally-closed) and plug must match your controller; a lever that fits physically can still give no power or no cutoff. Confirm on your bike.
Hydraulic levers are brand- and often model-specific for hose fittings and fluid; do not mix mineral oil and DOT systems.
Cable pull ratio must match the brake type: long-pull for V-brakes and most mechanical discs, short-pull for road calipers.
Mismatched electrical parts can damage a controller or battery. If unsure, an E-Bike Assessment is the safe next step.

Installation considerations

Remove the battery before unplugging cutoff sensors.
For mechanical levers, transfer the cable, set the barrel adjuster mid-range, and adjust so the pads engage with about a third of the lever travel.
Hydraulic lever swaps generally require cutting the hose, fitting a new olive and barb, and bleeding; if that is new to you, a shop is worth it.
Test the cutoff with the wheel off the ground: throttle or pedal assist should stop the instant you pull either lever.

Maintenance tips

Check cutoff plugs for corrosion and seat them fully; intermittent no-power is often a loose sensor plug.
Lubricate mechanical lever pivots lightly once a season.
Make sure the lever returns fully; a sticky lever can hold the cutoff on and leave the bike dead.

Frequently asked questions

Why will my e-bike not accelerate after I changed the brake lever?

The new lever's cutoff sensor is likely the opposite type (normally-open versus normally-closed) from what your controller expects, or its plug is not seated. Unplug one lever at a time to test, and match the original sensor type.

Can I use regular bike levers on an e-bike?

You can for braking, but you lose the motor cutoff, which is a real safety feature on a bike that may be under power when you brake. Cutoff levers are inexpensive; use them.

Do hydraulic e-bike levers have cutoffs?

Many do, either built in or as a small sensor clipped to the lever body with a magnet. Replacement sensors are often available separately from the lever.

My bike has hydraulic brakes but the sensor plug is 2-pin. Is that normal?

Yes; most cutoff sensors use a two-pin waterproof plug regardless of brake type. The sensor type (open or closed) still has to match the controller.

Which lever controls the front brake?

In the US the left lever usually controls the front brake, but some bikes and conversion builds are reversed. Check yours before buying a single lever.