1986 F800 Brake problem
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New User
Joined: Aug 2008
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From: Canfield, Ontario
1986 F800 Brake problem
My 1986 F800 with a 429 4v is giving me all kinds of problems with the buzzers.
I am getting a light on the dash for the EGR and the brakes.
I can't find any diagrams or books anywhere to diagnose problems, or parts.
I can see a part that is leaking red fluid(no idea) it is a part that is beside the master cyl. and it has a wire coming down from it.
It looks like a sensor of some kind, bit it resembles a spark plug???
I know sounds weird?
ANY help would be great?
I am getting a light on the dash for the EGR and the brakes.
I can't find any diagrams or books anywhere to diagnose problems, or parts.
I can see a part that is leaking red fluid(no idea) it is a part that is beside the master cyl. and it has a wire coming down from it.
It looks like a sensor of some kind, bit it resembles a spark plug???
I know sounds weird?
ANY help would be great?
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Joined: Jan 2001
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From: Virginia
Finding info on the big trucks is difficult. I would search the internet for a book you could buy. Possibly one would show up on ebay. I find it hard to believe a truck that large has a EGR, but I don't know that particular model. Your 429 is not like the early Ford 429 either is it? Isn't that a special truck engine?
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New User
Joined: Aug 2008
Posts: 10
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From: Canfield, Ontario
I am not too sure.
This is what I am trying to find out?
I know even the big truck Ford dealer has no idea.
I bought it in June of this year, and still have found nothing.
It was originally a fire truck, and built for the fire dept. from Ford.
So who knows what they did?
This is what I am trying to find out?
I know even the big truck Ford dealer has no idea.
I bought it in June of this year, and still have found nothing.
It was originally a fire truck, and built for the fire dept. from Ford.
So who knows what they did?
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Joined: Apr 2004
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EGR might help avoid detonation etc as well as be a smog thing for this truck. There are tubes & valves etc that can go bad and cause this issue. Now hold that thought, as the EGR can wait until you get a way to get more info or find a shop that can help.
That "plug" looking thing near the brake booster. That IS into the master cylinder casting or other component connected to the brakes, correct?
This would be a pressure switch. Since it is leaking, it needs to be replaced and that will probably take care of your brake light.
I love how a 'big truck Ford dealer' wouldn't have a clue about an '86....
The 370/429 "Lima" truck engines differ in a couple of ways from car 429s, but it's the same basic engine.
Get out the Yellow Pages and find a shop that works on these.
Numberdummy on this site will be able to direct you to a source for either a book or cd or dvd for parts info and possibly more.
Good luck.
That "plug" looking thing near the brake booster. That IS into the master cylinder casting or other component connected to the brakes, correct?
This would be a pressure switch. Since it is leaking, it needs to be replaced and that will probably take care of your brake light.
I love how a 'big truck Ford dealer' wouldn't have a clue about an '86....
The 370/429 "Lima" truck engines differ in a couple of ways from car 429s, but it's the same basic engine.
Get out the Yellow Pages and find a shop that works on these.
Numberdummy on this site will be able to direct you to a source for either a book or cd or dvd for parts info and possibly more.
Good luck.
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New User
Joined: Aug 2008
Posts: 10
Likes: 1
From: Canfield, Ontario
You know it's funny you say it is a perssure switch, because that is what I told the dealership it might be.
They had every book, cd, and microfiche they could find in that building.
I guess if they knew what it was thay would not of passed it through the safety check.
I do hear a whistle when I am driving ever since I replaced the carb, and have again drove myself nuts replacing all kinds of vacuum hoses.
I do not get a whistle when I am parked and rev the engine, only when I am under load and driving.
They had every book, cd, and microfiche they could find in that building.
I guess if they knew what it was thay would not of passed it through the safety check.
I do hear a whistle when I am driving ever since I replaced the carb, and have again drove myself nuts replacing all kinds of vacuum hoses.
I do not get a whistle when I am parked and rev the engine, only when I am under load and driving.
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