Give yourself a brake.

With fall rain on the way, your brakes are the most important safety system on your bike. This week's maintenance tip covers the three key areas of brake health: pad wear, rotor condition, and hydraulic fluid bleeding.

1. Brake Pad Inspection

Brake pads wear down gradually, and it's easy to miss until performance drops noticeably. Here's what to check:

• Minimum thickness: Most pads have a wear indicator groove. If the groove is gone, it's time to replace them. As a general rule, replace pads when the compound is less than 1–1.5mm thick.
• Contamination: Oil, chain lube, or grease on pads causes glazing and dramatically reduces stopping power. Contaminated pads usually need to be replaced — solvents rarely fully restore them.
• Uneven wear: If one pad is wearing faster than the other, your caliper pistons may need cleaning or the caliper may need realignment.

Tip: Always replace pads in pairs, and bed in new pads properly before your next big ride.

2. Rotor Wear and Condition

Rotors take a beating over a season of riding. Check yours for these signs of wear:

• Minimum thickness: Rotors are stamped with a minimum thickness (typically 1.5mm–1.8mm depending on brand). Measure with a micrometer or bring your bike in — riding on a worn rotor is a safety risk.
• Warping: A pulsing feeling when braking usually means a warped rotor. Minor warps can sometimes be trued; significant warps require replacement.
• Scoring and grooves: Deep grooves from worn pads accelerate rotor wear and reduce braking consistency. If you can feel grooves with your fingernail, it's time for a new rotor.
• Discolouration from overheating: Blue or purple tinting on a rotor is a sign it has been subjected to excessive heat — common after long descents or heavy braking. An overheated rotor can warp, lose temper, and become brittle. If you notice significant discolouration, have the rotor inspected before riding hard again. Paired pads should also be checked, as overheating often glazes or damages the compound.
• Cracks: Any cracking near the rotor's braking surface means immediate replacement — no exceptions.

3. Hydraulic Brake Bleeding

Hydraulic disc brakes use mineral oil or DOT fluid to transfer force from lever to caliper. Over time, the fluid absorbs moisture and degrades, leading to a spongy lever feel and reduced braking power.

• When to bleed: If your lever feels spongy, pulls closer to the bar than usual, or you notice inconsistent braking, a bleed is likely overdue. Most hydraulic systems benefit from a bleed once a season or every 1,000–2,000km.
• Mineral oil vs. DOT fluid: Know which your system uses — they are not interchangeable. Shimano and most Magura systems use mineral oil; SRAM, Avid, and Hayes use DOT fluid. Using the wrong fluid can damage seals.
• DIY or shop bleed: Bleeding brakes at home is doable with the right kit, but it's easy to introduce air bubbles if you're new to it. If you're unsure, bring your bike in — a professional bleed takes about 20–30 minutes per brake.

4. Is It Time for a Brake Upgrade?

Sometimes maintenance isn't enough — especially if your brakes were entry-level to begin with. Ask yourself:

• Do you have enough stopping power? If you're pulling the lever hard and still not stopping as quickly as you'd like, your brakes may simply be underpowered for your riding style or terrain. This is especially common on heavier e-bikes, loaded touring setups, or bikes used for technical descending.
• Are you constantly fighting fade? Repeated overheating and discolouration despite proper technique is a sign your system is working beyond its limits.
• Are your rotors undersized? Larger rotors (e.g., moving from 160mm to 180mm or 203mm) provide significantly more heat dissipation and leverage, improving both power and modulation.
• Are you on mechanical disc brakes? Upgrading to hydraulic brakes is one of the most noticeable performance improvements you can make — better feel, more power, and less hand fatigue on long rides.

Not sure if an upgrade makes sense for your setup? Come talk to us at Brentwood Cycle. We'll assess your current brakes, your riding style, and your budget — and give you an honest recommendation.

When to Come In

Not sure where your brakes stand? Stop by Brentwood Cycle for a quick brake inspection. We'll check pad thickness, rotor condition, and lever feel — and let you know exactly what your bike needs before the wet season hits.

Riding with confidence starts with brakes you can trust.