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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
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