The Critical Command for Braking Safety: Retarder Contact SZZ52018
Product Description
On a long, steep descent, a heavy bus undergoes the ultimate test
of its braking system. This is where the electromagnetic retarder
becomes the driver's most trusted tool—a powerful, auxiliary
braking force that prevents service brake fade and ensures complete
control. But this entire system, a marvel of engineering, is
entirely dependent on one small, mission-critical component: the Retarder Contact.
Nanjing Dingguan Auto Parts Co., Ltd. is proud to manufacture the SZZ52018 Retarder Contact, the essential command switch for King Long and Higer buses.
Think of this contact as the bridge between driver intent and
mechanical action. When the driver activates the retarder, it is
this precise component that closes the circuit, sending the vital
electrical signal that engages the powerful braking force. A worn
or failing contact breaks this bridge. The signal is lost, the
retarder fails to activate, and a critical safety system is
rendered useless at the moment it is needed most.
Our SZZ52018 is engineered to eliminate this single point of
failure. It is manufactured from premium, high-conductivity alloys
and features contact points designed to resist the electrical
arcing and mechanical wear of constant use. This ensures a crisp,
immediate electrical signal every time, resulting in flawless,
lag-free retarder activation.
Engineered as a direct, OEM-standard replacement, it guarantees a
perfect fit and a swift installation process for your King Long and
Higer fleet. By replacing this small, cost-effective part, you are
not just performing maintenance; you are restoring the integrity of
a life-saving system. This investment protects your service brakes
from premature wear, significantly lowers maintenance costs, and
provides your drivers with the unwavering confidence they need to
navigate any terrain safely.
Trust Nanjing Dingguan for components where reliability is
non-negotiable.
Contact our expert team today for a competitive quote.
Product Name: | Retarder contact | Part Number; | SZZ52018 |
Quality control: | ECE R11+CCC | Size: | insurance |
| Type: | Retarder accessories | Place of origin: | Nanjing, China |
Materials: | Multi-material | Packaging: | Paper packaging/custom packaging |
Minimum order quantity: | 1 | Application: | Bus |
Status: | brand new | Cargo transportation: | TNT, EMS, UPS, FedEx, DHL or according to your requirements. |
OE: | SZZ52018 | Factory quality inspection: | 100% inspection |
Product details pictures

How to buy the right bus accessories
| 1.Please provide VIN number |
| 2.Please provide clear photos |
| 3.Please provide the OEM number |
| 4.lf you are unsure, please contact us. |

Nanjing Dingguan Auto Parts Co., Ltd.
-- Your reliable partner for bus spare parts.
About Us
Nanjing Dingguan Automotive Parts Co., Ltd. specializes in
providing high-quality and cost-effective parts for buses and
commercial vehicles. We focus on the global market, have rich
experience in exporting bus and truck parts, provide services to
distributors and fleet operators, and provide tailor-made solutions
to meet different needs.
Warehouse and cargo display

About shipping and packaging
transportation | TNT, EMS, UPS, FedEx, DHL or as per your requirement. |
| packaging | Bubble wrap, cartons, wooden boxes, and pallets are used to avoid
damage to goods caused by bumps. |

common problem
1: Can you provide an accurate price? |
| Sure. You need to provide the vehicle VIN number, provide the
product OEM code, or provide a clear product photo. |
2: What's your minimum order quantity? |
| No minimum order quantity, of course, if you buy more items from
our company, you can get preferential prices and discounts. |
3: What's the delivery time? |
Air freight orders take 5 to 8 days. Sea freight orders take 15 to
25 days. |
My advantage
1:High-Quality Bus Components |
| Specialized in premium aftermarket bus parts including engines,transmissions, and braking systems, built for durability and
performance. |
| 2:Comprehensive spare parts solution |
| We offer a full range of bus accessories: filters, suspension
components, electrical components, and interior accessories for all
major bus brands. |
3: ISO-Certified Manufacturing |
Our ISO 9001/TS 16949-certified products ensure strict quality
control, reliability, and compliance with international
standards.ISO |
4: Global Bus Part Coverage |
Our products are compatible with leading bus models from Europe,
Asia, and the Americas. |
5;Extensive product catalog |
Engine parts, HVAC systems, lighting, wheels and safety components
covering city, intercity and long-distance buses. |
Contact Us