Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
Thanked 59 Times in 57 Posts
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I agree, hydro boost unit failing.
The power steering pump has to supply pressure to both the steering gearbox (not rack) and power brake hydro boost unit, and if the valve in the hydro boost unit that prioritizes the fluid pressure isn't working correctly, you get funny break and steering issues.
Our excursion needs the hydroboost replaced, it wants to pull to one side or the other randomly when the brakes are applied. Another symptom is hard steering when stopped, brakes applied, IE: parking lot maneuvers.
Edit: Reply posted before reading the 2nd page of posts, which include more information and further questions/answers. Sorry.
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E'99 F250 extcab, S/Bed 223k. W/ 378k mile 7.3 motor installed at 212k
'00 Excursion Limited, 7.3PSD 308k
'02 F250 extcab, L/bed, 340k. 7.3L 6spd 4x4
'00 F250 CCSB, 5.4 gasser 235k
200? F250 SuperDuperDuty Extended crew cab short bed project in process w/ 3rd row seating. 7.3L, 6spd, 4x4
Last edited by dieselcrawler; 11-14-2019 at 06:20 AM.