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We can supply reconditioned boosters or overhaul your existing booster. Please contact us for further information.

hydrovac boosters



The brake system is arguably the most important system on a vehicle. A failure in this system can have a cataclysmic consequence which could lead to loss of life. The scary part is most people have little regard for the brake system and it is often overlooked and taken for granted. Let's take a look at the some of the parts that make up the system.

Vacuum brake booster
The advent of disc brakes has brought about the widespread use of the brake booster. Disc brakes require more braking force than drum brakes since the braking surface area of disc brkes is less than that of drum brakes. As it's name implies, the booster boosts the pressure you provide with your foot to the brakes thus making it easier to push the pedal and apply brakes. A sign of booster failure is when the pedal becomes hard and requires greater braking effort and it also becomes increasingly difficult to stop the vehicle. This needs to be attended to immediately since this can result in an uncontrollable situation.

brake booster     Booster diaphragms Brake booster

Boosters, diaphragms and seals


Boosters are found in various guises from a vacuum in-line to remote hydrovacs and even hydroboosters which work on hydraulics. Vacuum boosters work off a vacuum feed from the inlet manifold in a petrol/gasoline powered vehicle to a pump either driven by the alternator, a v-belt or an electric pump. The latter are commonly found on diesel powered vehicles or vehicles with a high lift cam. Simply put, a booster works on the principle of atmospheric pressure over vacuum.

brake booster parts

Hydrovac booster parts and seals

Another type of booster is the hydrobooster which, as the name implies, is a purely hydraulic unit. It usually operates from pressure supplied by a secondary pump mounted behind the power steering pump but provides the same sort of assistance as it's vacuum cousin.



Non-return valve
This seemingly insignificant little valve is of great importance and is found in the vacuum line between the booster and the pump/inlet manifold. It is responsible for keeping air out of the booster and prevent the fuel/air mixture in the manifold from entering the booster, condensing and allowing the petrol/oil to contaminate and destroy the rubber parts in the booster.

booster valve

Non-return valve


Master cylinder
As the name implies, the master cylinder is the the part that masters all the other valves and parts in the circuit. The master cylinder pressurizes the brake system and allowes the other parts to work.

Master cylinder parts

Master cylinder parts


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hydrovac booster

Hydrovac booster diagram