S80 hissing noise

Kev0607 · Apr 13th, 2019, 00:03

2007 S80 2.4 D

Hi all,

I can hear a hissing noise in my car, which is certainly more prominent when the radio is off. It stops once I press the brake pedal & starts again as soon as I release it. If you don't touch the pedal at all, like if the car is idling as an example, the hissing noise is constant.

What could this be & is it an expensive fix? The brakes themselves seem fine - The pads still have plenty of life in them, the brake fluid looks clean & the level is fine. I would say that the brake pedal feels a tad spongy if I'm being honest, but nothing what I'd consider out of the ordinary considering larger cars tending to have that softer pedal/smoother braking action.

Any suggestions are much appreciated.

Tatsfield · Apr 13th, 2019, 10:23

Sounds like a vacuum leak from the servo, but someone who knows Volvos specifically could confirm that.

37 RUBY · Apr 13th, 2019, 13:14

Quote:

Originally Posted by Tatsfield

Sounds like a vacuum leak from the servo, but someone who knows Volvos specifically could confirm that.

Nail on the head.

Not same car but similar so these videos may be of use for noise comparison.

https://m.youtube.com/watch?v=cBWpakOaVD0

https://m.youtube.com/watch?v=2SBZT8Dw7qw

Kev0607 · Apr 18th, 2019, 23:13

It looks like a fiddly job, but it sounds like air is leaking from the rubber boot like that video. I imagine labour wise it wouldn't be cheap either.

Its probably best getting it looked at by a garage.

Apr 13th, 2019, 00:03	#1
Kev0607 Premier Member Last Online: Yesterday 15:21 Join Date: Apr 2019 Location: Manchester	S80 hissing noise 2007 S80 2.4 D Hi all, I can hear a hissing noise in my car, which is certainly more prominent when the radio is off. It stops once I press the brake pedal & starts again as soon as I release it. If you don't touch the pedal at all, like if the car is idling as an example, the hissing noise is constant. What could this be & is it an expensive fix? The brakes themselves seem fine - The pads still have plenty of life in them, the brake fluid looks clean & the level is fine. I would say that the brake pedal feels a tad spongy if I'm being honest, but nothing what I'd consider out of the ordinary considering larger cars tending to have that softer pedal/smoother braking action. Any suggestions are much appreciated.

Apr 13th, 2019, 10:23	#2
Tatsfield Premier Member Last Online: Yesterday 10:10 Join Date: Nov 2015 Location: Poole	Sounds like a vacuum leak from the servo, but someone who knows Volvos specifically could confirm that. __________________ 2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey

Apr 18th, 2019, 23:13	#4
Kev0607 Premier Member Last Online: Yesterday 15:21 Join Date: Apr 2019 Location: Manchester	It looks like a fiddly job, but it sounds like air is leaking from the rubber boot like that video. I imagine labour wise it wouldn't be cheap either. Its probably best getting it looked at by a garage.

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