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简体中文A fleet technician pulls a 4710Q brake shoe out of a Meritor Q+ drum and the first thing to verify is not the lining thickness: it is the FMSI stamp. The 4710Q designation tells you the drum diameter, the axle configuration, and the S-cam brake family it belongs to. Misidentifying this part number is one of the most common causes of shoe-to-drum misalignment, uneven lining contact, and premature replacement on heavy commercial vehicles.
A 4710Q brake shoe is a stamped steel backing component with an FMSI-standard part number, designed for Meritor Q+ (Q-Plus) air-operated S-cam drum brakes on heavy commercial vehicles.
What Is the 4710Q Brake Shoe?
The 4710Q is an FMSI-standard steel brake shoe used in Meritor Q+ air drum brake systems on heavy commercial vehicles. It carries the friction lining, and when the S-cam applies force, it presses that lining against the rotating drum to slow the axle.
The Q+ family, introduced by Rockwell and later Meritor, standardized heavy-duty air brake maintenance across North America and Europe. Its FMSI numbers, 4707Q, 4709ES2, 4710Q, and 4711Q, are now standard references for fleet managers and aftermarket distributors. The letter Q in 4710Q refers to the Q-Plus standard, which defines the 16.5-inch drum size, the anchor pin mounting, and the roller-type S-cam interface.
The 4710Q is a steel brake shoe. Its web is stamped from high-carbon steel, then heat treated to hold its shape under heavy braking loads. A rib platform runs along the table to support the lining, and the end tabs interface with the anchor pin and S-cam roller. This standardization is why the 4710Q appears on countless fleet brake parts lists and why a correctly matching steel shoe can be trusted to perform identically across a mixed fleet.
4710Q Brake Shoe Key Specifications
4710Q Steel Brake Shoe for Heavy-Duty Air Brake SystemsThis 15"x8.625" shoe with 32 rivet holes follows FMSI and Meritor Q+ standards, ensuring uniform performance across mixed fleets. Its heat-treated high-carbon steel web provides durable braking under heavy loads.View Product →
The table below lists the standard specifications that define a 4710Q brake shoe. These values follow FMSI references and the Meritor Q+ system used on Class 7 and Class 8 vehicles.
| FMSI Part Number | 4710Q |
| Brake System Type | Air-operated S-cam drum |
| Drum Diameter | 16.5 in (419 mm) |
| Shoe Width | 6.75 in (171 mm) |
| Lining Thickness | 0.75 in (19 mm) |
| End Tab Type | Q+ (Q-Series) |
| Web Material | High-carbon steel, SAE 1040/1050 |
| Web Thickness | 0.25 in (6.35 mm) |
| Mounting Type | Anchor pin with roller |
| Weight | 12.5 kg approximately |
Materials and Manufacturing Standards
A quality 4710Q depends on three factors: the steel spec, the heat treatment, and the dimensional consistency of the web and rib. The most consequential difference between a quality shoe and a non-compliant copy is not visible until the shoe is under load.
High-carbon steel grades such as SAE 1040 and 1050 give the web the strength to resist flaring under S-cam pressure. A web thickness of 0.25 inch (6.35 mm) is standard for this size. Heat treatment to roughly 28-32 HRC gives the shoe the spring-back it needs when the brake releases, preventing the lining from staying in contact with the drum after the air pressure is removed. The friction lining itself is typically an asbestos-free organic or metallic composite. For bonded shoes, the lining adhesive must survive sustained 300-degree temperatures at the drum surface. For riveted shoes, the rivet spacing and countersink depth determine how long the lining stays locked to the table.
Dimensional tolerance is the single largest driver of lining wear consistency. A table surface that varies more than 0.5 mm can reduce effective lining-to-drum contact by 20 percent, shortening service life by thousands of kilometers across the whole axle.
Manufacturers operating under the IATF 16949 quality system apply batch-level inspection to raw steel, web dimensions, and assembly tolerances. This level of control is what makes a 4710Q shoe perform consistently from one box to the next.
Vehicle Compatibility and Fitment
4709ES2 Brake Shoe for Class 7 and 8 Air BrakesManufactured under IATF 16949 quality control, this 16.5"x7" shoe with 32 rivet holes matches Eaton OE 819707. Batch inspection ensures consistent web dimensions and assembly tolerances for reliable operation.View Product →
The 4710Q fits Meritor Q+ and Rockwell Q-Plus 16.5-inch air brake systems across a wide range of Class 7 and Class 8 commercial vehicles. Compatibility is driven by FMSI numbering and the aftermarket cross-reference system. A 4710Q can match OE part numbers from major axle manufacturers, but always verify the original shoe width. Q+ shoes with the same FMSI number can have subtle width differences between OEM and aftermarket versions.
Before ordering replacement shoes, measure the existing shoe width with calipers. A 4710Q shoe used on a 16.5 x 6.75 drum will not fit a 16.5 x 7 drum, even though the FMSI number looks the same. Cross-reference guides and the OE number stamped on the original shoe should always confirm the width.
- Lower unit weight
- Consistent dimensional QC
- Faster lead times for OE and aftermarket orders
- Lower cost in high-volume fleets
- Higher mass for extreme load cycling
- Better resistance to severe abuse
- Higher cost per part
- Heavier and slower to cycle for frequent stops
Typical applications include heavy-duty tractors, bus chassis, semi-trailer bogies, and vocational vehicles such as dump trucks, flatbeds, and concrete mixers. For a detailed per-axle match, see our 4710Q fitment and installation guide.
Installation and Maintenance
4702Q Lined Brake Shoe for Vocational VehiclesThis 15"x4" lined shoe with 16 rivet holes suits heavy-duty tractors, buses, and vocational trucks. Its standardized design is compatible with Q+ systems and supported by our detailed fitment and installation guide.View Product →
Correct installation is not just about torquing the anchor pin. It is about checking the S-cam, rollers, and return springs before the drum goes back on. Below is the recommended sequence.
- Lift and support the axle, remove the wheel and drum assembly.
- Release the slack adjuster to free the S-cam.
- Inspect the anchor pin, rollers, and return springs for wear.
- Clean and grease the brake spider and anchor pin.
- Position the new 4710Q shoe, connect the roller, and install return springs.
- Reinstall the drum, pressurize the system, and set the slack.
- Test at low speed and check the lining contact pattern.
Replacement Signs
- Lining thickness at or below 6.35 mm (0.25 in)
- Visible cracks or flaking on the lining surface
- Web deformation or table warping
- Uneven wear across the shoe width
- S-cam roller marks on the end tab
Quality and Supply Considerations
Fleet purchases of 4710Q brake shoes should be evaluated on dimensional consistency, material certification, and production capacity. Batch-to-batch consistency matters most when replacing shoes across multiple vehicles in the same fleet. A supplier that cannot repeat the same web thickness, table flatness, and lining bond quality will produce different wear rates from truck to truck.
Zhejiang Bangchi Auto Parts Co., Ltd. is a China-based manufacturer of heavy-duty brake shoes with an IATF 16949-certified manufacturing base and a production line with an annual capacity of 2 million brake shoes. The company supplies both OEM and aftermarket channels, including steel brake shoes, casted brake shoes, and lined shoes with or without repair kits.
FAQ: 4710Q Brake Shoe
What vehicles use the 4710Q brake shoe?
The 4710Q fits Meritor Q+ and Rockwell Q-Plus 16.5-inch air brake systems on Class 7 and Class 8 heavy commercial vehicles, including tractors, bus chassis, and trailer bogies.
What is the shoe width of a 4710Q?
The standard 4710Q shoe width is 6.75 inches (171 mm). Some aftermarket variants are available in 7.00 inches (178 mm), so verify the original part number before ordering.
How long does a 4710Q brake shoe last?
Estimated service life under normal conditions is 40,000-60,000 km for city stop-and-go operation, 80,000-120,000 km for regional work, and 150,000-200,000 km for long-haul highway use.
What is the minimum lining thickness before replacement?
Replace the 4710Q when lining thickness reaches 6.35 mm (0.25 in). Also check for web cracks, table deformation, and uneven wear patterns.
