Shimano 105 Hydraulic Disc Brakes: A Comprehensive Review

Shimano 105 Hydraulic Disc Brakes: A Comprehensive Review

Shimano's 105 groupset has long been the benchmark for value in performance cycling. For years, riders have lauded its mechanical and rim brake iterations for their reliability and excellent shifting. However, when Shimano first introduced hydraulic disc brakes at the 105 level with the RS505 levers, the reception was somewhat mixed. While the braking itself was commendable, the shifting performance felt like an afterthought, lacking the seamless integration expected from a cohesive groupset. Fast forward to the current 7000 series, and the question on many cyclists' lips is: have Shimano's 105 hydraulic disc brakes, specifically the R7020 levers and R7070 callipers, finally matured? The answer, in a word, is a resounding 'yes'. They represent a significant leap forward, offering a compelling package for any cyclist considering a new disc-braked road bike, despite the initial cost of upgrading.

The Case for Hydraulic Disc Brakes

For the vast majority of riding conditions, hydraulic disc brakes are, quite simply, superior. Their primary advantage lies in their immense power, which can be applied with significantly less lever effort compared to traditional rim brakes or even mechanical disc brakes. This enhanced modulation allows for finer control over speed, especially on challenging descents. Furthermore, their performance remains consistent whether you're tackling a long, sweeping descent in the Alps during summer or navigating a freezing, rain-soaked winter commute. The self-centring nature of the callipers means that regular maintenance is minimal, primarily involving the straightforward replacement of worn brake pads. Crucially, you're braking against a robust steel rotor, preserving the integrity of your carbon or alloy wheel rims, which can be rapidly eroded by the grit and grime of wet-weather riding.

While hydraulic systems do have a few drawbacks, such as potential fiddliness during initial setup (though this was not the case with the R7020s), occasional noise in muddy conditions, or the need to true wobbly rotors, the benefits overwhelmingly outweigh these minor inconveniences. For many, the enhanced control and confidence they inspire are invaluable.

R7020 Lever Design: A Complete Overhaul

The R7020 lever represents a complete departure from its predecessor, the RS505. Shimano has clearly taken inspiration from the highly regarded mechanical 105 levers, adopting a similar lever shape and a familiar hood profile. The textured finish on the hood provides excellent grip, even in wet conditions. While the lever body is slightly larger, particularly at the point where the hose exits, this increased size has eliminated the awkward bump found on the RS505, resulting in a much more ergonomic and comfortable shape. The subtle gap that formed between the bar tape and the lower part of the hood, a consequence of the redesigned lever body, was barely noticeable in practice and did not detract from the overall feel.

Setting Up the R7020 System: Simplicity Itself

Fitting these brakes was remarkably straightforward, with the only real challenge being the internal routing of the brake hose through the frame of the test bike. The R7020 levers arrive with the hoses pre-attached and filled with mineral oil, complete with a protective seal and anti-compression insert at the hose end. This is convenient if you don't need to shorten the hose. However, for most builds, shortening the hose will be necessary. The process of removing the old insert, cutting the hose, and re-fitting a new one is a simple procedure.

The lever itself is also pre-filled with oil, sealed with a yellow stopper at the cable port. To complete the hydraulic seal, you simply remove the stopper, undo the cable port, thread the hose through the port and the pre-installed compression olive, reassemble, and tighten. A small amount of mineral oil may escape during this process, so it's advisable to wrap a rag around the lever to prevent any drips from contaminating the brake rotor – a critical step for optimal performance.

The R7070 callipers are of the flat-mount variety, a design choice that aligns with modern frame standards. Shimano does not offer a post-mount option for this particular iteration, which may limit compatibility with some older frames. While it's possible to adapt flat-mount callipers to post-mount frames using custom brackets, it's essential to ensure proper alignment. Flat-mount callipers generally offer less room for error during installation; any misalignment in the frame or fork facing can lead to rotor rub, necessitating precise alignment for optimal performance.

In this review, the setup was relatively trouble-free. Achieving a clean rotor run with no brake squeal or rubbing was easily accomplished with minor adjustments to one of the rotors. Despite a minor mishap with an initial incorrect hose routing, which required re-sealing one lever, the system worked flawlessly, and crucially, no bleeding was required.

Bleeding the System: A Quick and Easy Task

Should your hydraulic system require bleeding, the process is refreshingly simple. A bleed port is conveniently located under the rubber cover at the top of the lever. By removing the cover, attaching a funnel, and pushing mineral oil through the system from the calliper end, any air can be effectively flushed out. This task typically takes around five minutes, making it one of the more user-friendly hydraulic bleeding procedures available. While Shimano offers a dedicated bleed kit, more affordable alternatives are also readily available.

Gear Cable Integration

The R7020 levers are designed to accommodate gear cables seamlessly. The process of fitting and removing the cable is identical to that of the mechanical 105 levers. The cable emerges from the lever body when in the lowest gear position, and a small, removable plate facilitates easier routing around the tight internal radius of the lever body. A specially designed cable end with a distinct ridge ensures a secure and precise connection within the lever. The indexing and shifting to the derailleurs remain consistent with a full mechanical groupset setup.

R7070 Calliper Design: Refinements for Performance

The R7070 callipers bear a strong resemblance to their predecessors, with one notable improvement: the inclusion of Shimano's Ice Tech pads, complete with integrated heatsink fins. These fins are designed to dissipate heat effectively, reducing the risk of brake fade during prolonged braking. Beyond this enhancement, the fundamental design remains consistent: a two-piston system, with the hose exiting on the inside of the calliper to maximise heel clearance. The bleed port, positioned at the very bottom of the calliper, further simplifies the bleeding process.

Braking Performance: A Revelation

Once fitted and, if necessary, bled, the R7020 brakes deliver an exceptional braking experience. Compared to the SRAM Force groupset previously fitted to the test bike, and even the mechanical 105 with TRP Spyre brakes, the 105 hydraulics offer the best of all worlds. They perform brilliantly straight out of the box and are remarkably fuss-free.

Early iterations of Shimano's disc brakes sometimes exhibited issues with the bite point, but this has been comprehensively addressed in the R7020 system. The brakes engage predictably within the lever travel, offering a substantial reserve of stopping power that can be accessed when needed. The lever reach is adjustable, and for those with smaller hands, Shimano offers the R7025 lever with a more compact design. The level of effort required to control speed on steep, loose descents is a genuine revelation compared to rim brakes or mechanical discs. This confidence-inspiring control transforms challenging descents into enjoyable experiences.

Once accustomed to the bite point and lever feel, even the most demanding roads become manageable. This is precisely why hydraulic disc brakes are considered the pinnacle of braking technology. There are certain roads that, on bikes with less capable brakes, are actively avoided due to the sheer lack of fun involved. Testing the R7020s on these very roads, the brakes proved more than capable, inspiring confidence even on steep descents with sharp turns and greasy surfaces. The ease with which speed can be modulated, even when braking from the hoods, brings a smile to the rider's face. Descending in the drops further enhances this feeling, making subtle speed adjustments almost second nature. Reverting to a bike with less effective brakes after experiencing the R7020s is a stark reminder of their superiority.

In wet conditions, the R7020 brakes outperformed the SRAM Force brakes previously used, not necessarily in peak power, but in their reduced susceptibility to squealing and chattering. While some noise can still occur if grit becomes lodged between the pads and rotors, it was noticeably less prevalent and the overall braking experience was significantly quieter. This was observed even when using the same TRP rotors that had previously been used with the SRAM brakes.

In terms of predictable and reliable speed control, especially in adverse weather, hydraulic discs are unparalleled. Their performance is not dictated by the surface conditions, truly earning their keep when the weather turns foul. While 105 dual-pivot callipers with alloy braking surfaces on a race bike offer comparable performance in the dry, requiring a slightly higher lever effort, the discs hold a distinct advantage in the wet. The difference in performance between disc brakes and rim brakes, particularly on carbon rims in wet conditions, is quite simply night and day.

Shifting Performance: Seamless Integration

The shifting performance delivered by the R7020 levers is virtually indistinguishable from that of the R7000 mechanical levers. When paired with a long-cage R7000 rear derailleur and an older 105-5800 front derailleur, the shifts were consistently crisp and predictable. The lever action has been refined, with a shorter throw making upshifts, particularly when riding on the drops, noticeably easier. When fitted to a flared Ritchey VentureMax handlebar, which angles the levers outwards, the shifting felt even more intuitive and accessible.

This represents a substantial improvement over the previous RS505 levers, where shifting was considered the weak point. With the R7020s, you are experiencing the performance of a truly integrated and high-quality groupset, evident in both the ergonomic lever design and the precision of the shifts. The smoothness of the shifting is a significant upgrade.

Conclusion: A Worthy Investment

Are hydraulic disc brakes a necessity for every cyclist? No. However, much like pneumatic tyres, freewheels, clincher rims, indexed shifting, brifters, and electronic groupsets, hydraulic disc braking represents a tangible improvement over what came before. Remember the initial skepticism surrounding disc brakes in mountain biking and cyclo-cross? They eventually prevailed because they are, quite simply, better.

If you are in the market for a new bike equipped with disc brakes, the R7020 system is an excellent choice. The entire R7000 groupset is outstanding, and with this iteration, the levers and brakes finally match the performance of the rest of the components, rather than feeling like an add-on. For those looking to upgrade from a mechanical setup, these brakes are a compelling option. While the retail price of around £450 a pair (though often available for less with diligent shopping) positions them as a significant investment, the performance gains justify the cost. The value proposition remains strong.

Verdict

A significant advancement from the previous generation, offering superb braking performance and the refined aesthetics and feel of the 105 groupset.

Frequently Asked Questions

Q1: Are Shimano 105 hydraulic disc brakes worth the upgrade from mechanical brakes?
Yes, the improvement in braking power, modulation, and all-weather performance is substantial, making them a worthwhile upgrade for most riders.

Q2: Do Shimano 105 hydraulic disc brakes squeal?
While any disc brake can potentially squeal if contaminated with dirt or oil, the R7020 system is generally less prone to noise than some previous iterations or other systems, especially in wet conditions.

Q3: Are the R7020 levers compatible with all bikes?
The R7070 callipers are flat-mount, which is standard on most modern road bikes. However, if your frame has post-mount calliper mounts, you may need adapters or consider a different calliper option.

Q4: How often do Shimano 105 hydraulic disc brake pads need replacing?
This depends heavily on riding conditions, mileage, and braking habits. However, hydraulic brake pads generally last longer than rim brake pads and are relatively easy to replace.

Q5: Can I mix Shimano 105 R7020 levers with other Shimano derailleurs?
Yes, Shimano's 11-speed road components are generally cross-compatible. You can typically use R7020 levers with other 11-speed Shimano road derailleurs (e.g., Ultegra, Dura-Ace) and vice-versa, though optimal performance is usually achieved with components from the same series.

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