Brake Pads at Service Time: The Practical Replacement Guide

Brake pads have a simple, definite end of life: friction material wears down to a marker thickness or a wear sensor triggers a warning light. The decisions around pads are less about whether to replace them and more about what to fit in their place. Which friction grade? Which brand? Same pads front and rear, or different? Same friction compound as before, or change to a different family? This guide walks through the practical choices at a typical UK service.

Reading wear

Most UK cars now have a wear indicator — either a metal scraper that contacts the disc when material wears to around 3mm (and produces a squealing noise on every brake application), or an electrical sensor in one pad that breaks circuit and lights the dashboard wear warning. The warning indicates the pad has reached its safe minimum; replace soon, not "at the next service in six months."

Visual inspection through the wheel spokes gives you an early read. New pads are 11–12mm thick. Around 4–5mm, you’re at the half-life point. Around 2–3mm, replacement is imminent. Below 2mm, the metal backing is close to the disc and immediate replacement is needed — running on metal backings damages the discs in minutes.

Choosing the friction grade

All road-legal pads in the UK carry R-90 type approval. Above that floor, friction grades differ in three properties: cold bite (how the pad responds in the first few seconds of use), high-temperature fade resistance (whether the bite drops off after several hard stops), and dust output (how much black dust appears on the wheels between car washes).

Premium pads (Textar, Pagid, ATE, Brembo) score well on all three. Mid-market (Mintex, APEC Black, First Line) trade some fade resistance for cost. Budget (Abtex, Don, Key Parts) trade fade resistance and dust output but meet the R-90 floor. For a daily-driven UK family car, mid-market is the rational answer.

Front vs rear — different jobs

The front brakes do roughly 70% of the work on most cars. Front pads wear faster, are larger, and use harder compounds. Rear pads wear more slowly and use softer compounds. Don’t mix-and-match front and rear pad brands across a single service unless you’re consciously stepping up one end (typical reason: front-only premium pads for better feel without committing to a full premium set).

The seized-caliper trap

One of the most common UK brake mistakes: fitting new pads to seized rear calipers. The new pads then wear unevenly within months, one side wears down to metal while the other is still half-thickness, and the customer complains about quality. The fix is to inspect the rear caliper sliders at every pad change — if the slider is stuck in or doesn’t move freely, clean and re-grease (or replace the slide pins and boots) before fitting new pads.

Bedding in new pads

Fresh friction material needs a controlled break-in to transfer a thin layer of pad material to the disc. Over the first 100 miles, do 20–30 moderate stops from 40–50 mph down to 10 mph, allowing the brakes to cool between each. Avoid any single hard emergency stop in this period — it can leave an uneven pad deposit on the disc that produces lifelong judder.

When to replace pads and discs together

Always, if the discs are at minimum thickness, scored, lipped or pitted. Optional, if discs are clean and within minimum. Doing both together saves labour cost. Doing pads only and waiting on discs spreads the cost.

Find brake pads confirmed to fit your car on the Brake Pads collection. The pad is what your brake pedal feels — choose accordingly.