Brake Disc and Pads: The Complete Cyclist’s Guide

Your brake disc (rotor) and pads work together to stop your bike safely. Over time, pads wear down and rotors can glaze or groove, reducing power and control. This guide helps you spot wear, choose the best pads for your riding, and fit them correctly so you get quiet, confident stopping.

What are brake discs and pads?

On a bicycle disc brake, the disc (rotor) is the steel ring attached to your hub. The pads are friction blocks that clamp the rotor inside the caliper. When you pull the lever, hydraulic (or cable) force pushes the pads against the rotor to create controlled friction.

Do brake discs and pads need replacing together?

Not always. If your rotor is within thickness spec, runs true, and isn’t deeply scored, you can replace pads only. Replace the rotor if it’s below minimum thickness, cracked/warped, or has ridges you can catch with a fingernail. New pads on a badly worn rotor will be noisy and underpowered.

7 signs your brake disc or pads need replacing

1. Squeal or howl: Glazed pads/rotor or contamination.
2. Vibration/judder: Uneven pad deposition or bent rotor.
3. Longer stopping distances: Worn pads, wrong compound, or oily rotor.
4. Visible scoring: Deep grooves on rotor.
5. Use the manufacturer’s pad wear limit: Shimano 0.5 mm friction material; SRAM 3 mm including the backing plate.
6. Spongy lever: Inspect for leaks, air, damage and setup faults. A pad upgrade does not repair the hydraulics. Stop riding if the lever reaches the bar or braking is unreliable.
7. Persistent wet noise: Consider a pad with better wet performance.

How to choose the right pad compound

How to replace disc brake pads (step by step)

1. Shift to an easier gear, put bike in a stand, remove wheel.
2. Push pistons back gently with a pad spreader (never on rotor).
3. Undo pad pin/clip and slide pads + spring out.
4. Clean rotor and caliper with isopropyl alcohol.
5. Insert new pads + spring, secure pin/clip.
6. Reinstall wheel, squeeze lever, and centre caliper.
7. Spin wheel, check for rub, confirm firm lever feel.

Bedding in: quick method

Make 10 to 20 controlled stops from moderate speed to a crawl (don’t fully stop). Allow brief cooling between sets. This lays down a film on the rotor for maximum power and reduced wet noise.

Eco & compliance

• Brake Pad Recycling Program: Send us your used pads for recycling.
• REACH compliant: All pads are made with eco friendly materials and packaging.

FAQ: Brake Disc and Pads

How often should I replace pads? Inspect regularly. Shimano specifies 0.5 mm of friction material; SRAM specifies 3 mm or less including the backing plate. Replace damaged or contaminated pads and follow the exact brake manual.

Do I need to replace the rotor with the pads? Check its marked wear limit, condition and compound compatibility. Follow the manufacturer’s instructions when switching compounds; SRAM recommends a new rotor for a compound change.

What’s the difference between a disc and pads?
Disc = steel rotor on the hub. Pads = friction blocks that clamp it.

Which pads are best for wet rides?
Enduro Pro Semi Metallic offer excellent wet control with low noise.

Will Gorilla Brakes pads fit my bike? Match the exact caliper code and generation to the individual product’s fit list, then confirm rotor and compound approval. A brand name alone does not establish compatibility.

Are brake pads recyclable?
Yes, use our Recycling Program.

Why Upgrade to Galfer Disc Rotors?

Galfer rotors are engineered for riders who want more than just stopping power, they want performance, heat management, and silence. Whether you’re racing down alpine descents or commuting in all weather, Galfer’s Wave and Shark rotors are a serious upgrade.

Confirm the exact Galfer rotor diameter, thickness, mount, braking track and compound compatibility for your brake, frame and fork. A brand name alone does not establish fit with every Gorilla pad.