1)Surface treatment: Electrophoresis coating, spray coating
2)Heat treatment: Induction quenching
3)Material: high quality carbon steel
4)Characteristics: Strong corrosive, resistance and excellect braking performance
5)Approved by SAE and FMVSS-121 test
This set includes a pair of brake shoes 4709ES2 lined with brake lining 4709D, which fits many models of heavy duty trucks, and semi-trailers.
• Process:
Steel plate-punching-milling-welding-drilling-induction quenching-electrophoresis coating-inspection-restriking-packing.
• Weld detail:
Carbon dioxide gas arc welding is to guarantee strength, no cracked or weakened welds, no distortion of the shoe webs.
• Cam and anchor detail:
Induction hardended cam and anchor is for long term durability and life. Hardness up to HRC30-40. No wear to the pin recess prevents lateral movement.
• Shoe platform detail:
No corrosion or distortion to the shoe platorm provides optimum lining security and geometric operation helping reduce brake noise.
• Rivet hole detail:
No damage, elongation or ovality of the rivet hole reduces the risk of loosing rivets.
Brake Shoe FMSI® Number |
4709S |
Brake Configuration |
'S' cam |
Air Chamber |
Type 30 Long Stroke |
Slack Adjuster Length |
5-1/2 inches |
Adjustment |
Automatic |
Brake Size |
16-1/2 x 7 inches |
Drum Effective Radius |
8-1/4 inches |
Axle Load (GAWR) |
23000 lb |
Static Loaded Radius/Rolling Radius |
19-3/5 inches |
Test Inertia |
952 slug·ftÇ |
Hardness |
HRC30-40 |
Control Thermocouple |
Hottest lining, recessed 0.040" below surface |