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Post a reply to the thread: Vacume pump
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Originally Posted by kapri
Most of those pumps require an external oil supply as well Vince.
its ok vince has plenty of EXTERNAL oil supply
they all leak at some point
see - idle hands
Ok, Ive let the cat out the bag
I have no idea what promted this question apart from me breaking the old diesel 7 seater in the garden and was wondering if it would work
Just had another thought. GMC and Chevy diesel V8 heavy duty trucks and vans run Hydro Boosters that take hydraulic power from the steering pump.
These systems have been used for pro-touring and circuit race cars but probably serious Overkill for the average car!
My old mans Corvette doesn't have servo assistance, brakes are heavy but you can live with it.
Some '60s GM muscle cars had the option of non-servo disc brakes. A buddy ran these on a '67 automatic Firebird and said they worked quite well. If lack of vacuum is the problem one of these non power master cylinders might be an easier fix.
On the V and S series it is to do with the VVT set up . My understanding is that at initial start up and runing the engine produces insufficient vacuum to work the brakes.
Volvo also used them on the 760Turbo series , after some research they are an AC Delco unit used on some Cavaliers in the States also available new frm MP Brakes.
Some info about on them on electric vehicle sites where they need an electric pump to run the servo assist .
I have to agree about a lot of modern stuff being horribly over assisted.
Yeah thats a point, mine was a manual, but the current car is an auto with a vacuum modulator. Be interested to know more about those Volvo's having additional pumps, you'd expect the cam timing not to be an issue, unless it's something to do with ridiculous emissions piping cocking it all up. Have you noticed though how some modern cars have really powerful servo assistance, perhaps they just want the brakes to be as light as possible.
On autos it can play havoc if you are still running a vacuum modulator on the gearbox though. Even some modern cars run electrical vacuum supplement pumps due to problems with cam timing , Volvo V and S range.
I had an engine with a lack of vacuum from a wild cam on one of my old cars. It only was an issue when manoeuvring the car at idle say in a carpark or something. A blip of the throttle saw the servo get regenerated.
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