1. Introduction
This manual provides essential instructions for the proper installation, operation, and maintenance of your Shimano Ultegra ST-R8020 hydraulic disc brake lever and BR-8070 flat mount disc brake caliper. This system is designed for high-performance road cycling, offering superior stopping power and modulation in various conditions. Please read this manual thoroughly before use to ensure safe and correct handling of the product.
Important: Bicycle components require precise installation and adjustment. If you are unsure about any part of the installation or maintenance process, it is highly recommended to consult a professional bicycle mechanic.
2. Safety Information
Always prioritize safety when working with or operating bicycle components. Failure to follow these safety guidelines could result in serious injury or damage to your bicycle.
- Ensure all bolts and fasteners are tightened to the manufacturer's specified torque values. Overtightening or undertightening can lead to component failure.
- Regularly inspect brake pads for wear. Replace pads before they reach their wear limit.
- Check brake fluid levels and system integrity periodically. Any leaks or spongy lever feel indicate a need for immediate attention.
- Avoid touching brake rotors immediately after heavy braking, as they can become extremely hot.
- Always wear appropriate safety gear, including gloves and eye protection, when performing maintenance.
- Do not modify the brake system. Use only genuine Shimano replacement parts.
3. Package Contents
The Shimano Ultegra ST-R8020/BR-8070 system typically includes the following components:
- ST-R8020 Hydraulic Disc Brake Lever (Front)
- BR-8070 Flat Mount Disc Brake Caliper (Front)
- Hydraulic Brake Hose (pre-bled or requiring bleeding)
- Resin Brake Pads (pre-installed or separate)
- Installation Hardware (bolts, washers, hose fittings)
Please verify all components are present before beginning installation.
4. Setup and Installation
Proper installation is critical for the performance and safety of your hydraulic disc brake system. Refer to the detailed technical service instructions available on the official Shimano website for comprehensive guidance.
4.1. Lever Installation (ST-R8020)
Mount the ST-R8020 lever onto your handlebar. Ensure the lever is positioned ergonomically for comfortable reach and operation. Tighten the clamp bolt to the specified torque. The lever is designed for the front brake system.
Image 1: Shimano Ultegra ST-R8020 Hydraulic Disc Brake Lever. This image shows the ergonomic design of the lever, which integrates the shift and brake functions for road bikes.
4.2. Caliper Installation (BR-8070)
The BR-8070 caliper uses a flat mount design. Attach the caliper to your frame's flat mount tabs using the appropriate bolts and washers. Ensure the caliper is aligned correctly over the disc rotor to prevent rubbing and ensure even pad wear. Tighten caliper mounting bolts to the specified torque.
Image 2: Shimano Ultegra BR-8070 Flat Mount Disc Brake Caliper. This image displays the compact and aerodynamic design of the flat mount caliper, featuring the Ultegra branding.
4.3. Hydraulic Hose Connection
Connect the hydraulic hose from the ST-R8020 lever to the BR-8070 caliper. Ensure all connections are secure and free of leaks. Use new olive and barb fittings when re-connecting or shortening hoses.
4.4. Brake Pad Installation
The BR-8070 caliper is designed for resin brake pads. Ensure pads are correctly seated and the retaining pin is securely in place. Avoid contaminating pads or rotors with oil or grease.
4.5. Brake Bleeding
After installation or if the lever feels spongy, the hydraulic system must be bled to remove any air. Use genuine Shimano mineral oil and a Shimano bleeding kit. Follow the specific bleeding procedure outlined in the Shimano technical service instructions for the ST-R8020/BR-8070 system.
4.6. Lever Reach Adjustment
Adjust the lever reach to suit your hand size and preference. This is typically done via a small screw or dial on the lever body. Ensure comfortable and full engagement of the brake lever.
5. Operating Instructions
The Shimano Ultegra hydraulic disc brake system provides powerful and consistent braking performance. Familiarize yourself with the feel of the brakes in a safe, controlled environment before riding in traffic or challenging terrain.
- Braking Technique: Apply both front and rear brakes smoothly and progressively. Avoid sudden, hard braking, especially with the front brake, which can cause loss of control.
- Modulation: Hydraulic disc brakes offer excellent modulation, allowing you to precisely control braking force. Practice feathering the levers to control speed without locking up the wheels.
- Wet Conditions: Braking performance may be slightly reduced in wet conditions. Allow for longer stopping distances and apply brakes earlier.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Shimano Ultegra disc brakes.
6.1. Daily/Pre-Ride Checks
- Check brake lever feel: It should be firm and consistent.
- Inspect brake pads for wear and ensure they are not rubbing the rotor when disengaged.
- Verify that the brake hose is not damaged or leaking.
6.2. Periodic Maintenance (Monthly/Quarterly)
- Brake Pad Replacement: Replace resin pads when the pad material wears down to 0.5mm or less. Always replace both pads in a caliper simultaneously.
- Rotor Inspection: Check rotors for wear, damage, or excessive heat discoloration. Replace if damaged or below minimum thickness (usually marked on the rotor).
- Caliper Cleaning: Clean the caliper body and pistons to prevent dirt buildup affecting piston movement.
- Brake Bleeding: Bleed the system if the lever feel becomes spongy or inconsistent, or at least annually, depending on usage.
- Fastener Torque Check: Re-check all mounting bolts for correct torque.
6.3. Cleaning
Clean the brake components with a mild soap and water solution. Avoid using harsh chemicals or solvents that could damage seals or paint. Keep oil and grease away from brake pads and rotors.
7. Troubleshooting
This section addresses common issues you might encounter with your hydraulic disc brake system.
| Problem | Possible Cause | Solution |
|---|---|---|
| Spongy or soft brake lever | Air in the hydraulic system; low brake fluid. | Bleed the brake system; check for leaks. |
| Poor braking power | Worn brake pads; contaminated pads/rotor; air in system. | Replace pads; clean/replace contaminated pads/rotor; bleed system. |
| Brake noise (squealing, grinding) | Contaminated pads/rotor; misaligned caliper; worn pads; loose bolts. | Clean/replace pads/rotor; realign caliper; replace worn pads; check torque. |
| Brake rubbing | Misaligned caliper; bent rotor; sticky pistons. | Realign caliper; true rotor or replace; clean caliper pistons. |
If you cannot resolve an issue, consult a professional bicycle mechanic.
8. Specifications
- Brand: SHIMANO
- Model: ST-R8020 (Lever), BR-8070 (Caliper)
- Brake Type: Hydraulic Disc Brake
- Lever Type: Dual Control Lever (Shift/Brake)
- Caliper Mount Type: Flat Mount
- Brake Pad Type: Resin (L03A or L04C recommended)
- Hydraulic Fluid: Shimano Mineral Oil
- Material (Lever/Caliper Body): Aluminum
- Handle Material: Stainless Steel
- Color: Black
- Approximate Weight: 1.9 Pounds (complete front system)
- Intended Use: Road Cycling
9. Warranty Information
Shimano products are covered by a manufacturer's warranty against defects in materials and workmanship. The specific terms and duration of the warranty may vary by region and product. Please retain your proof of purchase.
For detailed warranty information, including terms, conditions, and how to make a claim, please refer to the official Shimano website or contact your local Shimano distributor.
10. Support and Contact
For technical assistance, spare parts, or further inquiries regarding your Shimano Ultegra ST-R8020/BR-8070 hydraulic disc brake system, please utilize the following resources:
- Official Shimano Website: Visit bike.shimano.com for technical documents, FAQs, and product information.
- Authorized Shimano Dealer: Your local authorized Shimano dealer or service center can provide expert advice and professional service.
- Customer Service: Refer to the Shimano website for regional customer service contact details.