Brake shoe assembly 23A-32-11231

Core Features

Service Brake: Hydraulic pressure opens the brake shoes, allowing the friction pads to engage with the brake drum and generate braking force. Suitable for high-speed (≤30 km/h) driving of graders and deceleration/stopping needs during heavy-load downhill driving.

Parking Brake: Works with a parking lock mechanism to enable long-term parking braking, preventing rollover and suitable for parking on construction site slopes.

Heat Fading Resistance: Optimized friction materials and brake shoe structure ensure stable friction coefficients at high temperatures (≤350℃), preventing brake failure.

Automatic Return: A high-strength return spring ensures rapid shoe reset after braking, eliminating drag and reducing fuel consumption and wear.

Product superiority

Material and Structural Advantages

High-wear-resistant friction pads: Made of NAO asbestos-free ceramic matrix material, with a friction coefficient of 0.38–0.42, temperature resistance of -40~+350℃, wear rate ≤0.05 cm³/(MJ), and service life ≥5000 working hours.

High-strength brake shoes: Stamped from Q345B alloy steel, heat-treated, with a tensile strength ≥510 MPa, resistance to deformation, and a fit ≥98%.

Original factory precise fit: The brake shoe curvature and mounting hole positions are perfectly matched to the GD305/GD405 brake drum and brake base plate, requiring no modification during installation, and with uniform clearance.

All-condition compatibility: Resistant to water fading and dust, suitable for muddy, dusty, and temperature-varying working conditions on construction sites, with a braking response time ≤0.3 s.

Performance and Maintenance Advantages

Stable braking performance: Braking torque ≥1800 N·m, suitable for graders with a working weight of 12–16 t, braking distance (30 km/h) ≤8 m.

Low maintenance cost: Modular assembly, replacement time ≤30 minutes/wheel, 60% more efficient than replacing individual parts; friction pads can be replaced individually, reducing parts costs.

High safety redundancy: Symmetrical double-shoe design, retaining some braking force even if one shoe fails, improving driving safety.

Installation and Maintenance Recommendations

1.Installation Points

Cleaning Inspection: Clean the inner surface of the brake drum and brake shoes, checking for scratches and cracks on the drum surface and for deformation of the brake shoes; ensure the friction pads are free of oil stains and damage.

Assembly Specifications: The clearance between the locating pin and the base plate hole should be 0.05–0.10 mm; ensure the return spring is properly installed to avoid jamming; adjust the clearance between the brake shoes and the brake drum to 0.25–0.35 mm (uniformly circumferential).

Bleeding and Adjustment: After assembly, bleed the air from the braking system and test the brake pedal travel to 15–25 mm; ensure the parking brake locks reliably.

Break-in Requirements: The new assembly requires a 50 km break-in period, avoiding emergency braking to ensure sufficient contact between the friction pads and the brake drum.

2.Maintenance

Routine Inspection: Check the braking system for leaks and ensure the brake shoes return smoothly every shift. Replace brake pads immediately if their thickness is less than 5 mm.

Periodic Replacement: It is recommended to replace the entire assembly every 5000 hours or 1 year (whichever comes first); replace individual brake pads if they are worn beyond their limit.

Troubleshooting: For brake pull, drag, or insufficient braking force, first check the brake shoe clearance, return spring, and brake pads. Replace the entire assembly if necessary and inspect the brake drum and hydraulic system.

Summarize

23A-32-11231 delivers reliable driving and parking braking for GD305/GD405 graders through factory-grade compatibility, high-friction materials, and stable performance. Its heat-resistant and easy-to-maintain features reduce downtime and costs, making it a core component for ensuring operational safety.