Shimano BR-UR300 Hydraulic Disc Brake Caliper - Altus
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Product Information
Full details
The Shimano BR-UR300 is an ideal upgrade for urban cyclists and commuters seeking reliable, all-weather stopping power without the bulk of high-end mountain bike components. This hydraulic disc brake caliper excels at providing consistent modulation and low-maintenance operation for daily riding; however, it is strictly designed for resin pads and flat-mount specific frames, limiting its compatibility with some road or older mountain bike systems.
All features
| Series | Altus |
|---|---|
| Model Part Number | BR-UR300 |
| Brand | Shimano |
Extended Product Information
FAQs
Can I use metal or sintered brake pads with the BR-UR300?
No, this model is specifically engineered for use with resin pads.
Is the BR-UR300 compatible with road shifters?
It depends on your shifter's pull ratio and fluid type; always confirm your brake lever system is hydraulic mineral oil compatible.
Does this come with a brake lever or hose?
The BR-UR300 refers specifically to the caliper unit; it typically requires separate purchase of compatible levers and hydraulic lines.
How often should I bleed the brakes?
You should bleed the system if the lever feel becomes soft, or as part of a yearly maintenance routine for optimal performance.
Can I mount this on a post-mount frame?
No, this is a dedicated flat-mount caliper and cannot be directly mounted to post-mount tabs.
Troubleshooting
Brake feels spongy or soft at the lever
Air may be trapped in the system; perform a one-way bleed procedure to clear bubbles from the line.
Rotor rubbing or squealing
Re-align the caliper to ensure the rotor is centered in the gap, and clean the rotor surface with isopropyl alcohol.
Reduced stopping power
Check if the resin pads are contaminated with oil or grease; replace pads if contamination is present.
Pros and Cons
Pros
- Reliable hydraulic stopping power for urban riding
- Easy to maintain with one-way bleeding architecture
- Low-profile aesthetic fits modern bikes
- Reduced rotor drag due to improved clearance
- Simple shim-less installation process
Cons
- Requires flat-mount frame compatibility
- Restricted to resin brake pads only
- Not intended for high-intensity downhill or gravity racing
- May require adapter brackets for specific rotor sizes
Setup, Compatibility & Care
The BR-UR300 is designed specifically for flat-mount systems. During installation, the shim-less mount allows you to bolt the caliper directly to the frame or fork mounts, though you may need a specific adapter based on your rotor size (160mm is standard). Always ensure the rotor is centered within the increased clearance gap to prevent noise. Regarding care, use only Shimano genuine mineral oil; avoid DOT fluid as it will damage the internal seals. Periodically check your B01S resin pads for wear; if the pad material is less than 0.5mm thick, replace the pads immediately to maintain braking integrity.