2004 E350 6.0 Vacuum
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2004 E350 6.0 Vacuum
Hi All, I tried to search existing post but couldn't find one on vacuum for a 2004 E350 6.0 so please excuse the duplicate if one is out there.
I am experiencing a hard brake pedal. This happened about 4 months ago and it was the mechanical vacuum pump. After much busted knuckles and a bunch of nasty words - I replaced the pump and all was ok with the brakes. Now we have a hard pedal again but I am getting about 14in of vac at the vacuum manifold by the cowling. Is this a normal vacuum reading or do I have a bad pump AGAIN?!
Thanks
I am experiencing a hard brake pedal. This happened about 4 months ago and it was the mechanical vacuum pump. After much busted knuckles and a bunch of nasty words - I replaced the pump and all was ok with the brakes. Now we have a hard pedal again but I am getting about 14in of vac at the vacuum manifold by the cowling. Is this a normal vacuum reading or do I have a bad pump AGAIN?!
Thanks
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Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
Well.....technically since the 6.0 isn't a normally aspirated engine (turbocharged) it has no vacuum in the manifold. It uses a separate vacuum pump to operate the HVAC system. If TooManyToys sees this thread I'm sure he'll be able to weigh in and help you out since he's our expert in that area.
You may want to edit your thread title to indicate you're having a brake problem. Go to Edit/Go Advanced to edit your title.
You may want to edit your thread title to indicate you're having a brake problem. Go to Edit/Go Advanced to edit your title.
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Joined: Dec 2014
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From: Jersey Shore
The E-Vans have a totally different brake system then the pickups and kind of on the back burner for forward research. The last time we were actually involved in any development on them was in the early 90's.
However, you have mid 90's pickup tech, and the vacuum pump on those spec's at 17-21". During shortest stopping distance testing we were required to have 21" min.
Hanging out in the forum for that truck era should give you more hands on experience then here. But the system is pretty basic, booster needs a good diaphragm and check valve, the vacuum supply needs a good pump and hose.
If the hose checks out, where did you get the pump from?
However, you have mid 90's pickup tech, and the vacuum pump on those spec's at 17-21". During shortest stopping distance testing we were required to have 21" min.
Hanging out in the forum for that truck era should give you more hands on experience then here. But the system is pretty basic, booster needs a good diaphragm and check valve, the vacuum supply needs a good pump and hose.
If the hose checks out, where did you get the pump from?
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Bought the pump from AutoZone. They also had the puller that I borrowed for the pulley. I'm getting a steady 14-15" at start up directly from the pump and when I bring up the RPM it tops off at about 20-21". So from what your saying I seem to have a good pump. How can I check the canister diaphragm then?
Hotshot
Joined: Dec 2014
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From: Jersey Shore
I wouldn't say at idle 14-15" is good. The pickup min spec was 17", but I don't remember us ever getting that low (23 years ago). I believe we always were in the 20-21" range after the booster rapidly built back up after a stop.
Lead Driver
Joined: Mar 2010
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From: Woodbridge, Ontario, CA
Vacuum pumps are extremely common to go bad on these vehicles. Replaced more than my share. Was the previous vacuum pump replacement recent enough to have a parts replacement warranty left over? If so, I would claim it.
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I found my receipt for the last pump dated 3/1/17. Luckily I bought it at Advance Auto and they gave me a lifetime replacement warranty so that pump is getting ripped out and replaced. From what you guys have been telling me it isn't drawing a deep enough vacuum so it looks like the pump is the problem. Unfortunately it's a nasty job to replace it.
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Joined: Dec 2014
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From: Jersey Shore
It worth checking any hoses. I'm not sure what equipment you have available to check the system. We abused the heck out of vacuum boosters per our tests and never had a failure. With older Mustangs I used to find problem hoses.
We had a tool at work for testing vacuum boost systems but it stayed in the back of an old cabinet. It basically was a tee with a vac gauge off the 90, and the two straight ends were ball valves with hose nipples. And a tapered plug that you fitted in place of the booster check valve. Then set it up in series.
Establishing vacuum you could read what you were getting in the system, shut the valve on the vac source side and see if the booster dropped, and shut the booster side and reopen the source side to see what you were pulling. Systems that had a reservoir could be checked too. We just never needed it.
If Advance is the same with their vac pumps as with other rebuilt parts, you might be doing this a few times.
We had a tool at work for testing vacuum boost systems but it stayed in the back of an old cabinet. It basically was a tee with a vac gauge off the 90, and the two straight ends were ball valves with hose nipples. And a tapered plug that you fitted in place of the booster check valve. Then set it up in series.
Establishing vacuum you could read what you were getting in the system, shut the valve on the vac source side and see if the booster dropped, and shut the booster side and reopen the source side to see what you were pulling. Systems that had a reservoir could be checked too. We just never needed it.
If Advance is the same with their vac pumps as with other rebuilt parts, you might be doing this a few times.
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Joined: Dec 2014
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From: Jersey Shore
If you have anyway to check the system I'd encourage that first. Put on a Motorcraft rebuilt PS pump as a proactive situation before my original gave me issues, only to have it whine. So a redo and the second one also whined. Apparently they all do/did in the time frame I did mine, so I understand the frustration.
Lead Driver
Joined: Mar 2010
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From: Woodbridge, Ontario, CA
At that price, I would go back in with a Ford unit this time around. I believe I've seen some online for well less than that price. The part number from Ford is Motorcraft number BRPV-11 if it interests you.
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Joined: Dec 2014
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From: Jersey Shore
The vacuum pump on a pickup is different then the OP is discussing, it's electric and up on the passenger fender. The pickups use vacuum to control the HVAC operation, if 4x4 with electronic control, the hub engagement, and on some vehicles a valve that shuts off water flow to the heater when a/c is on.