Within high-performance chassis systems, the part identifier 43019-SO4-003 represents more than a stock code—it stands as a hallmark of safety-critical manufacturing precision. As global markets transition toward tighter braking tolerances and lightweight automotive components, obtaining calipers that conform precisely to this OEM specification is vital for Tier-1 suppliers and direct aftermarket distributors alike.
Wenzhou BIT Automobile Parts Co., Ltd. has developed this technical overview to clarify the metallurgical, chemical, and automated manufacturing architectures required to produce calipers under the 43019-SO4-003 standard. From initial casting to dynamic seal integrity analysis, this report serves as a complete B2B procurement guide.
Founded in 1998 as a small workshop producing automotive components, Wenzhou BIT Automobile Parts Co., Ltd. has grown into a fully integrated manufacturing and trading enterprise specializing in high-quality braking systems. Over the past two decades, we have expanded our product range, enhanced our production capabilities, and established a strong global presence. Today, we are a trusted supplier of brake calipers, repair kits, motors, caliper brackets, brake drum repair kits, and more, serving customers in multiple international markets.
Our story began with a focus on manufacturing precision brake components for the domestic aftermarket. By 2008, we established our own brake caliper factory, enabling us to provide high-quality products to Chinese trading companies. A decade later, in 2018, we founded our international trading arm, marking our official entry into the global market. This strategic move allowed us to engage directly with overseas customers, offering tailored solutions for diverse automotive needs.
By investing in design engineering and metallurgical validation, we manufacture a comprehensive selection of braking components matching or exceeding OEM performance indicators.
Electric Parking Brake Calipers integrated with high-torque electric actuators. Built for modern digital chassis architectures, including regenerative drive systems.
Precision disc calipers engineered for European, American, Japanese, and Korean passenger vehicle platforms, following strict dimensional standards.
Constructed from high-tensile ductile iron, our catalog contains over 50 brackets optimized to handle extreme shearing loads during heavy braking cycles.
Providing over 60 actuator variants with certified gear-train durability, ensuring responsive engagement and release dynamics.
Complete service kits featuring EPDM seals, precision pistons, guide pins, and high-temperature lubricants. Tailored for Japanese and Korean vehicle applications to enable cost-efficient fleet maintenance.
The braking industry is shifting rapidly. As autonomous driving architectures and electric vehicles (EVs) require brake-by-wire designs, Wenzhou BIT is actively steering its research and development toward next-generation solutions.
By transitioning from traditional heavy cast iron architectures toward premium aluminum alloy compounds, we reduce unsprung mass. This improves EV vehicle range and lowers overall carbon emissions during manufacture.
We are merging traditional hydraulic designs with smart electronic actuators, building high-speed feedback loops that interface with vehicle ECUs for micro-second brake response times.
Reducing environmental footprint through zinc-nickel and dry-lubricated surfaces that completely eliminate hexavalent chromium (CrVI), in full alignment with international RoHS and REACH directives.
Each OEM 43019-SO4-003 caliper undergoes a multi-phase production workflow. Once the raw caliper body is cast, it passes through precision Computer Numerical Control (CNC) machining. This critical stage involves:
Our automated systems quickly remove excess material from the raw casting to establish the foundational shape of the caliper housing, managing thermal stresses before detail work begins.
We machine the piston bores, fluid channels, slide-pin guides, and pad retention slots to tight tolerances (within ±0.01mm). This step prevents hydraulic fluid bypass and minimizes uneven pad wear.
Modern fleets and logistics networks operate under diverse and demanding road conditions. Standard aftermarket components often struggle with thermal load peaks, leading to issues like caliper guide-pin binding, seal decay, and premature disc wear. Wenzhou BIT delivers engineered, system-level solutions to address these challenges:
By balancing carbon and silicon ratios in our casting molds, we increase the caliper's thermal dissipation rates, preventing fluid boiling and reducing brake fade under heavy load cycles.
Our multi-layer chromate-free plating stands up to harsh road salts and chemicals, successfully completing over 720 hours of salt spray testing to prevent seizing and structural decay.
Engineered with custom EPDM compound seals to maintain elasticity across a wide temperature range (-40°C to +150°C), protecting against fluid leaks and dust ingress.
Operating out of Wenzhou, China’s automotive component manufacturing hub, Wenzhou BIT leverages advanced automation and localized supply networks. This structural integration allows us to keep lead times short and pricing competitive while maintaining high build quality.
Each caliper is subjected to dual high- and low-pressure pneumatic seal integrity tests before packaging, verifying leak-free operation down to 0.02 bar.
Located near Ningbo and Shanghai ports, our shipping teams handle customs clearing, consolidation, and multi-modal logistics to streamline delivery schedules.
We source iron castings from certified domestic foundries with complete heat traceability reports, ensuring consistent material performance batch after batch.
For B2B buyers, purchasing automotive components requires balancing risk mitigation, compliance, and cost. We structure our procurement workflows to match these requirements:
Our manufacturing and assembly steps are aligned with IATF 16949 processes. We implement continuous statistical process control (SPC) to ensure dimensional stability and part consistency.
For custom production runs or unique OEM numbers, we provide full Production Part Approval Process (PPAP Level 3) documentation, including material test results and dimensional reports.
Our production facilities support both high-volume runs and smaller, mixed batches, helping distributors manage inventory and maintain reliable stock levels.
Braking systems are subject to strict regional safety laws. Wenzhou BIT provides regulatory support to help partners meet local import and safety guidelines.
Our calipers are designed and validated to interface seamlessly with ECE R90 certified brake pads and rotors across Europe, maintaining correct stopping distances and system performance.
We provide comprehensive product data, including detailed material breakdowns and certificate records, to support smooth customs clearance in the US, EU, and Latin American ports.
Our engineering and sales teams communicate clearly in English, helping resolve technical questions, fitment issues, and project requirements without delay.
Please check the catalog using the following process:
1. Click the picture you are interested in (that opens the full PDF catalog for this category).
2. You can find this button at the bottom of the directory.
3. Click the Open Mirror Button to see a clear directory.
4. Click the Search Button to find specific part numbers.
(If you can't find the part in the catalog, please contact us directly.)
Part number 43019-SO4-003 is a rear right disc brake caliper assembly, widely used on Honda vehicle platforms (specifically Honda Civic and CRX models from the late 1990s and early 2000s). It features a single-piston sliding design, typically matching a 30mm or 34mm piston diameter, optimized for balanced hydraulic braking force.
We apply high-integrity electro-galvanization or zinc-nickel alloy plating. These coatings undergo a passivation treatment to protect the caliper body from moisture, road salts, and acids. The surface treatment provides corrosion resistance up to 720 hours in salt spray testing, satisfying standard automotive corrosion requirements.
Yes, we can supply the brake caliper as a bare unit or complete with the mounting bracket. Buying the assembly simplifies installation on the line or in the workshop and helps prevent sliding issues caused by mismatched tolerances.
All seal components are made from high-grade EPDM rubber, which resists degradation under heat and pressure. We run routine pressure-cycling tests on production samples to ensure the seals retain their shape and elastic seal qualities when exposed to standard brake fluids (DOT 3, DOT 4, and DOT 5.1).
BIT Automobile
