YAMAHA 2H7-W0042-00-00 Rear Master Cylinder

( Manufacturer Part Number: 2H7-W0042-00-00 ), ( Unit Type: Unit ), ( Manufacturer Warranty: 1 Month ), ( Universal Fitment: No ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear ), ( Country Of Origin: Japan )

Review YAMAHA Rear Master Cylinder fits XS1100E 1979–1982

The **Yamaha 2H7-W0042-00-00 Rear Master Cylinder (RMC) for the 1979 1982 XS1100E** is a meticulously engineered hydraulic component designed to deliver precise and reliable braking performance on one of Yamaha s most iconic classic sport-touring motorcycles. This aftermarket replacement part is a direct-fit, high-quality alternative to the original equipment, ensuring seamless integration with the XS1100E s braking system while maintaining the same robust build and functionality. Crafted from durable materials, including a sturdy metal housing and a corrosion-resistant internal assembly, this master cylinder is engineered to withstand the demands of daily riding, long-distance touring, and spirited cruising alike. The design features a smooth-bore piston and a sealed, low-friction mechanism that minimizes brake pedal effort while maximizing responsiveness, allowing riders to enjoy consistent stopping power regardless of weather conditions or load. Whether restoring an original XS1100E or upgrading an existing bike, this master cylinder is built to restore confidence in the braking system, reducing pedal travel and ensuring a firm, progressive feel under foot. Its compatibility with the XS1100E s hydraulic disc brake setup paired with the front caliper and rear brake components makes it an essential component for maintaining optimal safety and performance. Ideal for both restoration projects and routine maintenance, this Yamaha rear master cylinder is a testament to the brand s commitment to durability and precision engineering, ensuring that enthusiasts can ride with the assurance of a reliable braking system for years to come.

### **Pros and Cons of buying a Yamaha 2H7-W0042-00-00 (1979 1982 XS1100E Rear Master Cylinder)**

1. **Direct Replacement Part** This is an exact OEM (Original Equipment Manufacturer) part for the Yamaha XS1100E, ensuring a perfect fit without modifications. It will function identically to the original component, maintaining the bike s intended performance and braking efficiency.

2. **Reliability and Durability** Yamaha parts are known for their quality and longevity, especially in critical components like the rear master cylinder. A well-maintained OEM part should last as long as the original, provided it is installed and serviced properly.

3. **Ease of Installation** Since it is a direct replacement, installing this part requires minimal adjustments. Most mechanics or experienced riders can swap it out in under an hour with basic tools, reducing downtime and labor costs.

4. **Compatibility with Aftermarket Upgrades** If you plan to upgrade other braking components (e.g., calipers, brake lines, or pads), this master cylinder will integrate seamlessly with aftermarket parts designed for the XS1100E.

5. **Prevents Brake Failure** The rear master cylinder is a critical safety component. A failing or leaking cylinder can lead to brake failure, which is especially dangerous on a motorcycle. Replacing it proactively avoids potential accidents.

6. **Cost-Effective Long-Term Solution** While the upfront cost may be higher than some aftermarket alternatives, an OEM part eliminates the risk of compatibility issues or premature failure, saving money on repeated replacements or repairs.

7. **Resale Value Preservation** Keeping the bike stock or with genuine parts can help maintain its resale value, especially for collectors or enthusiasts who prioritize authenticity.

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1. **Higher Upfront Cost** OEM parts are typically more expensive than aftermarket alternatives. For the Yamaha XS1100E, a genuine rear master cylinder may cost significantly more than a third-party equivalent, which could be a deterrent for budget-conscious buyers.

2. **Limited Availability** While Yamaha parts are widely available for classic models, sourcing a specific OEM cylinder (especially for older bikes like the XS1100E) may require ordering from specialty suppliers, eBay, or motorcycle restoration shops. This can add time and potential hassle to the purchase process.

3. **Potential for Counterfeit Parts** Buying from unverified sellers (e.g., untrusted online marketplaces) risks receiving a counterfeit or low-quality part that may fail prematurely. Always purchase from reputable dealers or suppliers with return policies.

4. **No Performance Upgrades** Unlike aftermarket parts, this is not an upgraded component. It will not improve braking performance beyond the original specifications, which may be a drawback if you re looking to enhance the bike s handling.

5. **Maintenance Requirements** Even an OEM part requires regular maintenance, such as bleeding the brake system to remove air, checking for leaks, and replacing brake fluid at recommended intervals. Neglecting these steps can lead to failure.

6. **Age-Related Wear** If the original master cylinder was already worn or damaged, the new part may not solve underlying issues (e.g., corroded brake lines, seized calipers, or contaminated brake fluid). A full brake system inspection is advisable before replacement.

7. **Environmental and Ethical Concerns** Some buyers may prefer aftermarket parts for environmental reasons (e.g., recycling old OEM components) or ethical concerns about sourcing new parts from manufacturers.

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### **Conclusion**

The Yamaha 2H7-W0042-00-00 rear master cylinder is an excellent choice if you prioritize **reliability, authenticity, and long-term safety** for your 1979 1982 XS1100E. It ensures a seamless fit, maintains the bike s original performance, and reduces the risk of brake failure a critical factor for safety. However, the **higher cost, potential availability issues, and lack of performance upgrades** may make it less appealing to buyers on a tight budget or those seeking aftermarket enhancements.

If your primary goal is **restoration, safety, or preserving the bike s originality**, the OEM part is the best option. If you re open to cost savings or performance tweaks, an **aftermarket master cylinder from a reputable brand** (e.g., Akebono, Brembo, or a high-quality Yamaha-compatible alternative) could be a viable alternative provided it meets your compatibility and quality standards.

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### **Recommendation**

- You value **authenticity and long-term reliability** for your XS1100E.

- You re restoring the bike to stock condition or maintaining its original specifications.

- You re willing to pay a premium for a **direct replacement** with minimal risk of compatibility issues.

- You plan to keep the bike for the long term and want to avoid potential brake-related failures.

- You re on a **tight budget** and can find a high-quality, compatible replacement (e.g., from brands like Akebono or Brembo).

- You want to **upgrade braking performance** (though this requires checking compatibility with other brake components).

- You re unable to source the OEM part easily and are comfortable verifying the aftermarket part s quality.

1. **Inspect the existing brake system** Ensure the issue is isolated to the master cylinder (check brake lines, calipers, and fluid for leaks or corrosion).

2. **Bleed the brakes** If replacing due to spongy brakes, bleeding the system afterward is essential.

3. **Buy from a trusted source** Purchase from Yamaha dealers, specialty motorcycle parts suppliers, or well-reviewed online retailers to avoid counterfeits.

4. **Budget for installation** If you re not comfortable installing it yourself, factor in labor costs.

Ultimately, the OEM part is the **safest and most reliable choice** for the XS1100E, but weigh the pros and cons against your priorities and budget.

Details:

Came off a 1979 Yamaha Xs1100E parts bike.

part #: 2h7w00420000 prices

• $33.25-$52.99

specifications cyclevintagee:

• for models: Xs1100e
• for makes: Yamaha
• for years: 1979-1982
• mpn: 2h7-w0042-00-00
• unit type: Unit
• manufacturer warranty: 1 Month
• universal fitment: No
• vintage part: Yes
• placement on vehicle: Rear
• country of origin: Japan

returns cyclevintagee:

• policy: No Returns

seller cyclevintagee:

• rating: 100.0%
• # reviews: 52
• city: Tulare, California

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

shipping cyclevintagee:

• cost: $8.65
• type: Calculated
• service: USPS Ground Advantage
• carrier: USPS
• transit: 5-11 Days
• class: Standard

payments cyclevintagee:

• wallet: Apple-pay
• credit card: Diners-club
• other

offer cyclevintagee:

• started: March 22, 2026
• availability: In Stock
• sold: 0
• best offers: True
• options: Ship-to-home
• quantity: 1

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