JP300-525000-0009 — Forklift Brake Master Cylinder

The JP300-525000-0009 is an OEM-spec brake master cylinder designed for JP300 series and compatible forklift models, providing the hydraulic pressure generation required for drum brake systems on 3-7 ton internal combustion counterbalance forklifts. This master cylinder converts mechanical pedal force into precisely regulated brake fluid pressure distributed to the front wheel cylinders through a dual-circuit outlet configuration, ensuring balanced left-right braking and safety redundancy in the event of a single circuit failure. The heavy-duty cast iron body with reinforced mounting flange provides the structural rigidity needed for the higher pedal forces generated in heavy-load forklift operations, while the large-bore piston design delivers the increased fluid displacement volume required for the larger wheel cylinders used on 5-7 ton capacity trucks.

Internally, the cylinder features a matched piston-and-seal assembly with EPDM primary and secondary cup seals that are resistant to swelling and degradation from prolonged exposure to DOT 3 and DOT 4 brake fluids. The piston bore is honed to a surface finish of Ra 0.8μm or better, ensuring smooth piston travel and consistent sealing throughout millions of actuation cycles. The heavy-gauge return spring is manufactured from chrome-silicon alloy wire that resists fatigue and maintains full return force over the service life of the cylinder. The reservoir body is molded from impact-resistant transparent nylon, providing convenient visual fluid level monitoring, and the vented screw-cap lid includes an integrated diaphragm to compensate for fluid displacement during brake application. The push rod interface is protected by a flexible EPDM dust boot that seals against dirt, moisture, and brake dust ingress.

Designed as a direct replacement for forklifts using the JP300-525000-0009 part number, this master cylinder is compatible with select models from HELI, Hangcha, Lonking, Dalian, Tailift, and other manufacturers in the 3-7 ton class. The bolt pattern, outlet thread specifications, and push rod interface dimensions match the OEM unit for straightforward bolt-on replacement. Before installation, bench-bleed the master cylinder by clamping it in a vise, filling with fresh DOT 3/DOT 4 fluid, and slowly stroking the piston until bubble-free fluid streams from both outlet ports. After mounting and connecting brake lines, perform a complete system bleed. For compatible glow plugs, fuel system components, and other JP300 engine parts, visit our Forklift Brake Parts section.

Technical Specifications

• PN: JP300-525000-0009
• Capacity: 3.0 – 7.0 Ton Forklift
• Body Material: Heavy-Duty Cast Iron
• Bore: Large-Bore for High Fluid Displacement
• Fluid: DOT 3 / DOT 4 Compatible
• Outlet: Dual-Circuit Metric Thread
• Reservoir: Transparent Nylon, Vented Cap

Compatible Forklift Models

Each JP300-525000-0009 master cylinder undergoes a full QC protocol: pressure testing at 2500 PSI for internal and external leakage, vacuum integrity check, piston stroke verification, and visual inspection of all sealing surfaces. The cylinder is packaged with outlet port dust caps installed, a pre-installed mounting gasket, and a protective sleeve over the push rod. Shipped in a VCI anti-corrosion bag inside a foam-lined reinforced box. 12-month warranty against manufacturing defects. For engine parts, brake system components, or technical assistance matching this cylinder to your specific forklift model, contact our support team.