Following their mechanical disc brake debut, Rever is expanding with two families of hydraulic disc brakes – the Arc & Attack – both offering affordable pricing, powerful braking  & plenty of options. Beyond simply developing budget brakes, Rever also has a new heat dissipating brake pad design that can be added onto any of their brake systems, or even to a number of Shimano brakes.

Rever Attack affordable MTB hydraulic disc brakes

Rever Attack Rever Arc affordable MTB hydraulic disc brakes

A few years back, brake brand Rever sprouted up with mechanical disc brakes out of the same people who were bringing us Jagwire cables & shift/brake accessories. The idea from the start was to offer solid braking performance at affordable pricing. That looks set to expand heavily this year into hydraulic braking with two new Attack & Arc families of brakes for mountain bikes, flat bar road bikes & e-bikes.

The entry-level of the new line-up is the Attack mountain bike brakeset, meant to deliver simple, powerful braking for all manner of trail riding. Available with 2-finger or 3-finger forged alloy levers, the Attacks use a side-specific forged brake lever body with a hinged bar clamp, get tool-free reach adjust, and have a master cylinder that pushes mineral oil to the open system caliper.

Rever Attack Rever Arc affordable MTB hydraulic disc brakesThe Attack brake caliper is a simple two-piece forged alloy, two-piston body design with 22mm pistons, top loading pads, and available in a post mount for the MTB version or a flat mount for the flat bar road model. Interestingly, while the Attack-R is called a road brake, since it offers a flat mount caliper, it will likely get some traction paired with a post mount front for the crop of modern XC bikes that use a flat mount standard rear brake. Claimed weight for the 2 finger Attack is 235g, and comes with a suggested retail from $95 for lever, caliper & standard resin (non-finned) brake pads (special pads & rotors separately.)

Rever Arc affordable MTB hydraulic disc brakes

Rever Attack Rever Arc affordable MTB hydraulic disc brakesThe Arc brake (right) is a slightly more premium setup, even though pricing is almost the same starting from $105 (without rotor or special pads), dropping a few grams down to 221g in its lightest setup.

The Arc again uses a forged body & lever, offers 2 or 3-finger levers, and relies on mineral oil in an open system design at the caliper. The Arc body switches to a dual-bore bladder for the master cylinder which Rever says makes the brake lighter, more compact, and allows it to be swapped to either left or right sides of the bar. The Arc includes tooled reach-adjust, and has a two-piece bar clamp that is compatible with both I-spec II & Matchmaker shifters & dropper remotes.

Rever Attack Rever Arc affordable MTB hydraulic disc brakesWhile the Arc caliper (right, without pads) looks almost identical to the Attack, it does in fact use a slightly larger 24mm two-piston design. The Arc is available only in post mount (so no Road flat mount option.)

Both Attack and Arc also will have an e-bike specific version which will be for OEM customers. It uses the 2-finger lever, and gets an extra wired brake lever sensor to connect to e-bike drive systems.

Rever alloy Heat Dissipation cover brake pads

Rever Attack Rever Arc affordable MTB hydraulic disc brakesThe most visually striking element of the new Rever brakes was actually those orange anodized brake pads. While some more expensive vented or finned disc brake pads incorporate alloy cooling structures into the construction of their pads, Rever took a more simple approach. Starting with the same Shimano standard brake pads that they already use in their mechanical brakes, Rever developed a thin 0.6mm thick aluminum cooling fin that fits between the 1mm thick steel backing plate of their pads & the caliper.

The alloy cooling fin just snaps into place behind the pad to transfer heat out of the brake caliper body and into the wind. That means that when you need to replace your brake pads, you should only need to replace the actual pad, reusing the fin.

Rever Attack Rever Arc affordable MTB hydraulic disc brakes

The special Heat Dissipation Cover brake pads are available for all of Rever’s brakes: Attack, Arc, MCX & MTN1 (a post mount set of mechanical MCX calipers than come paired with their own classic MTB brake levers), plus aftermarket as replacement for brake using Shimano style pads. Rever’s MTB pads are interchangeable with Shimano M9020/M9000/M987/M985/M8000 brakes, and road pads with R9170/RS805/RS505/RS405/RS305 brakes.

Expect to see the new Rever hydraulic disc brakes popping up first on a number of MY2020 bikes this summer (even with custom colored brake pad fins), with aftermarket retail availability soon after.


      • But mineral doesn’t absorb any water that makes it’s way in so it can puddle in the calipers reducing the boiling point to 100 C which means no brakes st all. That won’t happen with DOT fluid. Just sayin’.

        • Water won’t get in. Water gets into DOT systems because the DOT fluid draws moisture through the nylon hose liner (nylon absorbs moisture). The mineral oil repels moisture, moisture stays in the nylon, doesn’t get drawn out. You’ve clearly drank the SRAM Kool-Aid. It’s fine. Their logic makes sense. Doesn’t mean it actually happens.

      • Mineral oil also contains a certain percent air in solution (I have read around 5%), and the air “boils” long before the mineral itself does, thus partly negating some mineral oils’ higher boiling point.

        • Air doesn’t boil. It’ll expand when hot which can result in a mushier feel. That doesn’t seem to happen in practice.

          Regardless of what people believe any fluid is capable of, the only real way to be certain of performance at the extremes is to bleed one’s brakes 1-2/yr. If done, that eliminates any water contamination issues from normal modes of contamination (hose/seal permeability)

          When fluid is relatively new, any well designed system is more than capable of handling heat produced outside of extreme circumstances. People on Shimano/Magura/Campy mineral oil based disc set-ups are not failing at a higher level than SRAM’s and anyone saying so is lying.

          • I do realize air doesn’t boil.
            In the last few years, mineral oil has become a lot more popular, probably mainly because the boiling temps have been brought up. Still, there are some major brake makers who have stuck with DOT fluid, even for one very recent clean-sheet design (Hayes Dominion). If mineral oil is so clearly superior, why do some makers stick with DOT? I don’t mean this as a rhetorical or leading question, I just want to know what you think.
            As for me, I’m still on cable brakes and am quite happy with them!

            • My answer? Engineering & marketing momentum.

              The companies that went with DOT fluid have a lot of design and testing with that fluid. They would need to completely overhaul all their data to make a switch.

              They can also rely on DOT certification for defining min, product characteristics. Shimano likely says Shimano only Mineral Oil and they may have a reason for that as generic “mineral oil” may vary wildly with regards to purity, storage, warehouse life, etc Shimano can’t as easily buy and rebrand whatever DOT fluid is at a good price. SRAM can as it all meets a listed spec. All SRAM will do is ask for specific wet/dry boiling points with a DOT certification.

              That’s all I got. I don’t think one brake system will outperform another based on fluid alone. I prefer mineral oil as I hate dealing with caustic brake fluid.

              • That all sounds very logical. But remember the Hayes Dominion, which was developed only recently and sells for around 250 bucks a wheel- economic considerations probably were not an issue with the making of that brake. And Hayes’ previous brake, the Radar, used mineral oil, so Hayes has data on both types of brake- they could have chosen either type of fluid and went with DOT. But yes, DOT is an increasingly rare choice and I don’t like its toxicity and limited shelf life.

  1. Those heat sinks are interesting…do they dump more heat out into the air compared to, say, a finned variant of the same heat sink?

    Seems like they’ll fit right onto a BR-RS785 post-mount road caliper too, with the Shimano G02A pad shape (non-finned).

    • Definitety they don’t. Not only it’s a separate piece, which lowers the contact surface with braking pads, the total cooling area also seems lower than the finned pads. It looks much nicer though. 🙂

        • I thought so. Mechanical road disc brakes often end up feeling bad because there are several different cable pull standards from different brake makers and different time periods. Shimano SLR Plus, which was used until around 2010, has a different pull ratio than modern Shimano, and Campagnolo has an even shorter pull than old Shimano. I don’t even know about SRAM. I do know there are enough differences to mess things up.

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