47207-37170 Brake Master Cylinder For TOYOTA DYNA WU600 XZU710 4720737170

Product Function Description

The brake master cylinder is a critical component of your Toyota Dyna or Toyoace‘s braking system. This hydraulic device converts the mechanical force of the brake pedal into hydraulic pressure, distributing brake fluid through the brake lines to activate the brakes at each wheel. For Toyota Dyna/Toyoace (XZU700/710/720/730 series, 2011-), a properly functioning brake master cylinder is essential for consistent braking performance, reliable stopping power, and safe vehicle operation. This component is designed to factory specifications, ensuring proper fit and reliable brake system performance. 

DIY Diagnosis Guide

How to Tell If Your Brake Master Cylinder Needs Replacement:

Look for these common signs:

• Spongy or sinking brake pedal – Pedal feels soft or slowly sinks to the floor under steady pressure

• Brake fluid leaks – Visible fluid near the master cylinder or under the vehicle

• Brake warning light – Warning light illuminated on the dashboard

• Reduced braking performance – Longer stopping distances or less effective braking

• Contaminated brake fluid – Fluid appears dark, cloudy, or contains particles

💡 Quick check: With the engine off, press the brake pedal firmly. If the pedal slowly sinks, the master cylinder internal seals may be failing. Check the fluid level in the reservoir and look for leaks around the master cylinder and brake booster.

Product Attributes

Fitment Guidance

Package Contents

1 x Brake Master Cylinder Assembly (Less Reservoir Tank). Note: Reservoir tank, mounting hardware, and brake fluid are NOT included unless stated. Please confirm compatibility with your vehicle model and year before purchasing. 

DIY or Professional Installation?

This replacement is suitable for DIY if:

• You have intermediate mechanical skills and the required tools (flare nut wrenches, torque wrench, brake bleeder kit).

• You are comfortable working with brake system components and hydraulic lines.

• The job takes approximately 1-2 hours.

We recommend professional installation if:

• You are not comfortable with brake system repairs.

• You do not have the proper tools for brake bleeding and line disconnection.

• You are not confident in your mechanical skills.

Note: Improper installation can lead to brake failure, safety issues, and warranty concerns. After installation, the entire brake system must be properly bled to remove air. Bench-bleeding the master cylinder before installation is required to ensure proper operation.

Step-by-Step Installation Guide

This installation guide is designed to help you replace your brake master cylinder with confidence. Before starting, ensure the vehicle is parked on level ground with the engine off. You will need the following tools: flare nut wrenches, socket set, torque wrench, brake bleeder kit, and new brake fluid.

Step 1: Drain the brake fluid from the reservoir. Place a suitable container underneath to catch any fluid spillage.

Step 2: Use a flare nut wrench to disconnect the brake lines from the old master cylinder. Be careful not to damage the line fittings.

Step 3: Remove the mounting nuts securing the master cylinder to the brake booster. Carefully remove the old cylinder.

Step 4: Transfer the reservoir and cap to the new cylinder if required (this part number is less reservoir tank). Install the new master cylinder and tighten the mounting nuts to factory torque specifications.

Step 5: Reconnect all brake lines and tighten to specification. Fill the reservoir with fresh DOT-3 or DOT-4 brake fluid.

Step 6: Bench-bleed the master cylinder before installation to remove internal air. Bleed the entire brake system starting from the wheel farthest from the master cylinder. Test brake pedal feel – it should feel firm and consistent.

Pro Tip: Always bench-bleed the new master cylinder before installation to remove internal air – this step cannot be skipped. Use a flare nut wrench to avoid rounding the brake line fittings. After installation, test the brakes at low speed to ensure proper operation and no pulling.

Common Misconceptions About Brake Master Cylinders

Myth 1: “If the brake pedal feels spongy, bleeding the brakes will fix it.”
Fact: While bleeding is necessary to remove air, a spongy pedal that persists after bleeding often indicates internal master cylinder seal failure.

Myth 2: “The master cylinder doesn‘t need replacing unless it’s leaking externally.”
Fact: Master cylinders can fail internally without any external leakage, allowing fluid to bypass the seals and reducing braking pressure.

Myth 3: “All master cylinders with the same piston diameter are interchangeable.”
Fact: Master cylinders must match the vehicle‘s brake system specifications including port configuration, mounting points, and reservoir design. 

For Individual Vehicle Owners:

“How do I know if this cylinder fits my vehicle?” – This cylinder fits Toyota Dyna/Toyoace (XZU700/710/720/730, 2011-2017) and Hino Dutro models . Please confirm your vehicle‘s year and model before ordering. The OE number 47207-37170 is the most reliable identifier.

“What if I install it and the pedal feels spongy?” – A spongy pedal usually indicates air in the system. Proper bench-bleeding and system bleeding are essential. If the issue persists, check for leaks or inspect the brake booster.

“What if the part arrives damaged or doesn‘t meet quality expectations?” – Every shipment is inspected before dispatch. If a part ever arrives defective, we’ll arrange a replacement immediately.

Storage & Shelf Life

• Store in a cool, dry place away from direct sunlight.

• Keep the component in its original packaging until installation to prevent contamination.

• Brake fluid is hygroscopic – keep the reservoir sealed and do not use fluid from an opened container that has been stored for extended periods.

• Once installed, the component has a normal service life as per the vehicle‘s maintenance schedule.

After-Sales Service & Warranty

This product is covered by our quality assurance. If you have any questions or issues regarding fitment or quality, please contact us and we will respond within 24 hours.

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