However, this system utilizes a series of back-ups to keep the power brakes working for a short period of time in the event of a ruptured power steering hose or broken power steering belt. In fact, that’s typically the first indicator of a hydro-boost power brake failure. It is powered by the power steering pump and will typically fail at the same time as power steering. The hydro-boost power system works nearly identically to the vacuum-based system, but instead of relying on vacuum pressure, it uses direct hydraulic pressure. What is a Hydro-Boost Power Assist Service? Inability of the brake booster to absorb or create a vacuum internally.īroken internal parts, such as the check valve and vacuum hose, inside the brake booster that fail to supply power to the hydraulic lines. There are generally three sources of a vacuum brake booster failure: The vacuum supplied by the engine operates an internal bladder, which supplies the force to the hydraulic brake lines. This system is used in a vacuum booster or power brake booster. Vacuum is circulated through the brake booster, which applies pressure to the hydraulic brake lines when the brake pedal is pressed. How Does the Vacuum Brake Booster Work?Ī vacuum-based brake booster receives its power via a vacuum system attached to the engine’s intake manifold. In order to simplify things, let’s break down how a vacuum-based brake booster works as opposed to a hydraulic-based brake booster, along with a few tests for diagnosing potential problems with both. A Hydro-Boost system bypasses the need for vacuum and uses direct hydraulic pressure to accomplish the same task. Where confusion exists is calling a Hydro-Boost Power Brake Assist System a power brake booster. Each utilizes vacuum pressure to assist in the application of hydraulic fluid and utilizing friction between the brake rotor and pads. In all truth - a power brake booster and vacuum brake booster are the same part. One of the most commonly misunderstood issues is understanding the difference between a power brake booster and a vacuum brake booster. While there are several evolutions of this vital vehicle operating system, the basic premise of applying leverage, forcing hydraulic pressure, and friction still remains the fundamental process for slowing and stopping a vehicle. If you own a vehicle made after 1968, it’s likely that you have a power brake system.
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