The Campagnolo Record 12s Disc Brake [paid link] is a high-performance component designed to deliver smooth, reliable braking for serious cyclists. Proper adjustment of the limit screws is crucial for ensuring that the shifting and braking functions seamlessly. Misaligned limit screws can lead to poor braking performance, uneven pad wear, and reduced efficiency.
This guide will take you through the essential steps to properly adjust the limit screws on your Record 12s Disc Brake [paid link], ensuring you achieve optimal braking performance and longevity.
What Are Limit Screws and Why Are They Important?
Limit screws on your Campagnolo Record 12s Disc Brake [paid link] system control the maximum and minimum positions of the brake calipers. These screws ensure that the brake pads do not rub against the disc rotor when the brake lever is not engaged or when the braking force is applied. Proper adjustment of these screws helps in achieving smooth operation and preventing unnecessary wear on the braking system.
There are two limit screws:
- Outer Limit Screw (B-screw): This screw sets the maximum distance between the brake pads and the rotor, ensuring the pads do not push too far apart when the brake lever is released.
- Inner Limit Screw (A-screw): This screw determines the minimum distance the pads can travel toward the rotor. It ensures that the brake pads don’t stay too far from the rotor when braking, providing consistent engagement.
Tools Required
Before beginning the adjustment process, ensure you have the following tools on hand:
- 2.0 mm Allen wrench [paid link] (for adjusting the limit screws)
- 5 mm Allen wrench [paid link] (for securing the caliper)
- Torque wrench [paid link] (optional, for tightening bolts to precise torque values)
- Clean rag (for cleaning the brake components)
- Disc brake cleaner (for cleaning rotor and pads)
How to Adjust the Limit Screws on the Campagnolo Record 12s Disc Brake
Step 1: Position the Bike and Inspect the System
Place the bike in a stable position, either on a repair stand or leaned securely against a wall. Spin the wheels to ensure that there is no visible rubbing or resistance from the brake pads. Check the alignment of the brake caliper to ensure it is centered over the rotor. A misaligned caliper can cause uneven pad wear or poor braking performance.
Step 2: Loosen the Caliper Mounting Bolts
Using a 5 mm Allen wrench [paid link], loosen the caliper mounting bolts slightly. This allows you to make fine adjustments to the caliper’s position and alignment. Do not remove the bolts completely; just loosen them enough to enable adjustment.
Step 3: Adjust the Inner Limit Screw (A-screw)
Start with the inner limit screw, located on the brake caliper. Turn it clockwise to reduce the distance between the brake pads and the rotor, or counterclockwise to increase the gap. The goal is to have the brake pads just slightly off the rotor when the brake lever is not engaged.
Check the rotor’s clearance by rotating the wheel and observing the brake pads as they pass over the rotor. You should aim for a minimal but consistent gap, ensuring the brake pads don’t drag on the rotor.
Step 4: Adjust the Outer Limit Screw (B-screw)
Next, adjust the outer limit screw. This screw controls how far apart the brake pads can be when the brake lever is released. Turn the screw clockwise to bring the pads closer together or counterclockwise to create more space.
Make sure the gap between the pads is not too wide, as this could result in a lack of braking power. On the other hand, setting the pads too close to the rotor can lead to constant pad contact and potential overheating. Again, rotate the wheel to ensure there is no rubbing, and make final adjustments as needed.
Step 5: Test the Brake Function
After making adjustments to both limit screws, test the brake function by squeezing the brake lever and checking for smooth, even pad engagement. The brake pads should make contact with the rotor as soon as you engage the lever but should not cause dragging when the lever is released.
Step 6: Re-tighten the Caliper Bolts
Once you are satisfied with the position of the brake pads, securely tighten the caliper mounting bolts using the 5 mm Allen wrench. Be sure to apply the correct torque settings specified by Campagnolo to avoid over-tightening or under-tightening, which could affect brake performance.
Step 7: Check Rotor and Pad Wear
After securing the caliper, it’s essential to check the condition of the rotor and brake pads. Inspect the rotor for any scoring or debris that might interfere with the braking performance. Clean the rotor and brake pads with a clean rag and disc brake cleaner to remove dirt or grease.
Common Issues and How to Fix Them
Issue 1: Brake Pads Rubbing on Rotor
If you notice that the brake pads are rubbing on the rotor, you may need to adjust the inner limit screw (A-screw) to increase the gap between the pads and rotor. Alternatively, the caliper might not be aligned correctly, requiring a re-adjustment of its position.
Issue 2: Inconsistent Braking Power
If the braking power feels inconsistent, it could be due to uneven adjustment of the limit screws or wear in the brake pads. Ensure that both the inner and outer limit screws are set to provide consistent pad engagement and rotor clearance.
Issue 3: Difficulty in Engaging the Brake Pads
If the brake pads are too far from the rotor, the braking system will feel unresponsive. Adjust the outer limit screw (B-screw) to bring the pads closer to the rotor, ensuring quicker and more effective braking.
Conclusion
Properly adjusting the limit screws on your Campagnolo Record 12s [paid link] Disc Brake system is essential for achieving optimal braking performance and longevity. By following the steps outlined in this guide, you can ensure your bike’s brake system functions smoothly, offering reliable stopping power when you need it most. Always take the time to perform regular maintenance and inspections to keep your components in top condition.