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1998 Ford F-150 OIL PRESURE /BRAKES

Tiny
RODFORD
  • MEMBER
  • 1998 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
I can run my truck for about half an hour then my oil pressure drops and my brakes lock up I replaced brakes, calipers, power booster, master cylinder, oil pump and cats, still problem not solved and no engine light indicating there's a problem now funny thing happened I have a f 250 work truck that I drive same thing happened to it could barely get it into driveway so I know its not major because my work fixed the truck in a couple of days but I cant talk to the mechanics that fixed it and my boss lost the work order slip for the truck so I cant see what they did to it any suggestions
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Saturday, June 26th, 2010 AT 3:37 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
I'm sitting here trying to figure out how the two are related. Do you ever hear a knock or ticking from the engine when the pressure drops? As far as the brakes, do the lock up when you touch them easily?
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Friday, July 2nd, 2010 AT 10:11 PM
Tiny
RODFORD
  • MEMBER
  • 3 POSTS
It all happened one day when I was comming home the oil pressure droped and I started smelling the brakes a few minutes later I had to pull of the road after it cooled down everything was fine I made it home but it started all over again as soon as the engin started getting hot again so I started with the obviouse things first I did a full tuneup changed the oil and oil pump and the brakes took it out the next day same thing so I tried the master cylendar and the power booster same thing so then I replaced both callipers/ hoses same thing happened then I totally disconected the abs thinking there might be a problem in the control unit with the dump valve and isolation valve still nothing then I noticed after working on it one night the cats were glowing so I replaced cats nothing is working ive been working on cars for 20 years and I do everything thats suposed to be done like bench bleeding the master cylendar making sure the rod for the power boster is correct bled the whole brake system from back to front 3 times no water or metal shaveings in the oil or stuck to the oil plug theres no knocking from the bottom end of the motor as if I would have a worn or sliped main bearing and like I mentioned in my firs letter my work truck did the same exact thing I even called my wife out to look at it because I thought I was loosing my mind with that truck doing the same exact thing and after it came out of the shop it works fine and I know my boss knows that they didnt do anything major to the engine although he couldent find the repair slip so he could tell me what they did so at this point im still lost as to what is going on with it
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Monday, July 5th, 2010 AT 10:06 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
You have me stumped. You have covered everything I can think of. I am going to pass this post on to a different tech who may have a better idea.

Joe
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Monday, July 5th, 2010 AT 6:49 PM
Tiny
RODFORD
  • MEMBER
  • 3 POSTS
Thanks Joe for your time I appriciate you trying to help
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Tuesday, July 6th, 2010 AT 10:56 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
I wish I could have done better, but you have me stumped. Someone should be getting in touch with you. Let me know if no one does.

Joe
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Tuesday, July 6th, 2010 AT 3:44 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When the brakes are actually locked up this will cause the engine oil pressure to drop due to severe engine speed reduction. There's something else that causing the problem here other than oil pressure

I would like to be informed if this problem is resolved something new in all the 40yrs in this business. Get in touch-You got me scratching all over and I ain't got that much to pull from the top side-

Sorry not that much of a help-Its okay if its a GM product that relates to power steering pump pressure-
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Tuesday, July 6th, 2010 AT 5:12 PM
Tiny
RODFORD
  • MEMBER
  • 3 POSTS
First of all I would like to thank you guys for your time and I apologize for not offering a donation to you but I'm currently laid off I'm just trying to figure out whats going on with this truck when I'm in a better financial situation ill definitely give a donation thanks again for your time trying to give me a answer to this almost impossible problem thanks again God Bless
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Tuesday, July 6th, 2010 AT 7:20 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
We are glad to help, and hope we can help you in the future. Remember, we are here to help and understand your current situation. It's hard to recognize our country anymore. I wish you luck finding work.

Joe
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Wednesday, July 7th, 2010 AT 9:52 PM

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