Rear Brake Disc for Toyota Corolla

The part number 4243102170 is an authentic Toyota OEM part code designed for the rear brakes of Corolla models. It fits a wide range of chassis variants, including the E170 and E180 series Corollas, as well as the platform-sharing Levin and overseas Auris models. It is directly compatible with nearly all vehicles equipped with solid rear brake discs.

When inspecting the disc, check these critical dimensions first: a disc diameter of 259mm, a thickness of 10mm for new discs, a minimum wear limit of 8.5mm, a bolt circle diameter of 5×100, and a center bore of 62mm. Measuring these figures with a caliper will show they match the original factory specifications exactly. No shims or spindle modifications are required, as the disc mounts perfectly to the factory mounting points.

We use premium, uncompromising material for these discs: pearlitic gray cast iron G3000 sourced straight from blast furnaces, with a tensile strength consistently above 250MPa and fine, evenly distributed graphite throughout the friction surface. As our senior quality inspectors note, this material maintains a stable friction coefficient ranging from 0.35 to 0.42 during sustained high-temperature braking, effectively preventing brake fade.

Additionally, each disc undergoes stress-relief tempering followed by natural aging, resulting in minimal deformation. This is why vehicles fitted with these discs exhibit no steering wheel vibration or rear axle shudder at highway speeds.

Most export business owners have encountered this headache: ordinary brake rotors coated with a single layer of black paint will develop rust spots all over the flange edges after a 30 to 40-day sea shipment to the destination port upon container unpacking. Customers will reject the goods, and you cannot afford the round-trip freight losses. Our 4243102170 brake rotor features an upgraded dual-layer composite anti-corrosion coating process, which serves as its core differentiating selling point compared with generic products on the market.

First Layer: Water-based Epoxy Zinc-rich Primer (Cathodic Active Protection)
Prior to coating, sandblasting roughening treatment of Sa2.5 grade is performed on the flange mounting surface and hub fitting surface, with surface roughness controlled within 45–70μm. This thoroughly removes casting scale, oil stains and impurities, ensuring coating adhesion of no less than 5MPa and achieving Grade 0 cross-hatch test results with no peeling. The dry film of the primer contains ≥78% zinc powder. Based on the electrochemical protection principle of sacrificial anodes, the zinc layer oxidizes preferentially to shield the cast iron substrate from rust even if minor bumps and damages occur to the coating during transit. Neutral salt spray testing conducted in accordance with ASTM B117 standard delivers 1000 hours of performance without blistering or red rust, enabling reliable protection in highly corrosive coastal environments.
Unlike traditional solvent-based primers, our fully water-based formula achieves surface dryness in 2 hours and full curing in 8 hours, boosting workshop coating production capacity by 50%. Moreover, it contains no heavy metals such as lead and cadmium, complying with the EU REACH environmental control regulations. Shipments will not be detained by environmental inspections during customs clearance in Europe and Australia, making it ideal for large-volume cross-border orders.

Second Layer: Weather-resistant Acrylic Polyurethane Topcoat
The topcoat is evenly sprayed only after the primer is fully cured, with the total dry film thickness maintained at 70–80μm to form a dense physical barrier that isolates corrosive elements including sea mist, road de-icing salts and acid rain. The topcoat boasts outstanding high-temperature resistance: it will not peel or discolor under short-term high temperatures of 200°C generated during daily braking, and the coating will not chalk after two years of long-term outdoor storage.

We also incorporated a highly practical detailed design: full coating is only applied to the flange mounting base and non-friction working surfaces, while the friction braking surface remains completely bare with no coating. Repair shops do not need extra sanding and paint removal during installation, cutting assembly time. This design also eliminates early-stage braking squeals and weak braking force common with new rotors, striking a perfect balance between anti-rust performance and convenient end-user installation.

All dimensions and performance data are strictly calibrated and manufactured in accordance with industry standards.

This rear brake disc is applicable to multiple vehicle models with stable compatibility and accurate fitting size. The detailed applicable models are listed below:

This product corresponds to a variety of mainstream brand part numbers and OE codes, which can perfectly replace the original parts. The detailed cross-reference information is as follows:

This rear brake disc part number 4243102170 for Toyota Corolla is entirely manufactured at our in-house brake component production base in Laizhou, Shandong Province. We outsource no production work to external manufacturers and exercise independent control over every process from casting blanks to finished product delivery. Our factory holds the IATF16949 automotive parts quality management system certification, and the products also come with E-mark R90 export certification. Auto parts wholesalers in Europe and the United States can list them for sale directly without additional product qualification audits.

Automated Static Pressure Casting Workshop for Consistent Blanks

We have phased out outdated manual clay sand molding and adopted fully automatic cold box static pressure molding production lines with constant pouring pressure for each mold. Every batch of GG25 cast iron molten metal undergoes real-time pre-furnace spectroscopic composition testing. Blanks with excessive carbon or sulfur content are scrapped on the spot to prevent unqualified castings from entering machining procedures. After forming, all blanks receive a uniform 4-hour stress-relief annealing treatment to completely eliminate internal casting stress. This prevents warpage and deformation during high-speed braking later on, solving the common issue of severe vibration plaguing low-cost brake discs after only a few thousand kilometers of use.

CNC Precision Machining Workshop with Micron-Level Tight Tolerance Control

The workshop is fully equipped with double opposing-spindle CNC lathes that machine both upper and lower friction surfaces in a single clamping setup, eliminating positioning errors caused by repeated re-clamping. The surface roughness Ra of the disc is controlled between 1.6 and 3.2 μm, delivering an ideal friction coefficient match with Japanese semi-metallic and ceramic brake pads. Centering holes and bolt mounting holes are finished via integrated reaming, with a hole diameter tolerance of ±0.03 mm. The discs fit perfectly with original Corolla wheel bearings without any clearance, offering mounting compatibility comparable to OEM rotors.

Each machine is fitted with an on-line SPC data acquisition system that transmits dimensional, thickness and runout data to the backend in real time. Equipment automatically shuts down and triggers alarms if tolerance deviations occur, avoiding mass production of defective goods.

Three-Stage Full Inspection Process for Fully Traceable Quality

1. First inspection: Random sampling of incoming blanks to test metallographic structure and hardness, removing castings with substandard material properties.

2. Second inspection: After machining, every single 4243102170 brake disc undergoes separate tests for dynamic balance, thickness and lateral runout. Each disc is assigned a unique inspection number to trace its production batch and melting furnace batch.

3. Third inspection: Random sampling after coating for salt spray testing and surface coating examination. Non-conforming products are sent for rework immediately and never mixed into finished product cartons.

Brake discs are safety components. The biggest worry in foreign trade is endless after-sales disputes, which often result in zero profits and damaged business reputation. That's why we spare no effort on packaging: each single disc is first wrapped with anti-rust film, fitted into custom EPE foam holders, then packed into five-layer reinforced corrugated export cartons with paper corner protectors installed on all four outer corners of each carton. When loading onto pallets, cross strapping is applied both horizontally and vertically. Even after over 30 days of bumpy ocean transportation, the discs arrive at the port free of edge dents or chipping once the cartons are opened.

Regarding after-sales service: For part number 4243102170, if third-party testing confirms abnormal wear or brake vibration caused by casting porosity or material defects, we will immediately replace the entire batch or issue a full refund as you request, covering all round-trip shipping costs at our own expense. When used with matching brake pads, the product warranty lasts 12 months or 30,000 kilometers from the vehicle installation date. In cases of uneven braking or squealing noises, we provide remote video troubleshooting to identify the root cause of even the smallest issues.

Our technical team also offers an extra complimentary service: simply send us the vehicle identification number (VIN) and photos of your old brake discs, and we will proactively check the corresponding OE numbers, brake pad compatibility, and sensor matching for you. We value long-term partnerships above short-term sales, so feel free to reach out for inquiries at any time.

Q1: Which model years and chassis variants of Toyota Corolla are compatible with this rear brake disc with OE part number 4243102170?
A: It is primarily compatible with the 1.2T and 1.6L gasoline variants of Toyota Corolla built on E170 and E180 chassis platforms. It also fits the rear axle of Auris E18 which shares the same platform. Before installation, simply verify that the original vehicle's OE number is 4243102170 for direct replacement. No wheel modification or caliper bracket replacement is required. The rear wheel's 5-hole 114.3mm pitch circle matches perfectly, eliminating risks of misalignment or caliper interference during fitting.

Q2: The original rear brake discs of Corolla tend to rust easily. With your dual-layer coating process, can these discs withstand transoceanic sea freight and daily use in coastal cities?
A: Absolutely. The high-zinc primer delivers active electrochemical rust protection, while the topcoat forms a physical barrier layer. No rust spots will develop even after 40 days of sealed container shipping under standard conditions. For end users residing in coastal areas, the flange base will not develop extensive red rust within 2 years of regular use; only minor surface rust will form on the friction surface, which is normal. Compared with conventional single-layer painted brake discs, its anti-rust service life is more than tripled.

Q3: This 4243102170 brake disc is a solid rotor. Does it dissipate heat worse than ventilated front discs, leading to brake fade during frequent stop-and-go traffic?
A: The rear axle only bears around 30% of the total braking force of a Corolla, and the original factory rear axle is engineered with solid discs. Our discs are cast from GG25 high-carbon cast iron, which boasts superior thermal conductivity to standard grey cast iron. Brake fade will never occur during daily urban commutes or highway cruising. For frequent mountain driving or heavy-load scenarios involving repeated hard braking, pairing these discs with low-metallic, high-thermal-conductivity brake pads is recommended to further enhance braking stability.

The most notable shift across the entire brake after-sales industry lately is the rising environmental standards for coatings. Several European distributors have set heavy metal-free electrophoretic brake rotors as a mandatory entry requirement. Qualified products like our part 4243102170 receive far more inquiries than unbranded alternatives finished with black spray paint.

Another emerging trend is providing technical packages with every rotor purchase. If you run retail stores on Amazon or eBay, separately highlight the OE number 4243102170 in your product listings, paired with physical installation videos and vehicle fitment charts. This approach delivers a much higher conversion rate than simply labeling the item "Corolla Brake Rotor" - one of our clients has successfully implemented this strategy, boosting their CVR by nearly 15%.

Here's a handy tip for checking vehicle compatibility on your phone instead of relying on memorization: download TecDoc, enter "4243102170", and the system will instantly pull up all matching models including Corolla, Levin, Allion and Auris, complete with model years and engine displacements, drastically cutting down the rate of incorrect shipments.

Lastly, a quick method to instantly judge product quality: do not only inspect the rotors upon delivery. Unpack them and smell the surface. Pungent odors usually indicate solvent-based spray paint. Our electrophoretic coating emits no harsh fumes, featuring a matte black rotor surface with subtle orange peel texture - this distinct finish is easily recognizable to industry professionals.

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