ZOOM Hydraulic Disc Brake Calipers: HB-100 MTB Bike Disc Brakes Front & Rear Caliper Set for Mountain, Road Bicycle and E-Bike

nice brakes after you break them in. the install was not bad but NO INSTRUCTIONS and simple box. they DONT INCLUDE THE CABLE END CAPS.... these are 100% needed after you have to cut the cable to remove old caliper and install new one. WHY NO END CAPS ...there really inexpensive. AND NO EXTRA WASHERS for spacing. these two items cost about 5 cents really to the maker and make installing alot easy. most caliper installs involve centering the caliper to the post and it not allways a exact fit. and not end caps when everyone has to cut the the old end cap off is a huge problem as you now need to order end caps and probley washers too! i had some squealing after so i probley need to do the paper trick to get them spaced better. as brake pads and rotors get used they expand meaning you need a min extra space to allowing for expanding. brake makers should provide a super thin spacer you can remove after adjustment so there room for expanding due to heat. a super thin metal like what used to do valve lashing or you might wanna buy two for getting for you install. that way you get no brake squeal after. as when the temp changes the pads are not in direct contact when not in use.

I replaced rear mechanical caliper with zoom caliper, centered by depressing brake handle and tightened centering adjustment screws. Brake handle feels firm and wheel will brake while off ground. When I test while riding new caliper barely seems to slow e-bike. Brake handle is not spongy and was sold as not needing to require bleeding. No instructions were included with caliper to do so.

These made a definite improvement in my Velotric Discover mechanical brakes. Probably not as much as changing to a fully hydraulic system, but the upgrade couldn't have been easier, and the brakes are much smoother now. I am very satisfied.

With a little caliper centering and cable pull adjustment, these calipers performed exceptionally well. Compared to the "dual piston" mechanical brake calipers, this set is easier to modulate, engages quicker, has a firm (reassuring) grippy feel, and produces far more stopping power. Not to mention the install is very easy. You can use the calipers on any bike that already has mechanical disc brakes. Simply remove the old caliper and install the new one. For the most part, you won't need to replace the old brake cable or housing and you can leave the stock levers. This makes "drop bar" road and gravel bikes a prime candidate for an inexpensive hydraulic brake upgrade.

Bought these for the price and to upgrade the brakes on my Ozark Trail G1 Explorer. They immediately improved the stopping power! However, installation was finicky for me (a beginner cyclist). The actual installation of the hardware was pretty much plug and play, however it was tedious and difficult for me to adjust the pads to where my disc wasn’t rubbing against the pads. These brakes also fixed a huge issue I had with my stock brakes: squeal. No matter how much I cleaned the old brakes, they squealed for dear life the next day. However with these, they’ve been pleasantly quiet.