Vehicle & Part Overview
The 1967 MGB GT (MkI) utilizes a standard front braking system that can be maintained with OEM-spec parts or enhanced through several tiers of performance upgrades.
Standard Specifications
- Correct Part Name: Front Brake Disc (or Brake Rotor)
- OEM Part Number: BTB101 (formerly BTA393)
- Specifications: Solid (non-vented) discs, approximately 10.75 inches (273mm) in diameter.
Upgrade Options
Because the MGB GT is heavier than the roadster variant, many owners opt for upgrades to improve heat dissipation and stopping power:
- 4-Piston Caliper Kit: Replaces heavy, twin-piston cast iron Girling calipers with modern aluminum 4-piston calipers (such as Wilwood). This reduces unsprung weight and provides more even pressure across the pad.
- Vented Disc Conversion: Uses modified V8 or RV8 spec discs. This allows the rotor to cool from the inside out, reducing brake fade during spirited driving. This typically requires a caliper spacer kit or wider 4-piston calipers.
- Braided Stainless Steel Hoses: Replaces old rubber lines to prevent swelling under pressure, resulting in a firmer brake pedal.
- Performance Brake Pads: High-friction compounds such as EBC Greenstuff (fast road use) or Mintex 1144.
- Suspension Integration: Upgrading to adjustable coilovers or performance dampers helps manage front-end dive caused by increased braking force.
Sourcing Recommendations
Specialist & OEM Suppliers
- Moss Motors: The primary specialist for MGB parts, offering standard BTB101 discs and Wilwood upgrade kits.
* Search Moss Motors for "MGB Wilwood Brake Kit"
- Rimmer Bros: Carries multiple grades of parts, including OE brands like TRW or Borg & Beck.
* [Search Rimmer Bros for