If you own a 1984-1987 Buick Grand National, T-Type, or Turbo Regal, you know the reputation of the factory factory-installed Powermaster brake system. When it works, it is fine—but when the factory accumulator ball fails or the internal switches burn out, it leaves you with an unpredictable, dangerous, and incredibly expensive hard pedal.

Vacuum brake conversions are an option, but the aggressive nature of the 3.8L SFI Turbo engine means vacuum drops significantly under load or modified camshaft profiles, leading to inconsistent assist.

The ultimate solution? The Kirban Performance Wilwood Hydro-Boost Conversion Kit. This 100% brand-new, direct bolt-in hydraulic assist system completely replaces the problematic Powermaster setup. By tapping into your Buick’s power steering pump fluid pressure, it delivers a massive, rock-solid 2,400 PSI of line pressure straight to your calipers. This setup provides modern, supercar-level stopping power and zero vacuum dependence.

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  Genuine Wilwood Engineering: This premium package is anchored by a high-performance Wilwood Tandem Chamber Master Cylinder, pressure-die-cast from high-strength aluminum. It sheds front-end weight while providing structural integrity that will never flex under extreme braking pressures.


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  Massive 2,400 PSI Hydraulic Assist: While a vacuum booster struggles to hit 1,000 PSI, this hydraulic unit uses your power steering system to amplify your pedal pressure. It yields a shorter, firmer, and completely predictable pedal stroke with absolute minimum driver effort.


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  Perfect for Intercooled Cars: Designed to clear the tight engine bay constraints of the 1986-1987 remote power steering reservoir and factory turbo plumbing. The compact booster saves critical firewall space compared to massive 9-inch vacuum drums, keeping your engine bay clean, accessible, and looking aggressive.


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  100% Bolt-In, No Firewall Modification: Engineered explicitly for the G-Body firewall. Features an adjustable OEM-height brake pedal rod set to ensure your factory pedal placement feels completely natural inside the cabin.