Electric brake servo vacuum pump?

[caprilaser]

I've put a Yb turbo in my cortina and am looking at the options for keeping my brake servo. As there won't be enough vacuum from the inlet manifold I was thinking of using an electric vacuum pump if I can find one. Does anyone know of any cars that were fitted with then as standard? Electric cars use them apparently but theres not an abunance of them in scrappy's round here! I read sierra/granada's might have had em but can't be sure where I read it now. You can buy kits from the USA but they are pretty pricey...

I know you can just remove the servo but I'd need a new brake master cylinder etc and it seems more hassle than just wiring in a pump!

Cheers Tom

[Fiesta Steve]

I may be being daft here but why wouldn't their be enough vacuum in your inlet manifold ??

[caprilaser]

Hi steve, due to the turbo the manifold pressure will be possitive when on throttle (Cossies didn't have a vac from the manifold they had a seperate abs pump setup). I know you don't usually have the throttle open when you are braking but as far as I know the servo won't work properly if used off the manifold presure.

[GT_lenny]

the old pug 1.9 diesels had quite a small neat little vac pump which i'm sure could be run off the fan belt

[Fiesta Steve]

Hi steve, due to the turbo the manifold pressure will be possitive when on throttle (Cossies didn't have a vac from the manifold they had a seperate abs pump setup). I know you don't usually have the throttle open when you are braking but as far as I know the servo won't work properly if used off the manifold presure.

 

Ok, thats what I thought, you only (usually) brake with the throttle shut and thought there must be a vacuum in the manifold ??..

 

I turbocharged an RS 1600i once and the servo worked fine, don't know if that would be the same.

[V8ian]

V-----ll Astra Diesels have a vac pump built into the alternator, so do transits I think

[bortaf]

I've seen the 5ierra ABS unit with it's leccy pump and master on some 24V conversions with the ABS disconected, pretty sure there's a thread with it in on BSC

[caprilaser]

Cheers for the replies, I'll have a lsearch on the BSC forum Bortaf, thanks mate!

[rallyesport04]

saab 95 had leccy vac pumps

[Tom]

seems like a lot of trouble to go to when you can run it off the manifold

[caprilaser]

Thanks, think I've found a Saab one that'll work, worth a go anyway!

[bortaf]

Cheers for the replies, I'll have a lsearch on the BSC forum Bortaf, thanks mate!

It'll be a thread with do-it-sideways in it, he build 24V cortina for a living, he uses the 5ierra master with the ABS disconnected all the time

 

Opps see youve got one

keep us informed

[rallyesport04]

seems like a lot of trouble to go to when you can run it off the manifold

 

turbo manifolds dont vac all the time so the servo assist wouldnt work as well as it could using a electric unit the servo assist will always be at max

[Sheepy]

Volvo! electric vac pump.

fitted one to my mates suzuki 4x4 diesel a few weeks ago!

but you will need a vacuum presure switch, or the pump will run all time, or just when you brake, depending on how you wire it!

[caprilaser]

I've got a SAAB one coming in the next day or so to try out, also found a SAAB pressure switch too on ebay for a few quid that I should hopefully be able to rig up to work with it. I'll let you know how it goes!