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So started car up but when idleing there was a buzzing noise, when brake pedal pressed the noise changed, so definitely an electrical noise. Found that noise was coming from n/s rear, is there a fuel pump located in hat area? Seems odd if there is, as the turbo wastegate is that side??

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The only thing electrical about your brake pedal is the brake lights. 

It will change in sound. Normally it’s sucking into a closed pipe - when you press the pedal the servo bleeds it off to atmosphere - changing the load on the pump - and changing the sound. jack t

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Probably not - you will find other posts about it. As long as your brakes work 👍

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ABS only makes a difference if you lock the wheels up. If the pedal has gone hard, you're getting less servo assistance which is more than likely due to not enough vacuum. It's easy enough to measure, have it checked out mate. On my NA and SE the belt which drives the vacuum pump was also on the water pump so when mine failed it was shown by rapidly increasing temps as well as a rock hard brake pedal. 

 

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

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Stick a vacuum guage on the vacuum pipe by the brake servo. Typical it should be between 0.67-0.71 bar of vacuum. A servo will work from 0.4 bar which is why you have a pump as the manifold vacuum isn’t sufficient 

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From underneath it's not impossible but not a walk in the park. It's not that easy to get to and easier to remove if you take the pulley off first. There's more chance of there being a leak in one of the vacuum pipes to be honest which is why checking the vacuum level at certain points is better. When the pumps start to fail they make a noise like a duck! 

It's bottom right here, you can see the belt on the water pump above it too which I mentioned earlier.

 

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

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On 21/05/2020 at 21:53, esprit22 said:

So started car up but when idleing there was a buzzing noise, when brake pedal pressed the noise changed, so definitely an electrical noise. Found that noise was coming from n/s rear, is there a fuel pump located in hat area? Seems odd if there is, as the turbo wastegate is that side??

Is there a vacuum pump on an 86 turbo? From your first post, yes the fuel pump is close to the n/s fuel tank under the car and this buzzes constantly when ignition is on. This is normally drowned out by engine noise when idling but easy to jack car up and have a listen. 

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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No - it’s belt driven - but has an exhaust hose - which is often routed along the chassis pipes.

get under there and have a look

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The only thing electrical about your brake pedal is the brake lights. 

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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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  • Gold FFM

It will change in sound. Normally it’s sucking into a closed pipe - when you press the pedal the servo bleeds it off to atmosphere - changing the load on the pump - and changing the sound.

jack the car up and have a proper look !!

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Normally a length of pipe is cabletied to the chassis and routed by where the driveshaft is 

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On 24/05/2020 at 04:20, esprit22 said:

No, this is electrical, as when pressing brake pedal the tone changes 

If you had a bad earth connection, the electrical supply level to the fuel pump could change when the brake lights are applied. Possible but not impossible. 

Bad earthing has weird and unexpected effects.

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