Brake Discs

The mechanical and thermal stresses acting on the brake disc are extremely high. So it’s important they’re up to the job, and perform just as intended. Like all of our braking products, our discs are made to mirror the OE. So whatever the technology, you can be assured that every Delphi disc has been designed, engineered and manufactured to provide the very best braking performance. Just like the OE. Be it coated, cross drilled or high-carbon…it’s a given.

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ECE R90 certified brake discs

It should come as no surprise that our brake discs for new vehicles launched post 1 st November 2016 are R90 certified, alongside a range for popular older applications. After all, we’ve been meeting these quality standards for many years. The only difference today: our discs now undergo official ECE R90 testing schedules including performance, dynamic friction comparison, high load integrity and thermal fatigue analysis to certify that they perform to a prescribed tolerance of the OE part.

Learn more about Delphi’s R90 certified brake discs and why it matters.

Fully coated brake discs

Thanks to a special zinc-flake, silver Geomet coating, our coated brake discs offer greater and longer-lasting corrosion protection compared with many oil-dipped or partially painted and coated equivalents, whilst also being more cosmetically appealing. And because they have no oil to clean off, they save valuable labour and service time. All this makes for a better protected disc that’s easier to install, easier to dismount as well as being easy on the eye too.

High-carbon brake discs

The added carbon content in our high-carbon discs helps to both reduce the risk of thermal cracking under high-temperature loads, and allows the discs to operate at a cooler temperature, for a more consistent braking performance. It also increases their resistance to distortion or warping for added durability, while delivering noise and judder free braking.

Cross-drilled brake discs

As well as looking cool from behind your wheels, our cross-drilled discs will keep your brakes feeling the same way – cool. The cross-drilled holes dissipate heat, brake dust and gases, helping to keep the pad surface cool and clean and reducing the risk of thermal distortion and warping. These same holes also prevent a film of water forming during wet conditions for improved braked response.

Vented brake discs

Our vented discs feature special internal cooling passages to maximise airflow. By continually moving air across the disc’s surface or through the disc itself, they allow more heat to be dissipated, improving both cooling capacity and resistance to cracking from thermal shock.

Brake discs with bearings

To avoid damage to the bearing during removal, and ensure the correct pressing in into the new, we offer a range of discs with these safety critical components already pre-mounted. They also include both toothed and magnetic ABS sensor rings, as per the OE, and the relevant fixing accessories. All for quick and accurate installation.

One-piece cast iron brake discs

Our one-piece cast iron discs offer an aftermarket alternative to BMW’s patented two-piece bi-metallic composite disc. Engineered from a single piece of cast iron, they deliver the same standards of consistency, longevity and braking performance as the two-piece disc, but at a fraction of the price. And to top it off, they come with fixing screws for quicker and easier fitting.

The Delphi Difference

100 years of OE experience, supplier to the world’s top automakers
OE heritage and knowledge built into every aftermarket part
Comprehensive portfolio for a wide range of vehicles and model years
Streamlined SKUs for easy inventory management
Support through tools, tips and training

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Braking 2 min read

Coated brake discs. They’re not all the same!

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Braking Coated disc How it works Distributors DIYers Drivers Shop Owners Technicians 2 min read

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In this article, you will find out about coated brake discs and we discuss why not all coated brake discs are the same.

Given their makeup, cast iron brake discs are susceptible to corrosion from road salt, dirt and water. Many brands claim to offer protection from the elements, but just like the coats we wear – regular, showerproof, storm-proof - there are many different options, each offering different levels of defence. Whilst each brand will market these coatings differently, they can be broadly categorised as – plain, painted, partially coated and fully coated – based on the material used and how and where it is applied.

Plain is, well plain, and offers no corrosion protection. After all it’s plain cast iron and therefore open and vulnerable to anything the road throws at it. Painted, is just that – a thin layer of paint. And whilst this may look great initially, it is effectively just a disguise (as you’ll come to see later!). Just like when you paint a wall at home - any spills or knocks will quickly ruin the effect. Partially coated discs offer some protection, however contaminants, especially salt spray during winter months, can quickly and easily penetrate any unprotected surfaces and eat away at the disc. Which leaves us with fully coated – the approach we take at Delphi.

Why? Because we want to ensure your discs not only look as good as new for as long as possible, but also perform that way too. So we apply a thin layer of a high performance, water and zinc flake based Geomet coating to our discs. We also coat the entire surface of our discs including the top hat, outer rim, internal veins and friction faces. By choosing the best of everything – material and coverage – our fully coated discs offer longer-lasting corrosion protection compared with many painted or partially equivalents, whilst also looking great from behind your alloys. What’s more, because they have no oil to clean off, they’re easier to both dismount and install, saving valuable labour and service time.

So now you know the difference! But what does this really mean in terms of corrosion protection? In a word - a lot! To prove it, independent salt spray corrosion resistance tests were performed on the Delphi disc, the OE equivalent, and five premium aftermarket brands – all fitted to a popular PSA application. The results speak for themselves…

After only 24 hours, the OE - a plain disc - and a premium black painted disc had suffered complete corrosion and were withdrawn from the test. The Delphi disc, on the other hand, showed moderate red ferrous corrosion in only a few areas, and continued to perform strongly.

Fast forward to the end of the test, and at 720 hours, our disc was still less corroded than both the OE and the black painted equivalent at just 24 hours, despite having endured some 700 hours of additional intense salt spray exposure. This is the equivalent of many, many more hours in real-world driving conditions.

So remember, coated discs are not all the same - different brands offer different options with varying degrees of, sometimes huge gulfs in, the protection they offer. That’s why we recommend fitting a fully coated disc such as Delphi’s…a proven long-lasting disc, that’s easier to install, easier to dismount as well as being easy on the eye too.