There will be a reason why PSA & Renault use a totally different oil specifically for Electrohydraulic units. Improved wear protection, resists thermal breakdown, evaporation and foaming Provides continued high pump output, suitable for most power steering units. but Peugeot didn't because most likely the issue is the pump, not the rack. Always flush power steering fluid at recommended service intervals. When flushing power steering systems or replacing a rack and pinion, follow the manufacturer’s procedure. So a rack already exists with the "correct" seals they could have used across the entire range. Add 4 to 6 ounces of TRANS TUNE to steering fluid reservoir to condition fluid, clean sticky pressure valves, gears and pumps. Stop the engine and check the fluid level and refill as required. Lower the vehicle, start the engine and turn the steering wheel slowly from lock to lock. If Peugeot wanted to use conventional power steering fluid, they would have done because the 407 if equipped with a 2.7 HDi uses a conventional power steering pump. Slowly turn the steering wheel right and left, lightly contacting the wheel stops at least 20 times. Look for loose hose clips, damaged piping, and leaking seals on the pump body between the pump and its fluid reservoir. Itll get foamy when theres air in the system, as youre likely to have with a leak or a low fluid level. The power steering pump will cause a suction effect in the pump and then pressurise the system. The rest of the cars in the PSA range used conventional power steering fluid, there are absolutely no legacy throwbacks. Air got in my Power steering when mechanic knocked the power steering reservoir off. The 'foaming' you describe is almost certainly air getting into the system. However LHM fluid was only used on hydractive systems until 2000, where LDS fluid replaced LHM. Contains: Corrosion inhibitors To Help: Fight corrosive attack. LHM fluid came about as a replacement for LHS fluid from the 50's due to it's hygroscopic nature. Contains: Foam inhibitors To Help: Provide quiet, efficient pump operation.
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