Sourcing Guide
Product spotlight for Sinotruk HOWO and Sitrak automatic slack adjusters, with OE number examples, truck model clues and brake parts matching notes.
Automatic slack adjusters are small compared with the axle and brake assembly, but they are important safety-related brake parts. For Sinotruk HOWO, HOWO A7, Sitrak, Haohan and Steyr applications, the right item should be matched by OE number, axle position, left or right direction, spline or tooth count, mounting hole layout and old-part photo.
This product spotlight covers the Sinotruk HOWO / Sitrak automatic slack adjuster replacement direction for buyers preparing repair stock, workshop replenishment or mixed truck spare parts orders.
Two automatic slack adjusters can look similar from the outside, but the internal spline, arm offset, installation side and axle position may be different. A buyer may search for HOWO slack adjuster, Sitrak brake adjuster, Sinotruk automatic slack adjuster or Steyr brake parts, but the final quotation still needs the real part number or old-part details.
For export orders, it is better to send the removed part photo and OE number together. If the old part is still installed, send photos of the axle position and mounting direction. This helps reduce wrong-side or wrong-spline matching before shipment.
The available reference list includes several common Sinotruk-related OE numbers. Use them as matching clues, not as a substitute for final confirmation:
| OE / Reference Number | Application Clue | Before Ordering |
|---|---|---|
| AZ400745400510, AZ400745400511 | Sinotruk HOWO, New Steyr, Haohan, Sitrak and related heavy trucks | Confirm front axle position, spline or tooth count and old-part photo. |
| HD90129340993, HD90129340994 | Sinotruk HOWO / Sitrak brake adjuster replacement direction | Confirm position, side and spline count before quotation. |
| WG9100340060, WG9100340061 | HOWO / Steyr brake system reference direction | Check left/right direction and mounting hole layout. |
| WG7113457101, WG7113457102 | Sinotruk heavy truck brake parts reference direction | Compare with the removed part and axle application. |
| WG7113457201, WG7113457202 | Related HOWO / Sitrak brake adjuster reference direction | Send clear photos if the marking is incomplete. |
A useful inquiry should include the OE number, truck model, axle position, left or right side, spline or tooth count, quantity and old-part photos. If the part number cannot be read, send the full shape, spline hole, arm end, casting marks and the installation position on the vehicle.
Automatic slack adjusters are often ordered together with other truck brake parts, filters, chassis parts, bearings and regular maintenance items. For importers and workshops, a mixed order can be more practical than buying one brake item from one supplier and related service parts from another supplier.
If you are preparing stock for Sinotruk HOWO, HOWO A7 or Sitrak fleets, keep brake adjusters, filter parts and common maintenance parts in one purchase list. The list can be checked line by line, and uncertain items can be marked for confirmation with photos.
Before requesting a quote, prepare the OE number or catalog code, truck model, axle position, left/right direction, spline or tooth count, mounting hole layout, quantity and old-part photos. For a broader shipment, also add oil filters, fuel filters, brake repair parts and other regular replacement items so the order can be reviewed as one practical mixed shipment.
Send a brake parts inquiry with the part number, truck model, photos and mixed order plan, and we can help check the suitable automatic slack adjuster direction before quotation.
Use this guide to organize a clearer quote request instead of choosing from a short product list.
Part number, truck brand, model, engine model, chassis number and old-part photos help confirm the correct replacement before quotation.
Filters, brake parts, clutch parts, chassis parts, cab parts, bearings, sensors and assemblies can be checked together for one practical order.
Share quantity, packing preference and whether the order is for fleet repair, workshop use or distributor stock.
Continue by brand, model or part system when the inquiry needs more specific matching clues.
Send part numbers, truck models, chassis numbers, old-part photos or sample photos. We can help check multiple items and combine them into a practical export order.