The Shimano BR-6700 [paid link] brakes, part of the Ultegra 6700 series, are renowned for their precise modulation and consistent braking power. However, like any high-performance road component, they demand proper attention to maximize their operational lifespan. Premature wear not only reduces performance but can also lead to costly repairs or replacements. This guide outlines how to prevent early deterioration and ensure your BR-6700 [paid link] brakes function flawlessly for the long haul.
Understand the Design and Wear Points of the BR-6700 [paid link]
The BR-6700 dual-pivot caliper design delivers enhanced stopping efficiency while maintaining a lightweight profile. Each arm pivots independently, distributing braking force more evenly across both brake pads. While efficient, this setup introduces several wear-prone elements:
- Brake pad surfaces wear due to friction with the rim.
- Pivot bushings and return springs degrade over time from dirt ingress and corrosion.
- Cable actuation points and barrel adjusters can seize or wear with poor maintenance.
- Mounting bolts may loosen, introducing flex and reduced braking precision.
Recognizing these points helps in prioritizing regular checks and upkeep.
Maintain Brake Pad Alignment and Rim Contact
Incorrect brake pad alignment is a common cause of uneven wear and premature pad failure on the BR-6700. Pads should be toed-in slightly—meaning the front of the pad contacts the rim just before the rear—to minimize squeal and avoid chattering. If the pads are misaligned and rub either too high or too low on the rim, they can cause rapid pad erosion or rim damage.
Additionally, excessive pad wear can indicate improper compound for the riding conditions. For wet or mixed-weather use, consider pads designed for higher durability, but ensure they’re compatible with the BR-6700 caliper arms.
Clean and Inspect Regularly
Road grime, brake dust, and debris accumulate quickly around braking surfaces and pivot areas. Left unchecked, these contaminants introduce abrasive particles that expedite wear. To counter this:
- Wipe down calipers and pads after every few rides, especially in wet conditions.
- Use a soft brush to remove grit from around pivots and springs.
- Avoid high-pressure water streams that could force dirt into bushings or wash away lubrication.
At least once a month, remove the pads and inspect them for embedded grit and uneven wear.
Lubricate Pivot Points Without Overdoing It
A light application of lubricant to the pivot bolts and return springs reduces friction and prevents corrosion. Use a precision applicator and avoid oversaturation, which can attract dust or contaminate brake pads. After application, operate the caliper arms to distribute the lubricant, then wipe off any excess.
Never lubricate the brake pad contact surfaces or the rim itself. This not only compromises braking efficiency but can lead to dangerously poor stopping power.
Ensure Proper Torque on Mounting Bolts
Loose brake calipers can shift under load, leading to pad misalignment, vibration, and accelerated wear. Always verify that the center mounting bolt is tightened to Shimano’s recommended torque specification (typically 8–10 Nm for the BR-6700).
Additionally, periodically check the pad-holding bolts and barrel adjuster lockrings to ensure nothing has loosened due to vibration or regular use.
Replace Brake Pads Before They’re Fully Worn
The BR-6700 pads have a wear line indicating the safe usage limit. Riding beyond this line can lead to metal-to-rim contact, which damages both the rim and the caliper arms. Replace pads proactively when they’re near this limit rather than waiting for a noticeable performance drop.
For riders in hilly regions or those frequently riding in the wet, pad wear can accelerate. Keeping a maintenance log helps anticipate when replacements are due.
Cable Tension and Housing Condition Matter
Worn or corroded cables increase friction, reducing brake responsiveness and requiring more force at the lever. Over time, this stresses both the lever and caliper return spring. Check for frayed cables and cracked housing insulation. Replace components showing rust, discoloration, or resistance when actuated.
Store the Bike in Controlled Conditions
Exposure to moisture and fluctuating temperatures can lead to premature corrosion of the BR-6700’s pivot bushings and bolts. Store the bike indoors and away from humid environments when possible. If the bike is stored for extended periods, periodically actuate the brakes and check for developing stiffness or corrosion.
Avoid Mixing Incompatible Components
Using incompatible levers, pads, or wheels can compromise brake performance and lead to uneven wear. The BR-6700 is optimized for Shimano STI levers with the matching cable pull ratio. Mixing with other systems can cause overextension or underperformance, resulting in excessive strain on the pads and pivots.
Upgrade Pads for Specific Use Cases
While the stock pads perform well across general road conditions, upgrading to a compound that matches your local terrain or climate can extend lifespan. For example, all-weather pads may wear slower and provide more consistent braking in wet conditions, reducing pad turnover frequency.
Conclusion
The Shimano BR-6700 brakes are a durable and precise stopping system, but they require regular care to perform optimally over time. Proper alignment, frequent inspection, and component-compatible upgrades are all essential in preventing premature wear. By implementing these strategies, riders can not only avoid unexpected failures but also enjoy consistent and confident braking across countless rides.