Shandong Shengyue Technology Development Co.,Ltd is one of the most professional 165 hp motor grader brake master cylinder for xcmg gr165 changlin py165 shantui sg16-3 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
165 HP Motor Grader Brake Master Cylinder for XCMG GR165 Changlin PY165 Shantui SG16-3
Identify the brake system type
Class 165 motor graders typically utilize an air-over-hydraulic (or full hydraulic/air-actuated) system. The master cylinder may be either a full hydraulic brake valve (foot-operated valve) or an air-actuated master cylinder (booster).
Master cylinder: Located beneath the cab foot pedals; responsible for distributing braking pressure.
Slave cylinder/Booster: Typically located near the frame or rear axle housing; responsible for actuating the brakes.
Troubleshooting Common Issues
1. Spongy or weak brakes: Air in the lines requires bleeding; alternatively, internal leakage caused by worn rubber seals in the master cylinder can be addressed by purchasing a master cylinder repair kit (oil seals) for a more cost-effective fix.
2. Pedal sticks and fails to return: The internal return spring is broken or the valve stem is jammed; the master cylinder assembly must be replaced in this case.
3. Insufficient brake fluid or air pressure: Check the brake fluid reservoir level or the air compressor pressure gauge to ensure the power source is functioning correctly.
Core Technical Parameters
| Parameter Item | Air Brake Master Valve (Dual-Circuit Foot Pedal Valve) | Hydraulic/Oil Booster Pump (Slave Cylinder) |
|---|---|---|
| Rated Working Pressure | 0.8 MPa - 1.0 MPa (Air Pressure) | 12 MPa - 16 MPa (High Hydraulic Pressure) |
| Inlet / Outlet Size | M16 × 1.5 or M22 × 1.5 Thread | M14 × 1.5 or High-Pressure Flange |
| Primary Material | High-strength cast iron body + Die-cast aluminum cover | Cast steel body + Hard chrome alloy piston rod |
| Seal Temperature Resistance | -40°C to +120°C (Wear-resistant Viton/FKM) | -30°C to +100°C (High shear-resistant Polyurethane) |
| Applicable Medium | Filtered and dried compressed air | No. 46 anti-wear hydraulic oil or Mineral brake fluid |
Motor Grader Service Brake System Maintenance BOM Detail
| No. | Component Name (EN) | Qty | Unit | Replacement Suggestion |
|---|---|---|---|---|
| 1.0 | Master Valve & Power Source | |||
| 1.1 | Air Brake Foot Valve Assembly (Master Valve) | 1 | Pcs | Core Replacement: Replace as a whole assembly if air leaks or fails to return. |
| 1.2 | Rubber Dust Boot | 1 | Pcs | Included with master valve. Replace if torn to prevent sand/dust from jamming the valve stem. |
| 1.3 | Brake Light Pressure Switch | 1 | Pcs | Optional. Replace if contacts burn out or alarm fails. |
| 2.0 | Booster & Slave Cylinders | |||
| 2.1 | Air-over-Oil Brake Booster (Slave Cylinder) | 2 | Pcs | Replace based on oil leakage. Typically 1 unit each for front/rear axle, or 2 for rear axle. |
| 2.2 | Booster Seal Kit (Cups & O-Rings) | 2 | Sets | If the valve body is not worn, replace this seal kit only to save cost. |
| 2.3 | Brake Fluid Reservoir Assembly | 1 | Pcs | Replace based on condition (e.g., if cracked or severely contaminated). |
| 3.0 | Lines, Fittings & Seals | |||
| 3.1 | High-Pressure Copper Sealing Washer | 4-8 | Pcs | Mandatory Replacement: Deforms after disassembly; reuse will cause air/oil leaks. |
| 3.2 | Push-to-Connect Air Line Fittings | 2-4 | Pcs | Spare parts. Old fittings easily strip threads or jam during disassembly. |
| 3.3 | Steel Braided High-Pressure Brake Hose | 2 | Pcs | Replace based on condition. Mandatory if rubber shows signs of aging, cracking, or blistering. |
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