With the growth of gravel riding and adventure bikes comes a wave of new products that are tailored towards that specific type of riding. The Hope RX4 Shimano Road Disc Brake Caliper is a drop bar compatible disc brake designed to work with either Shimano brake lever master cylinders. The Slimline 4 piston features a lightweight design, weighing in at 123g per caliper. With the Monobloc design you'll get a stiffer caliper with a reduced fuzzy lever feel and brake pad rub.
Drop bar hydraulic calipers to suit either Sram or Shimano hydraulic drop bar set ups
Slimline 4 piston lightweight design
Monobloc design creates a stiffer caliper reducing the fuzzy lever feel and brake pad rub
***Please note***Shimano and SRAM brands belong to a third party and have no relation with Hope Technology'
Weight: 123g for a Post Mount Shimano complete caliper
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
DEAD ON ARRIVAL... Both two of these to put on my Cannondale Synapse Carbon Di2 to replace my Shimano BR-RS785. Both arrived dead on arrival. All eight pistons (2x4) were very hard to retract manually by hand. Once bled, not once but twice, the pistons would not retract. I blurped the levers, took out any air behind the pistons... Nothing changed.
COMPATIBILITY ISSUE... I have encountered a NOGO compatibility issue. On my fork I already have the Hope Model-K brake mount adapter and a Dura-Ice RT900 160mm rotor. The RX4 has oval shape mounting holes like Shimano (although they are not right on specs, their holes are a bit smaller then Shimano). Even with the caliper mounted fully toward the exterior (away for the wheel) to the limit of the oval mounting holes, the caliper couldn't be centered with the rotor. I was missing about 2mm. I never had this problem with my BR-RS785 calipers.
Compatibility issue only related to Cannondale bikes? Well then why the Shimano caliper can be mounted perfectly without any glitch. The Hope RX4 post mount version is supposed to be a direct replacement for the Shimano BR-RS785 (info from Hope's website).
Pictures : On the pictures inside the caliper are Hope bleeding blocks included in the box. With them installed it's easier to see that the caliper is not centered on the rotor.
BLEEDING... The RX4 Shimano version needs a SRAM bleeding seringue! Yes you read correctly! And Hope doesn't include a SRAM seringue in the box. So you have Shimano brake system, which uses mineral oil, and you probably have a Shimano bleeding kit at home. Well Hope thinks you're gonna have a SRAM seringue bleeding kit too laying round your work bench. And even if you do have, you're gonna have to fully degrease it from the SRAM DOT oil, because the RX4 Shimano uses mineral oil. And then when you finish bleeding you're gonna have to degrease it again from the mineral oil so it can be ready for whatever SRAM product you need it for. That doesn't make any sense! It's such a bad marketing decision from Hope Tech!
SERVICING... To service the RX4 you need one large bore cap tool and one small bore cap tool. Hope doesn't include them in the box. They sell for 10 USD each and no online retailer has both in stock.
I've had MTB for 25 years now, and this Cannondale Synapse is my first road bike. I had I think what was one of the first hydraulic brakes on a MTB, the 1995 Magura (HS11 model I think?). I still have those and they're still working (but taking dust in my basement for so many years). So I always ride with hydraulic brakes ever since. I can honestly tell you, those Hope RX4 calipers are the worst nightmare I never had regarding hydraulic brakes!
So buy at your own risk. Make sure to check the compatibility with the calipers fully bolted on brake mounts, pads installed, AND wheels/rotors installed. But by doing that make sure you don't leave any mounting marks on the RX4, because you're gonna have a hard time getting a refund in case they don't fit on your bike.
I needed to replace an RS785 that was noisy, I think due to having piston retraction issues, especially after a long downhill. It was driving me nuts. Anyway, after my LBS couldn’t fix it, decided to replace the caliper (front) with this. So far it’s been quiet and strong. For how long, we’ll see. But for now really am glad I took the chance. This is on an Enve Cross Fork/Dura-Ace Di2 setup btw, Vassago TKO.
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