1-48100576-0K OEM Fit Brake Valve 4-Port Output for ISUZU CVR FTR FVR 10PE1 4-Port Brake Master Cylinder

The Brake Valve (4-Port Brake Master Cylinder Assembly) with OEM numbers 1-48100576-0K and 1481005760K is a verified direct-fit replacement for ISUZU CVR / FTR / FVR series trucks equipped with 10PE1 diesel engines. This brake valve is the core control component of the truck's hydraulic brake system, responsible for converting mechanical pedal force into hydraulic pressure and distributing it precisely to the front and rear brake circuits through four output ports.

The brake valve (4-port brake master cylinder) is the pressure-generating device of the hydraulic brake system. When the driver depresses the brake pedal, the push rod moves the master cylinder piston, pressurizing brake fluid and delivering it through four outlet ports to the front and rear brake lines. The built-in dual-circuit design ensures that even if one circuit fails, the other circuit still provides braking capability for safety.

The brake valve is manufactured from a high-strength cast iron or aluminum housing with precision-machined pistons and seals, ensuring excellent durability and stable hydraulic output under the high-frequency braking conditions of heavy commercial vehicles. The 10PE1 is a 15.7L inline-six diesel engine widely used in ISUZU CVR series heavy trucks.

Replace the brake valve when any of these symptoms appear:

• Spongy or sinking brake pedal — worn internal seals cause fluid bypass, increasing pedal travel abnormally.
• Brake fluid leakage — visible fluid traces at the valve housing or line connections.
• Uneven braking or pulling to one side — uneven pressure distribution across the four output ports causes inconsistent braking force.
• Brake pedal does not return or returns slowly — internal piston binding or return spring failure.
• Brake warning light stays on — insufficient hydraulic pressure triggers the brake system warning light.

1. Preparation: Drain the brake fluid reservoir. Clean the brake valve and surrounding line connections.
2. Removal: Disconnect the four line connections from the brake valve. Disconnect the push rod from the brake booster or pedal. Remove the mounting bolts and withdraw the old master cylinder.
3. Inspection: Verify the brake booster push rod length matches your original component. Inspect line connections for corrosion or damage. Clean all mating surfaces.
4. Installation: Install the new brake valve. Connect the push rod. Torque the mounting bolts to specification. Connect the four line connections.
5. Filling and Bleeding: Fill the reservoir with fresh DOT 3 or DOT 4 brake fluid. Bleed the brake system thoroughly, starting from the wheel farthest from the master cylinder.
6. Pedal Test: Pump the brake pedal several times to verify a firm pedal. Check for leaks at all connections.
7. Road Test: Perform a road test at low speed to verify proper braking performance.

• Every 10,000 km: Check brake fluid level and condition. Inspect brake valve for leakage.
• Every 40,000–50,000 km: Inspect brake system operation. Check line connections for corrosion.
• Every 2 years: Replace brake fluid regardless of mileage.
• When spongy pedal or reduced braking is detected: Inspect brake valve and brake system immediately.

• Standard Packaging: Anti-rust oil + VCI film + neutral carton.
• Custom Packaging: Neutral box, color box, or customer-branded packaging.
• Suitable For: Brake system repair shops, ISUZU parts distributors, fleet maintenance centers.
• Supply Capacity: Stable batch supply with batch-level quality reports available.
• MOQ: 10 PCS