Overview
This is a Pro-Spec Aluminum Brake Caliper for Promoto-MX/SM. This is the ultimate upgrade to your Losi® Promoto-MX/SM to improve your bike's performance. Experiencing brake fading is not acceptable when you need it the most. Pro-Line has developed a brake caliper with a progressive pitch cam and ball bearings for smooth braking performance. With a progressive pitch cam, braking starts faster and holds tighter when engaged. The Pro-Spec Aluminum Brake Caliper uses high performance steel brake pads and has a 6061 Hard Anodized housing that adds strength and durability to handle extreme punishment.
Upgrade your Losi® Promoto-MX/SM brake system today!
PRO640800 | Pro-Spec Aluminum Brake Caliper for Promoto-MX/SM
Features
- Incredible Stopping Power
- Pre-Assembled
- Easy Installation
- Progressive Pitch Cam Mechanism
- Ball Bearings for Smooth Actuation
- High Performance Steel Brake Pads
- 6061 Hard Anodized Housing
- Direct Replacement for Losi Promoto
Overview
The Pro-Line 1/4 Pro-Spec Aluminum Brake Caliper for Promoto-MX/SM is the ultimate performance upgrade for your Losi Promoto motorcycle. Whether you're racing competitively or enjoying weekend bashers, brake performance is absolutely critical to your riding experience. This premium brake caliper directly addresses one of the most common issues riders face: brake fading during intense riding sessions. When you need your brakes to perform at their best, Pro-Line has engineered a solution that combines advanced mechanical design with premium materials to deliver stopping power you can rely on every single time.
Designed specifically for the Losi Promoto-MX and Promoto-SM platforms, this brake caliper represents a significant step up from standard motorcycle components. The engineers at Pro-Line recognised that stock brake systems can lose effectiveness under demanding conditions, leading to inconsistent braking and reduced control. By developing the Pro-Spec Aluminum Brake Caliper with a progressive pitch cam mechanism and ball bearings for smooth actuation, Pro-Line has created a direct replacement that transforms your braking experience. UK RC enthusiasts who take their Promoto motorcycles seriously will immediately notice the difference in stopping distance, modulation, and overall confidence when negotiating challenging terrain or high-speed sections.
This is not just a cosmetic upgrade—it's a functional enhancement that makes your Losi Promoto-MX/SM more responsive, more controllable, and more competitive. The pre-assembled design means installation is straightforward, allowing you to get back to riding faster. Combined with high-performance steel brake pads and a durable 6061 hard anodised housing, this is the brake caliper serious Promoto riders choose when they want to eliminate brake fading and maximise their bike's potential.
Key Features
- Progressive Pitch Cam Mechanism — This advanced cam design ensures that braking starts faster and holds tighter when engaged, providing superior modulation and control compared to standard brake calipers. The progressive pitch means initial brake application is responsive whilst sustained pressure delivers consistent holding force, giving you precise control over your stopping power in all riding conditions.
- Ball Bearings for Smooth Actuation — Integrated ball bearings within the caliper housing ensure that brake lever movement translates to smooth, predictable braking action without binding or sticking. This smooth operation means less hand fatigue during extended riding sessions and more consistent brake modulation throughout your ride.
- High-Performance Steel Brake Pads — Pre-installed premium steel brake pads provide superior friction and heat dissipation compared to standard pads, ensuring consistent braking performance even under extreme riding conditions. These pads are engineered to resist fading and maintain their effectiveness over extended use.
- 6061 Hard Anodised Aluminium Housing — The caliper body is constructed from aerospace-grade 6061 aluminium with hard anodising, creating a lightweight component that can withstand extreme punishment from aggressive riding, crashes, and high-impact terrain. The anodised finish provides corrosion resistance and adds visual durability to your motorcycle.
- Pre-Assembled Design — Unlike some aftermarket components requiring extensive setup and tuning, this brake caliper arrives completely assembled and ready to install. This means minimal setup time and the assurance that Pro-Line has factory-tuned the brake response for optimal performance from the moment you bolt it on.
- Direct Replacement for Losi Promoto — Engineered as a precise direct replacement for the Losi Promoto-MX and Promoto-SM motorcycle brakes, this caliper requires no modifications or custom fabrication. It bolts directly onto your existing motorcycle without any adapters or additional components, making installation accessible even to less experienced riders.
- Incredible Stopping Power — The combination of progressive cam design, quality steel pads, and smooth bearing actuation creates stopping power that significantly exceeds stock components, giving you confidence to brake later and harder in competitive situations or technical terrain.
- Easy Installation — Despite its sophisticated engineering, this brake caliper is designed for straightforward installation using standard tools. Pro-Line has ensured that even riders without extensive mechanical experience can upgrade their braking system without frustration or complicated procedures.
Technical Performance
The Pro-Spec Aluminum Brake Caliper represents a significant engineering achievement in 1/4 scale RC motorcycle braking systems. Constructed from 6061 aluminium with hard anodising, the caliper housing provides the perfect balance between lightweight construction and structural rigidity required for intense riding. The progressive pitch cam mechanism is the heart of this brake's performance—it fundamentally changes how the brake responds to lever input, ensuring that initial brake application is crisp and responsive whilst sustained pressure delivers unwavering holding force. This is achieved through careful engineering of the cam profile, which gradually increases mechanical advantage as the brake lever travels, creating a natural progression from light modulation to maximum braking force. The integrated ball bearing system eliminates friction points that plague standard caliper designs, ensuring that every movement of the brake lever translates directly into proportional braking action without dead spots, sticking, or binding. The included high-performance steel brake pads are engineered specifically for this caliper, providing the correct coefficient of friction and thermal properties to work optimally with the cam and bearing system. These premium pads resist fade far better than standard components, maintaining consistent braking performance even during extended riding sessions or when pushing hard through multiple consecutive braking events. The anodised aluminium housing not only adds visual appeal in gold colouring but also provides enhanced corrosion resistance, meaning your brake caliper will maintain its performance and appearance even in damp UK weather conditions or after splashing through muddy terrain. For Promoto-MX/SM owners in the UK who demand the best from their RC motorcycles, whether racing competitively or bashing for fun, this brake caliper delivers the engineering quality and performance consistency needed for serious riding.
What's in the Box
- 1x Pre-Assembled Pro-Spec Aluminum Brake Caliper with Steel Brake Pads
Frequently Asked Questions
- Will this brake caliper fit my Losi Promoto motorcycle? — This Pro-Spec Aluminum Brake Caliper is engineered as a direct replacement for both the Losi Promoto-MX and Losi Promoto-SM motorcycles. It bolts directly onto these platforms without requiring any modifications, adapters, or custom fabrication work. Installation is straightforward and requires only basic tools.
- What makes this brake caliper better than the stock Promoto brakes? — The Pro-Line Pro-Spec Aluminum Brake Caliper features a progressive pitch cam mechanism that starts braking faster and holds tighter, ball bearings for smooth actuation without binding, and high-performance steel brake pads that resist fading. The 6061 hard anodised aluminium housing is significantly more durable than stock components. Most importantly, it eliminates brake fading during intense riding sessions, giving you consistent stopping power every single time.
- Is this suitable for both racing and casual bashing? — Absolutely. Whether you're competing in races or enjoying weekend recreational riding with friends, this brake caliper delivers performance benefits. The progressive cam design provides excellent modulation for technical racing whilst the reliable stopping power and fade-resistance make it ideal for casual bashers who push hard through challenging terrain.
- Does this brake caliper require any special maintenance? — The Pro-Spec Aluminum Brake Caliper is engineered for durability and minimal maintenance. Occasionally inspecting the brake pads for wear and ensuring the brake lever operates smoothly is all that's required. The ball bearing system requires no lubrication or adjustment, and the anodised aluminium housing is corrosion-resistant even in damp UK conditions.
- How difficult is installation? — Installation is very straightforward. Since this is a direct replacement for the Losi Promoto brakes, it bolts directly onto your existing motorcycle without modifications. The pre-assembled design means you're simply removing the stock caliper and installing this one—no tuning, bleeding, or complicated procedures required. Most riders can complete installation in under 30 minutes with basic tools.
- Can I use this on a Promoto-MX and also fit it to a Promoto-SM? — Yes, this brake caliper is compatible with both the Losi Promoto-MX and the Promoto-SM. It's engineered to work with both platforms, making it an ideal upgrade regardless of which Promoto motorcycle you own.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the PRO 1/4 Pro-Spec Aluminum Brake Caliper: Promoto-MX/SM G-PRO640800 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
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