Servo experts help

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Servo experts help

Postby badobsession » Sun Mar 22, 2020 8:07 pm

Ok guys do your stuff I will ask of the experts on this page first as I know someone will know
First I will tell you what I have tried
Changed the servo
Changed the master cylinder
Forced bled the brakes

Still a poor brake and they used to be xterm good 110% on the mot a few years ago
It’s been poor since the engine change now running turbo diesel
We have had to adulterous the vacuum take off and it now comes off the air plenum
It is getting a vacuum but I think it’s not as good as the fiat set up
I had tried setting up an electric vacuum pump set up but found this to be very unreliable
At least I know the brakes will work if not the best but with the pump it was if buts and maybe
I had it wired up as per the manufacturer’s info as it was consent on and switched off with a vacuum switch

I was wondering if I can rig it up to add extra vacuum only when I brake by wireing it up off the brake light switch
With a relay
Any idea how this would work
Anyone had similar issues with a diesel
Thanks
do what you like and like what you do ...

And life is to short to drive boring cars.
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Re: Servo experts help

Postby Panky » Sun Mar 22, 2020 10:31 pm

No idea about the electrics side of things sorry, but would fitting a vacuum reservoir help?
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Re: Servo experts help

Postby Sleeper » Mon Mar 23, 2020 6:06 am

With a pump powered by the accessories/ignition live via a pressure switch , keeping the vacuum topped up..

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Re: Servo experts help

Postby chesney » Mon Mar 23, 2020 10:08 pm

I don't know about turbo diesels, but generally diesels don't make as much of a vacuum as petrol engines do, by virtue of design. Every diesel vehicle I have worked on with servo brakes has a vacuum pump (mechanical or electrical) or a valve in the inlet to try and generate vacuum.
What engine is it, what is it out of, and does it have a vacuum pump?
You might have more luck with a vacuum tank and non return valve.
You can use a Hella electric vacuum pump (I have a Hella.UP28, was in a lot of Volvos if I remember rightly) wired up to the brake light switch, which works, but it's not very sudden, it takes a lot of getting used to since the pedal feel fluctuates while braking. I'm currently looking for something like a Vauxhall Frontera alternator for mine, which has a conventional single pulley system to suit my needs with a fan belt, but a vacuum pump at the rear, just a matter of fabbing brackets and running an oil feed and return.
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Re: Servo experts help

Postby Sleeper » Tue Mar 24, 2020 6:00 am

I think there is a clue here..

" It’s been poor since the engine change now running turbo diesel "

Bing force-fed , do they create Vacuum ?

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Re: Servo experts help

Postby chesney » Tue Mar 24, 2020 7:15 am

Sleeper wrote:I think there is a clue here..

" It’s been poor since the engine change now running turbo diesel "

Bing force-fed , do they create Vacuum ?

John ;-)

A turbo will actually push air out of the manifold rather than pull it.

Even a naturally aspirated diesel makes.no vacuum, there's no throttle on a diesel as the engine RPM is changed by adding more fuel at injectors, rather than fuel/air mix via throttle on a petrol. My Land Rover 2.25 diesel NA, if it had a stock setup, had a butterfly valve at the start of the inlet to create vacuum, this was attached to the throttle pedal and needed careful adjustment to make sure that enough air would pass yet vacuum could be created, it's a pretty poor system.
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