Power Steering Pumps Explained

Published Date: 1st Aug 2023

Audi Driver holding his Steering WheelCar power steering pumps are hydraulic devices that revolutionise driving by reducing the effort required to turn a vehicle's wheels. Invented by Francis W. Davis in 1926, they have since become an integral part of modern automobiles.

Power steering pumps work with pressurised fluid to provide extra force, making steering considerably easier for drivers. This is particularly beneficial when manoeuvring at low speeds or when the vehicle is heavily loaded. Inside the sealed housing, the pump's rotor spins, generating hydraulic pressure that is then utilised to assist the steering mechanism. This invaluable assistance ensures smooth and effortless control for the driver.

The benefits of power steering pumps are immense. They minimise steering effort, enhancing control and manoeuvrability, which is crucial for avoiding accidents and making quick steering inputs. Moreover, they alleviate driver fatigue by reducing the physical strain of steering, ensuring a more comfortable and enjoyable driving experience.

Nowadays, power steering pumps are standard in vehicles, replacing early manual systems. Thanks to Francis W. Davis, driving has become more manageable, allowing drivers worldwide to navigate easily and confidently.


Evolution of Power Steering Pumps - Improved driving experience


Since their invention by Francis W. Davis in 1926, power steering pumps have undergone significant transformations, driven by technological advancements and the automotive industry's relentless pursuit of improving the driving experience. Over the years, engineers and designers have worked tirelessly to enhance power steering systems' performance, efficiency, and reliability, resulting in remarkable innovations that have revolutionised modern driving.

The early power steering pumps were based on hydraulic principles, providing drivers with much-needed assistance in steering, especially during slow-speed manoeuvres and heavy loads. While these systems were a significant step forward from manual steering, they did have some limitations, such as fluctuations in steering feel based on engine RPM and the potential for parasitic loss from the engine.

Image of a Man Driving his CarWith the advent of electronic technology and microprocessors in the automotive world, a new era of power steering emerged - the Electric Power Steering (EPS) system. Unlike its hydraulic predecessors, EPS utilises electric motors to assist steering, offering several advantages. One notable benefit is improved fuel efficiency since EPS only draws power when steering assistance is required, reducing engine drag and conserving energy.

Moreover, EPS allows greater flexibility in customising steering feel and responsiveness based on driving conditions or driver preferences. This adaptability enhances the driving experience, providing a more personalised and comfortable journey.

In recent years, advancements in power steering technology have extended to features like electrically assisted rack and pinion systems, variable-assist systems, and speed-sensitive systems. These cutting-edge technologies further refine the steering experience, adapting the level of assistance based on vehicle speed, driving conditions, and individual driver inputs.

Furthermore, automotive manufacturers have integrated electronic sensors and controls to enhance safety features. For example, certain power steering systems now integrate with advanced driver assistance systems (ADAS), facilitating functionalities such as lane-keeping assist and active steering correction, thereby fortifying vehicle stability and safety.

One can anticipate even more intriguing possibilities when considering the future of power steering pumps. As electric and autonomous vehicles become increasingly prevalent, power steering systems will become even more sophisticated, tailored to integrate seamlessly with other advanced technologies in the automotive landscape.

The development of power steering pumps has exemplified the automotive industry's commitment to augmenting the driving experience. From the initial hydraulic pumps to cutting-edge Electric Power Steering systems, each progression has played a role in facilitating smoother, more efficient, and safer driving. As technology advances, drivers can anticipate additional enhancements in power steering, resulting in an even more gratifying and assured ride on the roads.


Why is the Power Steering Pump so important?


Man holding a Car Steering WheelCar power steering pumps play a critical role for drivers, revolutionising the driving experience in various aspects. Initially designed by Francis W. Davis in 1926, power steering pumps effectively minimise the physical exertion needed to steer the wheel, facilitating vehicle control. This becomes particularly vital during low-speed manoeuvres or when the car is heavily laden, enabling seamless and effortless navigation.

In addition to making driving easier, power steering pumps also enhance driving safety. By enabling quick and precise steering inputs, power steering pumps help drivers to respond promptly to hazards, minimising the risk of accidents. For example, if a driver needs to swerve to avoid an obstacle, a power steering pump can help them make the necessary steering adjustments quickly and easily. This can make the difference between avoiding an accident and being involved in one.

Finally, power steering pumps also contribute to driver comfort. Solving the physical strain of steering, they help reduce driver fatigue during long journeys, enhancing overall comfort and ensuring a more enjoyable driving experience.

In short, power steering pumps are an essential safety feature that can make driving easier, more comfortable, and more enjoyable. With power steering pumps now a standard feature in modern cars, drivers can confidently navigate roads with ease and precision, thanks to the ingenuity of Francis W. Davis and the hydraulic assistance they provide.


Different Types of Power Steering Pumps


There are two main types of power steering pumps: belt-driven and electric. Each type has its own set of pros and cons.


Belt-Driven Power Steering Pump:



Cost-Effective: Belt-driven power steering pumps are generally more affordable and easier to manufacture, making them a common choice for many vehicles.

Efficient at High RPMs: They work well at high engine RPMs, providing ample hydraulic pressure to assist steering even during fast driving.

Proven Technology: Belt-driven pumps have been used for decades and have a long track record of reliability.



Parasitic Loss: Since the engine's belt drives them, they create a small amount of parasitic drag on the engine, reducing overall fuel efficiency.

Limited Control: The pump's assistance level is tied to the engine's RPM, so the steering feel may not be as adjustable or precise as electric systems.


Electric Power Steering Pump:



Fuel Efficiency: Electric power steering pumps are more energy-efficient since they only draw power when steering assistance is needed, reducing engine drag and improving fuel economy.

Adjustable Steering Feel: Electric systems offer more flexibility in adjusting the steering feel, allowing for customisation based on driving conditions or driver preferences.

Simplified Design: Electric power steering pumps have fewer moving parts, reducing maintenance needs and potentially longer lifespan.



Initial Cost: Electric power steering pumps can be more expensive to install, adding to the overall cost of the vehicle.

Reliance on Electronics: Since electric systems depend on electronic controls, malfunctions or failures in the electrical components can affect the power steering function.

Limited Performance at Low RPMs: Electric systems may provide less assistance at very low engine RPMs, affecting steering effort during parking or slow manoeuvres.


Which type of Power Steering Pump is better?


There is no definitive answer when determining which type of power steering pump is better, as both belt-driven and electric power steering pumps have advantages and limitations. The optimal choice depends on several factors, including vehicle design, budget considerations, and the driver's preferences.

Image of an Open Road and Car Steering WheelBelt-driven power steering pumps have been the traditional choice for many years due to their cost-effectiveness and long-standing reliability. These pumps are mechanically driven by the engine's belt system, drawing power directly from the engine. While this setup can create a slight parasitic drag on the engine, resulting in reduced fuel efficiency, the overall cost and simplicity of the design make them a popular option for various vehicles, especially in older models.

On the other hand, electric power steering pumps have gained popularity in modern vehicles due to their energy-efficient operation. Unlike belt-driven pumps, electric pumps only draw power when steering assistance is required, reducing the engine drag and enhancing fuel economy. Additionally, electric systems offer more flexibility in adjusting the steering feel, providing a range of customisable options based on driving conditions or driver preferences. Changing the steering feel can significantly improve the driving experience, providing a more personalised and comfortable journey.

However, it is worth noting that electric power steering pumps can be more expensive to install initially, which may influence the overall cost of the vehicle. Moreover, electric systems rely on electronic controls, making them susceptible to potential malfunctions or failures in electrical components. This dependence on electronics might pose certain reliability concerns, especially in older vehicles or challenging driving conditions.

Ultimately, the decision between belt-driven and electric power steering pumps depends on individual needs and priorities. Some drivers may prefer belt-driven pumps' simplicity and proven reliability, especially in budget-friendly or classic car restoration projects. On the other hand, those seeking improved fuel efficiency and adjustable steering feel might lean towards the benefits of electric power steering pumps.

As automotive technology continues to evolve, advancements in power steering systems are likely to bring about even more refined and efficient options. Car manufacturers continually assess the best fit for their vehicle models based on cost, performance, and customer demands. In the end, the ideal choice aligns with the vehicle's specific requirements and meets the driver's expectations for a smooth and enjoyable driving experience.


Common Problems with Power Steering Pumps


Both belt-driven and electric power steering pumps can experience certain common problems that drivers should be aware of:


Common problems with belt-driven power steering pumps:


Leaking Fluid: One of the most prevalent issues with belt-driven power steering pumps is fluid leakage. Over time, seals will wear out or become damaged, leading to fluid leaks. Low fluid levels can result in reduced steering assistance and cause difficulty in turning the wheels.

Noisy Operation: A whining or groaning noise when turning the steering wheel is a common problem associated with belt-driven power steering pumps. This noise is often caused by air in the system or a worn-out pump, indicating that the pump might need servicing or replacement.

Pump Failure: Overloading the steering system, using the steering wheel at full lock for extended periods, or operating the vehicle with low fluid levels can lead to pump failure. A failed power steering pump will result in losing power steering assistance, making steering much harder and potentially dangerous.


Common problems with electric power steering pumps:


Electrical Malfunctions: Electric power steering pumps use electronic components to function correctly. Malfunctions in sensors, controllers, or electric motors can lead to erratic steering assistance or a complete loss of power steering.

Reduced Steering Feel: Some drivers may find electric power steering pumps lacking in "road feel" compared to traditional hydraulic systems. The steering feels less natural and could be over or under-assisted, affecting the driver's perception and control of the vehicle.

Software Glitches: Electric power steering systems often have complex software that controls steering assist based on various factors. Software glitches or updates can impact the system's performance and may require reprogramming or updating at the dealership.

Overheating: Electric power steering pumps can overheat if they are worked too hard or if the vehicle is operated under extreme conditions. Overheating can lead to a temporary loss of power steering assistance until the system cools down.


Regular maintenance and servicing of the power steering system are imperative to prevent or address these issues. It is essential to check fluid levels, inspect for leaks, and promptly address any abnormal noises to uphold the efficiency and reliability of the power steering pump. If persistent problems arise, seeking professional assistance from a qualified mechanic or dealership is advisable for accurate diagnosis and resolution.


What should I do if I notice problems with my Power Steering Pump?


If you notice problems with your power steering pump, you must take prompt action to ensure your safety and prevent damage to your vehicle. Here are the steps you should follow if you encounter issues with your power steering pump:


  1. Stop Driving: If you experience a sudden loss of power steering assistance or notice any unusual noises, vibrations, or difficulties in steering, pull over to a safe location as soon as possible. Continuing to drive with a malfunctioning power steering system can be hazardous and might lead to accidents.
  2. Check Fluid Levels: One of the typical problems encountered with power steering pumps is low fluid levels. Open the bonnet and inspect the power steering fluid reservoir. If the level is low, consider temporarily supplementing the fluid to determine if it resolves the issue. Nevertheless, remember that low fluid levels could indicate a leak, making it imperative to address the underlying matter promptly.
  3. Look for Leaks: Inspect the area around the power steering pump and hoses for any signs of fluid leakage. If you notice leaks, waiting to drive the vehicle until the problem is repaired is best to prevent further damage to the pump or steering system.
  4. Seek Professional Help: Power steering systems can be complex, and diagnosing and repairing issues requires specialised knowledge and tools. If you need more clarification about the problem or topping up the fluid doesn't resolve the issue, it's best to seek professional help from a qualified mechanic or take your vehicle to a reputable service centre.
  5. Avoid Overworking: While waiting for professional assistance, avoid putting unnecessary strain on the power steering system. Avoid making tight turns or driving at low speeds for extended periods, as these actions can exacerbate the problem.
  6. Follow Maintenance Schedule: Regularly maintaining your vehicle, including scheduled power steering system checks, can help prevent major issues. Adhering to the manufacturer's recommended maintenance schedule can extend the life of your power steering pump and ensure its optimal performance.


Remember that power steering problems should not be ignored, as they can impact your ability to control the vehicle and may lead to accidents. Taking timely action and seeking professional help will ensure your power steering pump is repaired or replaced correctly, restoring safe and smooth driving conditions.


Selecting the appropriate power steering pump for your vehicle involves considering several factors:


  1. Your Car's Make and Model: Different power steering pumps are designed to fit specific car makes and models. Refer to your car's owner's manual to find your vehicle's recommended power steering pump.
  2. Your Driving Habits: If you drive in challenging conditions, such as dusty or sandy areas, opt for a power steering pump that offers enhanced durability and resilience to handle such environments effectively.
  3. Your Budget: Power steering pumps come in a range of prices, so it's crucial to establish your budget before making a purchase. Consider how much you will spend on a power steering pump that meets your requirements.
  4. Your Performance Goals: If you seek optimal performance from your vehicle's steering system, investing in a higher-quality and potentially more expensive power steering pump may be the right choice.


Once you've considered these variables, you can begin exploring the available options for power steering pumps. There are various brands and types to choose from, catering to diverse needs and budgets. Research and compare the features of different power steering pumps to ensure you find one that aligns with your vehicle's specifications and enhances your overall driving experience.


Here are some additional tips for choosing Power Steering Pumps:


  1. Opt for Reputable Brands: Choose from reputable and well-established brands when selecting a new power steering pump. Usually, this guarantees a high-quality and reliable product that meets your vehicle's specific needs.
  2. Read Customer Reviews: Before making a purchase, take the time to read reviews from other car owners who have used the power steering pump you are considering. Customer feedback provides valuable insights into the pump's performance and compatibility with your car model.
  3. Seek Expert Advice: If you need clarification on which power steering pump is best for your car, consult your trusted mechanic. Their expertise will help you decide based on your vehicle's requirements and driving habits.


By following these valuable tips, you can confidently select your car's right power steering pump, ensuring smooth and efficient steering performance on every drive.


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