Selecting reliable rear brakes is essential for dirt bike safety and performance. This guide highlights five aftermarket options that fit a range of 50cc to 250cc bikes, including hydraulic brake systems, calipers, pads, and master cylinders. Each choice is evaluated on compatibility, durability, and ease of installation. The summary table below gives a quick overview of the featured products.
| Product | Brand | Compatibility | Type | Notes |
|---|---|---|---|---|
| PRO BAT Rear Hydraulic Brake System | PRO BAT | 50cc-125cc | Hydraulic Disc System | Rear/Front compatible; 1450mm hose; 158mm rotor |
| ICONSPORTSS Rear Hydraulic Caliper Kit | ICONSPORTSS | 125cc-250cc | Hydraulic Caliper | Pre-installed pads; 40–50mm bolt spacing |
| YOXUFA Rear Ceramic Brake Pads | YOXUFA | 70cc-125cc | Pads | Ceramic pads; large and small sizes |
| MWMNUN Rear Brake Pads 4 Pack | MWMNUN | Motovox etc. | Pads | 4-pack; high-strength fibers |
| HIAORS Rear Brake Assembly Kit | HIAORS | SSR, 110cc-125cc | Master Cylinder & Caliper | Not for SSR 150; includes pads |
PRO BAT Rear Hydraulic Brake System
This complete rear brake system from PRO BAT combines a caliper, brake pads, a high-compression hydraulic line, a master cylinder, and a lever into a single installable package. The assembly uses a braided stainless steel hose for durability and a robust brake oil line designed to withstand dirt-bike conditions. The caliper mounting holes space 63mm apart, with a 7/8 inch (22mm) hole diameter, and the front rotor plate measures 158mm outboard and 48mm inboard with a 68mm installation pitch and 9mm thickness. It supports front or rear placement, making it adaptable for many 50cc–125cc models.
- Includes caliper, pads, hose, master cylinder, and lever
- 1450mm hose length; heavy-duty braided stainless steel
- Rotor 158mm outer, 48mm inner; 63mm mounting spacing
- Front or rear placement versatility
ICONSPORTSS Rear Hydraulic Caliper Kit
ICONSPORTSS presents a complete rear hydraulic brake assembly with pre-installed pads for immediate use. The kit is designed for broad compatibility across 125cc–250cc dirt bikes and pit bikes from brands such as Apollo, SSR, Taotao, Coolster, SSR, Thumpstar, and more. An adjustable bolt spacing from 40mm to 50mm allows for multiple mounting configurations, simplifying fitment on different frames and swingarms. The kit’s components are engineered for reliable stopping power, with a focus on straightforward installation and consistent pad performance.
- Complete rear hydraulic brake assembly
- Pre-installed pads for quick setup
- Adjustable bolt spacing: 40–50mm
- Wide model compatibility
YOXUFA Rear Ceramic Brake Pads
YOXUFA offers rear ceramic brake pads suitable for 70cc–125cc four-stroke dirt bikes. The set includes large and small pads with precise dimensions: large pads around 75x37x7 mm and small pads around 38x27x9 mm. These pads are compatible with models such as SSR70, SSR110, SSR125, Apollo DB27, Kayo TS90, and Stomp FXJ110. Ceramic compositions tend to provide stable heat performance and reduced dust. When selecting a pad pair, verify the pad sizes match your bike’s caliper design to ensure a proper fit and optimal braking.
- Ceramic brake pads for 70cc–125cc dirt bikes
- Large: 75x37x7 mm; Small: 38x27x9 mm
- Compatible models include SSR and Apollo variants
MWMNUN Rear Brake Pads 4 Pack
MWMNUN provides a 4-pack of rear brake pads designed for common small-displacement dirt bikes and mini-motorbikes such as Motovox MBX10/MBX11, Baja Racer, Doodle Bug, Ct100u, and similar models. The pads use a high-strength fiber friction material intended to improve thermal stability, deliver stronger stopping power, and reduce noise. The set is marketed for easy installation with standard tools and comes in a value-pack format ideal for riders who perform frequent pad replacements. Users should check model compatibility and align pad thickness with caliper requirements to maintain consistent braking.
- 4-pack rear brake pads
- High-strength fiber friction material
- Improved stopping power and quieter operation
- Easy installation with standard tools
HIAORS Rear Brake Assembly Kit
HIAORS offers a rear brake assembly kit that combines a master hydraulic cylinder, caliper, and a replaced disc brake pad for SSR and related dirt bikes. The kit is targeted at 125cc and 110cc models, with compatibility noted for SSR, KLX, BBR, CRF, TTR, SDG and others. It includes a 15mm wheel axle component and specifies not compatible with SSR 150 models. The assembly is designed for straightforward replacement and improved braking leverage, reducing the likelihood of maintaining worn components. As with other hydraulic kits, proper bleeding and torque checks are essential during installation.
- Master cylinder, caliper, and pads included
- Designed for SSR and related 110–125cc bikes
- Not compatible with SSR 150 models
- Includes 15mm wheel axle component
Buying Guide
Choosing rear brakes for a dirt bike involves balancing performance, fitment, and maintenance requirements. Hydraulic disc brakes deliver strong, controllable stopping power and easier modulation, but may require periodic bleeding and inspection of hoses and seals. Drum brakes are simple and budget-friendly but offer limited modulation and generally less heat management. When evaluating options, confirm model compatibility, bolt spacing, rotor or pad dimensions, and whether the kit is a complete assembly or a pad-only replacement.
Brake Type And System
Hydraulic disc systems provide the most consistent braking performance under varied conditions. They convert lever input into hydraulic pressure to clamp a rotor, with components including a caliper, pads, master cylinder, and fluid hose. In contrast, drum brakes rely on drum expansion and tend to require more frequent inspection. For riders seeking reliable high-performance braking, hydraulic discs are typically preferred.
Compatibility And Fitment
Model compatibility is essential. Look for adjustable bolt spacing (40–50mm is common) or fixed spacings (such as 63mm). Verify mounting hole diameters and rotor or pad dimensions align with your frame, swingarm, and caliper design. Reading manufacturer notes helps prevent fitment issues across brands like Apollo, Taotao, Coolster, SSR, Thumpstar, Motovox, and others.
Pad And Rotor Materials
Ceramic pads generally offer lower dust generation and stable heat performance, but pad material choice should match your riding style and caliper design. Rotor size and thickness influence stopping power and heat dissipation. When upgrading, ensure the rotor and pad geometry match your existing caliper to avoid rubbing or poor contact.
Installation Considerations
Some products come as complete assemblies, simplifying installation, while others require pairing a caliper with existing components. Bleeding the hydraulic circuit is often necessary after exchanging the master cylinder or caliper. Follow torque specs and torque sequence for rotor bolts and mounting fasteners to prevent warping or leaks. If unsure, professional installation is recommended.
Maintenance And Longevity
Regular inspection of pads, rotors, hoses, and seals extends braking performance. Check for pad wear indicators, rotor scoring, and any fluid leaks. Ceramic pads may last longer in dry conditions, while organic or metallic compounds respond differently to heat. Keeping a spare set of pads and ensuring proper bedding-in of new pads helps maintain braking reliability.
Budget and Value
Consider overall value: complete hydraulic kits can provide a turnkey upgrade with reliable performance, while pad sets offer cost-effective maintenance. If upgrading multiple components, a bundled kit can simplify installation and ensure system compatibility, though upfront costs may be higher. Prioritize quality components for safety and long-term reliability.