Bosch Hydro-Max®
The Bosch Hydro-Max® brake system is a hydraulic power brake solution designed for medium-duty trucks, motorhomes, buses, and fleet vehicles that require consistent brake assist without relying on engine vacuum. Unlike traditional vacuum boosters, Hydro-Max systems use hydraulic pressure and an integrated electric backup pump to maintain braking performance even in low-vacuum or engine-off conditions.
Hydro-Max is commonly used in diesel applications and heavier vehicles where vacuum supply is insufficient or unreliable. It is also widely used as a retrofit solution to replace older systems such as Hydro-Vac, Delco Moraine Hypower, and Bendix Dual Power units that are no longer supported or have become difficult to service.
Sweeting Performance specializes in Bosch Hydro-Max® boosters, master cylinders, hose kits, and conversion components engineered for reliability, serviceability, and proper system integration across a wide range of vehicle platforms.
Bosch Hydro-Max® Overview
Bosch Hydro-Max® provides hydraulic brake assist where vacuum boosters fail, combining power steering pressure with an optional electric backup pump. Ideal for diesel trucks, motorhomes, buses, and fleet vehicles.
Why Choose Hydro-Max®?
- Reliable hydraulic assist independent of vacuum
- Built-in electric backup pump for emergency situations
- Retrofit solution for Hydro-Vac, Delco Hypower, Dual Power systems
- OE-quality components and Sweeting Performance expertise
Bosch Hydro-Max® Frequently Asked Questions
What vehicles use Hydro-Max brake systems?
Hydro-Max systems are commonly found in medium-duty trucks, motorhomes, construction and agricultural equipment, buses, and commercial fleet vehicles where engine vacuum is limited or inconsistent and a CDL license is not required.
How is Hydro-Max different from Hydro-Boost?
The Hydro-Boost is used for vehicles that require a master cylinder bore size of 1 inch to 1-1/2 inch, while the Hydro-Max if for vehicles requiring a 1-3/4 to 2 inch bore master cylinder. The Hydro-Max uses an electric/hydraulic backup pump in addition to hydraulic assist, allowing braking even if the engine is off. Hydro-Boost systems rely solely on power steering pressure and do not include an electric backup.
Can Hydro-Max replace older brake booster systems?
Yes, Hydro-Max can be used as a retrofit replacement for obsolete systems such as Hydro-Vac, Delco Hypower, Bendix Dual Power, and Wabco ABS units, improving reliability and parts availability.
What are common Hydro-Max failure symptoms?
The Hydro-Max is pretty robust, typically only seeing seals replace every few hundred thousand miles after noticing some fluid leaks. After 20-30 years the booster may need to be serviced or replaced, along with accessory parts replaced.
Does Hydro-Max require a vacuum source?
No, Hydro-Max systems do not rely on engine vacuum. It operates using hydraulic pressure and an electric backup pump for consistent brake assist.
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