When you're sorting through bicycle drivetrain brakes components, the brake set itself often becomes the final decision point. For e-bike owners, the big questions are whether you want a complete front-and-rear hydraulic system, whether the lever wiring matches your bike's motor cutoff connector, and how the brake hoses fit your frame. The Tektro HD-E3520 E-Bike Disc Brake Set 2pin E350 Upgraded Version Front/Rear/Set is a full set that addresses all three, but it comes with a specific configuration you need to know about before buying.
Quick Verdict
If you want a complete hydraulic disc brake system for an e-bike with a 2-pin power connector, the Tektro HD-E3520 is worth considering at USD 104.99. It includes front and rear brakes, uses an open two-piston hydraulic design, and comes with a forged aluminum alloy caliper body. The set is arranged for left-front/right-rear lever control, meaning the left lever operates the front wheel and the right lever operates the rear wheel.
Who This Brake Set Suits
This set suits e-bike riders who are replacing or upgrading a hydraulic brake system and need both wheels covered. It is described as compatible with a universal bike type and Shimano-compatible brake systems, which makes it a practical option for many e-bike conversions. The JULET 2-pin connector on the brake lever is a key feature if your e-bike's motor cutoff system uses that connector style.
What Stands Out
The HD-E3520 is an upgraded version of the HD-E350, and it ships as a complete front/rear set. The front hose is 900mm and the rear hose is 1850mm, so you can compare those lengths to your current routing. The two-piston aluminum alloy forged body adds a concrete structural detail to the set.
Meaningful Trade-Offs
The lever setup is fixed as left front / right rear. If your current bike uses a split configuration with the right lever controlling the front wheel, this set won't match without reworking the connections. Also, while the bike type is listed as universal, the hose lengths are specific: 900mm at the front and 1850mm at the rear. Riders with compact frames or unusual cable routing will need to confirm they can fit those lengths.
Product Overview
#### Tektro HD-E3520 E-Bike Disc Brake Set 2pin E350 Upgraded Version Front/Rear/Set
At USD 104.99, this is a complete front and rear hydraulic brake package. The included 2-pin connector is designed for e-bike motor cutoff integration, and the open two-piston design is a core part of the system specification. The left-front/right-rear arrangement is the one important constraint: it is a connected setup, not a split setup. If that orientation matches your levers, the HD-E3520 is a straightforward way to get a full braking system in one order.
Bottom Line
The Tektro HD-E3520 E-Bike Disc Brake Set is a complete solution for e-bike riders who need a front and rear hydraulic brake system with a 2-pin power connector and a left-front/right-rear lever layout. At USD 104.99, it brings together calipers, levers, and hoses in one set. Just check the lever orientation and hose lengths against your bike before committing, and you'll know exactly whether this set fits your build.
