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Triumph T140 TR7 750 Lockheed 1/2″ Performance Stainless Master Cylinder Upgrade (1) 13mm PN# 99-7027 /13 S and 99-9918


Upgrade your Triumph T140 TR7 750 motorcycle with this high-performance stainless steel master cylinder.

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Tired of the wooden feeling brakes on your Triumph T140 Bonneville or TR7 Tiger Twin, or your T150 / T160 Trident Triple? This master cylinder barrel is the answer to your prayers! We had these made for us in stainless steel to alleviate the rust & pitting issues that plagued OEM master cylinders and to visually replicate the O.E.M. item. Bored 1mm smaller (1/2″ / 13mm bore) to add stronger braking and feel. Although the above recommendations are for Triumph front brakes, they fit all Triumph front applications 1973 onward with Lockheed brakes. As per manufacturer guidance, this product must NOT be fitted on 60-4401 S rear master cylinder. Sold individually.

View or download the Lockheed Hydraulic Brake Equipment Service Instructions 

For complete master cylinder assemblies and standard 14mm bore master cylinder barrels, see recommended links.


  • Enhanced Braking Power: The upgrade ensures better braking performance, providing more control and safety.
  • Durable Construction: Stainless steel construction resists wear and tear, ensuring longevity.
  • Direct Replacement: Easy installation with no modifications needed, designed to fit perfectly in place of the original part.



LF Harris motorcycle spares are produced to the highest quality standards possible utilizing original Triumph tooling, dies, factory blueprints & materials combined with modern manufacturing equipment, tolerances & techniques.

Additional Items to Consider:


1 review for Triumph T140 TR7 750 Lockheed 1/2″ Performance Stainless Master Cylinder Upgrade (1) 13mm PN# 99-7027 /13 S and 99-9918

  1. Review by Owner

    Enhanced Braking Performance: Many users report a noticeable improvement in braking efficiency and responsiveness.
    Durable Construction: The stainless steel build is highly resistant to corrosion and wear, ensuring a long lifespan.
    Direct Replacement: The master cylinder fits perfectly in place of the original part, making installation straightforward and hassle-free.
    Improved Safety: With better braking power and control, riders feel more secure, especially in emergency braking situations.
    Quality Engineering: The precision manufacturing of this master cylinder ensures consistent performance and reliability.

    Higher Cost: The stainless steel construction and performance improvements come at a higher price point compared to standard replacement parts.
    Installation Complexity: While it is a direct replacement, some users may still find the installation process challenging without professional assistance.
    Limited Compatibility: This upgrade is specifically designed for the Triumph T140 TR7 750, limiting its use for other models or brands.
    Potential Overkill for Casual Riders: For riders who do not push their bikes to the limits, the performance benefits might not be as noticeable or necessary.
    Availability: As a specialized part, it may not be as readily available at all motorcycle parts retailers, potentially leading to longer wait times for delivery.

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