On Dec 27, 8:58*pm, BAR wrote:
Eisboch wrote:
"Short Wave Sportfishing" wrote in message
.. .
When I talked to the Service Manager, he mentioned something about
losing vacuum pressure. *I said what? *I'm trying to figure that one
out - brakes shouldn't be controlled by vacuum pressure - I always
thought they ran off the power steering assist pump.

It's not "vacuum pressure", but doesn't the power brake system operate off
of engine vacuum? *I haven't checked new vehicles but I think the older ones
did.

The newer ones do run off of vacuum pressure.

Off a vacuum pump.

Tim wrote:
On Dec 27, 8:58 pm, BAR wrote:
Eisboch wrote:
"Short Wave Sportfishing" wrote in message
...
When I talked to the Service Manager, he mentioned something about
losing vacuum pressure. I said what? I'm trying to figure that one
out - brakes shouldn't be controlled by vacuum pressure - I always
thought they ran off the power steering assist pump.
It's not "vacuum pressure", but doesn't the power brake system operate off
of engine vacuum? I haven't checked new vehicles but I think the older ones
did.
The newer ones do run off of vacuum pressure.

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.

BAR wrote:
Tim wrote:
On Dec 27, 8:58 pm, BAR wrote:
Eisboch wrote:
"Short Wave Sportfishing" wrote in message
...
When I talked to the Service Manager, he mentioned something about
losing vacuum pressure. I said what? I'm trying to figure that one
out - brakes shouldn't be controlled by vacuum pressure - I always
thought they ran off the power steering assist pump.
It's not "vacuum pressure", but doesn't the power brake system
operate off
of engine vacuum? I haven't checked new vehicles but I think the
older ones
did.
The newer ones do run off of vacuum pressure.

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.


Doesn't the transmission also use vacuum pressure in some manner?

Reginald P. Smithers III wrote:
BAR wrote:
Tim wrote:
On Dec 27, 8:58 pm, BAR wrote:
Eisboch wrote:
"Short Wave Sportfishing" wrote in message
...
When I talked to the Service Manager, he mentioned something about
losing vacuum pressure. I said what? I'm trying to figure that one
out - brakes shouldn't be controlled by vacuum pressure - I always
thought they ran off the power steering assist pump.
It's not "vacuum pressure", but doesn't the power brake system
operate off
of engine vacuum? I haven't checked new vehicles but I think the
older ones
did.
The newer ones do run off of vacuum pressure.

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.


Doesn't the transmission also use vacuum pressure in some manner?


On some Ford transmissions it does. I had a C4 transmission that had the
modulator valve's diaphragm rupture and start sucking transmission fluid
into the intake manifold which produced a dense cloud of white smoke
behind me as I drove down the Interstate. Seven dollar part, back in the
day, and it could have ruined my transmission if I had kept driving.

On Dec 27, 11:56*pm, BAR wrote:
Tim wrote:

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.

When did ford start pulling a vac, from the intake manifold? AFAIK,
they've always used a pump

"Tim" wrote in message
...
On Dec 27, 11:56 pm, BAR wrote:
Tim wrote:

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.

When did ford start pulling a vac, from the intake manifold? AFAIK,
they've always used a pump

Maybe you are thinking of the "air" pump that was installed in all cars to
inject clean air into the exhaust to "improve" emission readings.

Engine vacuum has been used for years for power brakes and on older car's
features like flip-up headlights and even the windshield wipers (on really
old cars).

Eisboch

"Eisboch" wrote in message
...

"Tim" wrote in message
...
On Dec 27, 11:56 pm, BAR wrote:
Tim wrote:

Off a vacuum pump.

No pump, vacuum from the intake manifold is the source.

When did ford start pulling a vac, from the intake manifold? AFAIK,
they've always used a pump

Maybe you are thinking of the "air" pump that was installed in all cars to
inject clean air into the exhaust to "improve" emission readings.

Engine vacuum has been used for years for power brakes and on older car's
features like flip-up headlights and even the windshield wipers (on really
old cars).

Eisboch

Didn't you just love it when you stepped on the accelerator and wipers
slowed or stopped?

D.Duck wrote:
"Eisboch" wrote in message
...
"Tim" wrote in message
...
On Dec 27, 11:56 pm, BAR wrote:
Tim wrote:
Off a vacuum pump.
No pump, vacuum from the intake manifold is the source.
When did ford start pulling a vac, from the intake manifold? AFAIK,
they've always used a pump

Maybe you are thinking of the "air" pump that was installed in all cars to
inject clean air into the exhaust to "improve" emission readings.

Engine vacuum has been used for years for power brakes and on older car's
features like flip-up headlights and even the windshield wipers (on really
old cars).

Eisboch

Didn't you just love it when you stepped on the accelerator and wipers
slowed or stopped?




Only when going uphill, if memory serves.

--
George W. Bush - the 43rd Best President Ever!

"HK" wrote in message
...
D.Duck wrote:
"Eisboch" wrote in message
...
"Tim" wrote in message
...
On Dec 27, 11:56 pm, BAR wrote:
Tim wrote:
Off a vacuum pump.
No pump, vacuum from the intake manifold is the source.
When did ford start pulling a vac, from the intake manifold? AFAIK,
they've always used a pump

Maybe you are thinking of the "air" pump that was installed in all cars
to inject clean air into the exhaust to "improve" emission readings.

Engine vacuum has been used for years for power brakes and on older
car's features like flip-up headlights and even the windshield wipers
(on really old cars).

Eisboch

Didn't you just love it when you stepped on the accelerator and wipers
slowed or stopped?


Only when going uphill, if memory serves.

--
George W. Bush - the 43rd Best President Ever!

Up hill was the worst case scenario but even flat land heavy acceleration
was a problem. It did seem to vary somewhat depending on the car brand.

On Fri, 28 Dec 2007 08:27:28 -0500, "Eisboch" wrote:

Engine vacuum has been used for years for power brakes and on older car's
features like flip-up headlights and even the windshield wipers (on really
old cars).

Just reading through this, I now understand what you mean by vacuum
assist - I thought we were talking about a vacuum system like air
brakes.

My IH L-110 operated a ton of stuff off a vacuum pump - what a PITA.