Diagnosing power steering fluid leakage

Diagnosing power steering fluid leakage is performed when the oil level is lower than the prescribed minimum value during the check. When we have a lower fluid level in the reservoir, in addition to topping up, it is necessary to determine the cause of the loss of power steering fluid. The most common drop in fluid level is due to a leak.

When the power steering fluid level is lower than the minimum value, there is a risk of air entering the hydraulic part of the steering system. Air has a bad effect on the operation of the steering system, there is difficulty in starting the steering wheel and the possibility of serious malfunctions in some components of the servo system. Also, power steering fluid is highly flammable and if it gets on a hot engine or an exhaust system it can cause a fire. That is why it is necessary to discover and eliminate the cause of fluid loss and perform the procedure of bleeding the steering system

When a power steering fluid leak is suspected, with the ignition off, wipe the exterior of the power steering pump, reservoir, pressure hose, return hose, radiator, and steering gear. Then the engine is started and the steering wheel is turned to one side and the other several times. The engine is turned off and diagnosing power steering fluid leakage. It may be necessary to re-check for leaks after a period of driving. While diagnosing a power steering fluid leak, look at the hoses for signs of bloat. Always replace power steering hoses with the correct replacement hose. Never attempt to repair or seal a leak at a hose or fittings.

Another method uses standard fluorescent dyes. Following the instructions, the appropriate amount of paint is added to the reservoir of the power steering fluid. After the recommended driving time, all servo system components are inspected with an ultraviolet lamp, which will illuminate the fluorescent paint and make it easier to spot leaks.

To diagnose a power steering fluid leak, follow these steps:

Cleaning the steering system

Clean the exterior of the steering pump and the power steering fluid reservoir, then all the hoses and their connections. Finally, clean the hydraulic distributor of the steering wheel. Use suitable degreasing and cleaning agents for very dirty places.

Preparing the steering system for testing

Start the engine and turn the steering wheel several times to one side and the other all the way. If necessary, let the vehicle drive for several days before inspecting the power steering system for leaks.

Diagnosing power steering fluid leakage

Inspect in detail all elements of the steering system for leaks (steering pump, reservoir, pressure hoses, return hoses, radiator, and hydraulic steering distributor). If you notice that any hose is damaged or swollen, replace it with a new suitable hose.

Diagnosis of leaks with a UV lamp

If no fluid leakage is detected and it is still suspected that this is the cause of fluid loss, perform an inspection with a UV lamp. Pour the appropriate amount of fluorescent dye into the steering fluid reservoir. After the recommended driving period, inspect the power steering system with a UV lamp.