Strange noises from brake pedal

mrlozza · Mar 14th, 2010, 19:25

Dear All,

I'm a new forum member with a problem (car, not me). I have a 2003 XC90 D5 which I guess is one of the first of the line. It has 76000 miles on the clock.

There is a hissing/whooshing noise (like air escaping from somewhere) when I release the brake pedal followed immediately by a squeal/squeak sound. There are no noises when pressing the pedal or while just driving along but the noises occur whenever you release the brake pedal after stopping or slowing down. Does anyone know what this could be?

Also, another quick question of I may....is it safe to change one of the rear shocks (self levelling ones I think) or should they be changed in pairs>

Thanks for any help you can provide.

paul chocks · Oct 26th, 2010, 22:53

Did you ever get an answer to the hissing sound? My car has just started doing this too, but with no squeak.

marconi 50 · Oct 26th, 2010, 23:56

you need to get vehicle checked out poss issue with brake servo

marconi 50 · Oct 26th, 2010, 23:58

sounds like issue with brake servo requires immediate inspection for saftey issues

ian b · Oct 27th, 2010, 21:28

got the same problem with mine, took it to a volvo garage which confirmed it was the servo working and is not a major problem, so carried on driving and after a couple of weeks noise has gone and i had no braking problems either, bit of a mystery, mines a 2003 xc90 aswell

paul chocks · Oct 27th, 2010, 22:29

Interesting - Mine's going in to an indie tomorrow. I've lost no braking at all, and everything seems to work as it always has, but I'd hate to lose all servo pressure suddenly as its a heavy car to stop without assistance. As its my wife and kids main car, I'm reluctant to leave it a few weeks to see what happens!

I'll see what the guy says tomorrow, although by his own admission, he's never heard of this in an XC90 before. If it is a duff servo, it'll be pretty pricey I'm sure.

ian b · Oct 29th, 2010, 20:17

paul any info on the strange braking noise, did they give any ideas has to the noise, has i said mine has gone but just curious about the outcome, if it is a new servo, and you have had it done, is there a difference

paul chocks · Nov 1st, 2010, 22:31

Ian, it looks as if it is indeed the brake servo. Although rare on the XC90, it is apparently quite common on the V70. There is a seal inside the servo which can tear after time, giving the hissing sound. Unfortunately the unit is a sealed unit, so repair entails fitting a whole new servo. Part from Volvo is about £350, although I found a breaker who has one for £140. I'm going for the new part, fitted by an indie this weekend hopefully.

My "hiss" seems to have got worse over the last few days.

400-ascona · Nov 2nd, 2010, 18:55

I have a servo for sale if anyone needs it. Its from a 2005 T6, but assume they are the same (would need to check first).

ian b · Nov 2nd, 2010, 20:55

what price for the servo if it is the same... can collect

Mar 14th, 2010, 19:25	#1
mrlozza New Member Last Online: Mar 15th, 2010 15:39 Join Date: Mar 2010 Location: Camberley	Strange noises from brake pedal Dear All, I'm a new forum member with a problem (car, not me). I have a 2003 XC90 D5 which I guess is one of the first of the line. It has 76000 miles on the clock. There is a hissing/whooshing noise (like air escaping from somewhere) when I release the brake pedal followed immediately by a squeal/squeak sound. There are no noises when pressing the pedal or while just driving along but the noises occur whenever you release the brake pedal after stopping or slowing down. Does anyone know what this could be? Also, another quick question of I may....is it safe to change one of the rear shocks (self levelling ones I think) or should they be changed in pairs> Thanks for any help you can provide.

Nov 2nd, 2010, 18:55	#9
400-ascona Premier Member Last Online: Today 10:21 Join Date: Mar 2008 Location: Derby	I have a servo for sale if anyone needs it. Its from a 2005 T6, but assume they are the same (would need to check first). __________________ 1997 V70R AWD, Saffron, Manual; Lotus Carlton; Ascona 400; Mini Cooper S Works; 4.2 Supercharged Range Rover; Mercedes C63 AMG Estate; Suzuki GSF1200N; BMW R80/7; Velocette Venom; Daimler V8 250.

Oct 26th, 2010, 22:53	#2
paul chocks Junior Member Last Online: Dec 2nd, 2022 10:25 Join Date: Jul 2009 Location: newbury	Did you ever get an answer to the hissing sound? My car has just started doing this too, but with no squeak.

Oct 26th, 2010, 23:56	#3
marconi 50 New Member Last Online: Oct 27th, 2010 00:19 Join Date: Sep 2009 Location: warrington	you need to get vehicle checked out poss issue with brake servo

Oct 26th, 2010, 23:58	#4
marconi 50 New Member Last Online: Oct 27th, 2010 00:19 Join Date: Sep 2009 Location: warrington	sounds like issue with brake servo requires immediate inspection for saftey issues

Oct 27th, 2010, 21:28	#5
ian b New Member Last Online: Jan 1st, 2011 12:20 Join Date: Jul 2010 Location: nottingham	got the same problem with mine, took it to a volvo garage which confirmed it was the servo working and is not a major problem, so carried on driving and after a couple of weeks noise has gone and i had no braking problems either, bit of a mystery, mines a 2003 xc90 aswell

Oct 27th, 2010, 22:29	#6
paul chocks Junior Member Last Online: Dec 2nd, 2022 10:25 Join Date: Jul 2009 Location: newbury	Interesting - Mine's going in to an indie tomorrow. I've lost no braking at all, and everything seems to work as it always has, but I'd hate to lose all servo pressure suddenly as its a heavy car to stop without assistance. As its my wife and kids main car, I'm reluctant to leave it a few weeks to see what happens! I'll see what the guy says tomorrow, although by his own admission, he's never heard of this in an XC90 before. If it is a duff servo, it'll be pretty pricey I'm sure.

Oct 29th, 2010, 20:17	#7
ian b New Member Last Online: Jan 1st, 2011 12:20 Join Date: Jul 2010 Location: nottingham	paul any info on the strange braking noise, did they give any ideas has to the noise, has i said mine has gone but just curious about the outcome, if it is a new servo, and you have had it done, is there a difference

Nov 1st, 2010, 22:31	#8
paul chocks Junior Member Last Online: Dec 2nd, 2022 10:25 Join Date: Jul 2009 Location: newbury	Ian, it looks as if it is indeed the brake servo. Although rare on the XC90, it is apparently quite common on the V70. There is a seal inside the servo which can tear after time, giving the hissing sound. Unfortunately the unit is a sealed unit, so repair entails fitting a whole new servo. Part from Volvo is about £350, although I found a breaker who has one for £140. I'm going for the new part, fitted by an indie this weekend hopefully. My "hiss" seems to have got worse over the last few days.

Nov 2nd, 2010, 20:55	#10
ian b New Member Last Online: Jan 1st, 2011 12:20 Join Date: Jul 2010 Location: nottingham	what price for the servo if it is the same... can collect

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