PRODUCTS
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1. Application & Related Brake Parts
The Sinotruk Z4 Air Disc Brake Caliper Assembly is a replacement component for compatible Sinotruk HOWO and SITRAK heavy-duty truck pneumatic disc brake systems.
The Z4 brake caliper transfers force from the air brake chamber through its internal actuation mechanism, pressing the brake pads against the rotating brake disc to generate braking friction.
The assembly is intended for matching Z4 brake configurations used in compatible heavy-duty truck axle systems.
Related components include brake discs, brake pads, air brake chambers, brake caliper carriers, guide pins, brake adjustment mechanisms, mounting bolts and caliper repair kits.
2. Fitment Confirmation Before Order
Buyers should confirm the original Sinotruk Z4 brake model, complete part number, axle identification and caliper structure before purchasing.
Important specifications include brake disc diameter, brake disc thickness, compatible brake pad shape, mounting hole spacing, brake chamber interface and installation side.
Different Sinotruk truck models and axle versions may use different Z4 brake assemblies. Left-side and right-side calipers must be selected according to the original installation configuration.
Z3 and Z4 brake caliper assemblies should not be considered interchangeable without confirming their specifications.
Please also confirm whether the order requires the complete brake caliper assembly, caliper body, mounting carrier or additional repair components.
3. Suitable Buyer & Supply Use
This product is suitable for heavy-duty truck spare parts importers, wholesalers, brake repair workshops, fleet maintenance companies and aftermarket distributors.
WOPU supports combined purchasing of Z4 brake calipers, brake discs, brake pads, brake chambers, caliper carriers, adjustment mechanisms and other compatible Sinotruk braking system components.
Our advantages include:
Full range heavy-duty truck spare parts supply
Support for bulk wholesale and mixed container orders
Part number, photo and sample confirmation service
Neutral package and customized package available
Export experience for Africa, Middle East, South America, Southeast Asia and Central Asia
Flexible shipping solutions by express, air and sea
Long-term cooperation support for importers, wholesalers, repair shops and fleet maintenance buyers



------>Q1. How can I confirm the correct truck parts before ordering?
Please provide the part number, truck model, axle model, engine model or transmission model. If the part number is unavailable, you can send us product photos, dimensions, nameplate information or samples. Our team will check the details with you before confirming the order to reduce matching errors.
------>Q2. Can I purchase different truck parts in one order?
Yes. WOPU supplies a wide range of heavy-duty truck parts, including axle, chassis, transmission, engine and cab components. We support mixed-product orders and consolidated shipments, helping repair shops, wholesalers and importers reduce purchasing time, shipping costs and supplier management work.
------>Q3. What is your minimum order quantity?
The MOQ depends on the product type, weight, packaging method and stock availability. Small trial orders are available for many stocked items, while more competitive pricing can be offered for wholesale and container orders. Please send us your purchasing list for a detailed proposal.
------>Q4. How do you control product quality?
We check key specifications, dimensions, materials, appearance and packaging according to the requirements of each product. Photos or videos can be provided before shipment when required. For large or customized orders, samples can also be confirmed before batch production.
------>Q5. Can you provide samples before a bulk order?
Yes, samples are available for many products. If the item is in stock, we can arrange it after confirming the sample and courier costs. For customized products, sample preparation time and charges will be evaluated according to the drawing, sample or technical requirements.
------>Q6. Do you support OEM, ODM and customized packaging?
Yes. We support product development based on samples or drawings, as well as customized dimensions, materials, markings, labels and packaging. WOPU packaging, neutral packaging and authorized customer-brand packaging are available according to order quantity and product requirements.
------>Q7. How do you quote prices, and what payment terms do you accept?
Prices are calculated according to the part number, quantity, quality level, packaging and delivery terms. A detailed quotation will be provided after we review your purchasing list. Common payment methods include T/T and L/C, with payment terms confirmed according to the order value and cooperation conditions.
------>Q8. What are your delivery and after-sales arrangements?
Delivery time depends on stock availability, order quantity and customization requirements. We can arrange consolidated shipment through Qingdao, Tianjin, Shanghai or Guangzhou. If any product issue occurs, please provide photos, videos, quantities and package labels, and our team will review the case and offer an appropriate solution.
To learn more about our products, please leave your email and we will contact you within 24 hours.



