Brake Disc Buying Guide
Last updated: February 2026 · 6 min read
Brake discs are the large metal rotors behind your wheels that your brake pads clamp onto to slow the car down. Unlike pads, which are a cheap consumable, discs are more substantial components — but they still wear out and need periodic replacement. This guide explains when they need changing, the different types available, and how to get the best value.
When Do Brake Discs Need Replacing?
Every brake disc has a minimum thickness stamped on it (usually on the hub area or edge). Once the disc wears below this measurement, it's no longer safe and must be replaced. You can measure this with a micrometer or vernier caliper, but there are visual signs too: a pronounced lip around the outer edge of the disc, deep grooves or scoring across the surface, visible cracks, or excessive rust that doesn't clear after a few brake applications.
Brake pedal vibration or pulsing — sometimes called disc run-out or warping — is another common reason for replacement. This happens when the disc surface is no longer perfectly flat, causing the pads to push the pedal back as they ride over the high spots. While discs can sometimes be skimmed (machined flat again), this is only possible if there's enough remaining thickness, and the cost of skimming often approaches the cost of new budget discs, making replacement the more sensible option for most cars.
Types of Brake Disc
Solid Discs
A single slab of cast iron. Used on the rear brakes of most small and medium cars, and on all four corners of some city cars. They're cheaper and simpler but retain more heat than vented discs. Perfectly adequate where braking demands are lower.
Typical UK price: £15–£35 each
Vented Discs
Two layers of cast iron separated by internal cooling vanes that allow air to flow through the disc. This dramatically improves heat dissipation, reducing the risk of brake fade during heavy or repeated braking. Standard on the front brakes of virtually all modern cars, and on all four corners of heavier or more powerful vehicles. Always replace a vented disc with a vented disc — never substitute a solid one.
Typical UK price: £25–£65 each
Drilled and Grooved Discs
Performance discs with holes drilled through them (drilled), slots machined into the surface (grooved), or both. The holes and grooves help channel away water, gas, and dust, maintaining pad contact. They look impressive behind alloy wheels and offer marginal improvements in wet weather and under hard braking. However, for normal road driving the difference over standard vented discs is minimal, and drilled discs can develop cracks around the holes over time. Best suited to enthusiast drivers and track days.
Typical UK price: £45–£120 each
Getting the Right Size
Brake disc sizes vary significantly between models and even between variants of the same model. A Ford Focus with a 1.0 EcoBoost has smaller discs than one with a 2.0 TDCi because the heavier, faster car needs more braking capacity. Many cars also had different disc sizes depending on the trim level or options fitted. The only reliable way to get the correct disc is to match your exact vehicle specification — registration plate lookup is the easiest way to do this.
Key measurements are the outer diameter, thickness, and the number and pattern of bolt holes on the hub mounting. Some cars also have different centre bore sizes. If in doubt, remove the old disc and measure it, or compare the part number stamped on it with the new disc.
Brand Guide
Brembo is the most recognised brake disc brand globally, supplying OEM to Ferrari, Porsche, Mercedes, and many others. Their aftermarket discs for everyday cars are excellent — they're coated to resist corrosion, precisely manufactured, and come with a protective UV coating that makes them look good behind open-spoke alloys. Premium priced but genuinely superior.
ATE (owned by Continental) is the OEM supplier for many European manufacturers including VW, BMW, and Volvo. Their discs feature a distinctive coating on the non-swept areas that prevents unsightly rust. Very popular with UK garages and an excellent choice for German cars in particular.
TRW (owned by ZF) is another major OEM supplier with wide UK coverage. Good quality discs at slightly lower prices than Brembo and ATE. TRW discs are a solid mid-range choice and are widely stocked by UK motor factors.
Mintex, Pagid, and Eicher are popular budget-to-mid-range brands. Mintex in particular has a long UK heritage (they're based in Yorkshire) and offers good quality at competitive prices. For everyday driving, these brands provide perfectly adequate performance.
Fitting Tips and Costs
New brake discs should always be fitted with new pads — bedding old pads onto new discs (or new pads onto old discs) prevents proper contact and reduces braking effectiveness. After fitting, new discs and pads need a bedding-in period of around 200 miles of gentle braking to allow the pad material to transfer a thin layer onto the disc surface. Avoid heavy braking during this period.
Fitting a pair of front discs and pads typically costs £50–£120 for parts (discs + pads) and £60–£120 in labour, so £110–£240 total per axle at an independent garage. Rear discs are usually cheaper because they're smaller. Main dealer prices are typically 50–100% more. This is one of the most straightforward jobs for a competent home mechanic with a jack, axle stands, and basic tools.
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