Brake Discs
![delphi-brake-disc](/images/default-source/theme/foximages/delphi-brake-disc.tmb-460w.jpg?Culture=en-GB&sfvrsn=48dd4a80_46)
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.
![ECE R90 certified brake discs](/images/default-source/parts/parts/ece-r90-certified-brake-discs.jpg?sfvrsn=381358d0_5)
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.
![Fully coated brake discs](/images/default-source/parts/parts/fully-coated-brake-discs.jpg?sfvrsn=1c09e166_1)
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.
![cross-drilled brake discs](/images/default-source/parts/parts/cross-drilled-brake-discs.jpg?sfvrsn=88f3b0b4_1)
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
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100 years of OE experience, supplier to the world’s top automakers
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OE heritage and knowledge built into every aftermarket part
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Comprehensive portfolio for a wide range of vehicles and model years
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Streamlined SKUs for easy inventory management
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Support through tools, tips and training
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Related product resources and downloads
![How to diagnose warped discs 1920x1080](/images/default-source/theme/masters-of-motion/how-to-diagnose-warped-discs-1920x1080.tmb-1920w.jpg?Culture=en-GB&sfvrsn=84fefc51_35)
Resource Highlights
Can new brake discs be supplied warped?
Modern manufacturing processes and materials make warped discs out of the box extremely rare. If there is braking vibration or other symptoms, this could be caused by Disc Thickness Variation (DTV) or runout.
What is Disc Thickness Variation (DTV)?
Both the front and rear face of the brake disc should be flat and be in parallel with one another. Nothing is perfect, but they should be flat within a tight tolerance. If you were to measure around the face of the disc at different points and find that it measures differently in thickness (meaning that it’s not perfectly flat and not parallel), that is DTV. Manufacturers will stipulate varying tolerances for this in the vehicle handbook. A high DTV measurement could cause a common misdiagnosis of a warped disc.
How do you measure DTV?
Use a vernier caliper to measure the thickness between the front and rear faces of the disc in different areas. If there are any differences in the thicknesses, this is Disc Thickness Variation (DTV).
What is the difference between DTV and a warped brake disc?
Whereas Disc Thickness Variation (DTV) is caused by the disc wearing unevenly (causing the faces of the disc to no longer be parallel with one another), a warped disc is a distortion within the uniform thickness of the disc surface.
What is the difference between DTV and runout?
DTV is when the faces of the brake disc are not flat. Runout is a measure of how off-centre a brake rotor is as it rotates around the hub. If the hubs aren’t clean from dirt or debris, then this can cause runout and braking vibration. If they are clean, then the bearings or hub may be faulty.
How do I carry out a disc runout check?
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Visit our Technician Library for access to Documents and Downloads
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