Question about 1999 Volvo S80

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  • Anonymous Aug 02, 2008

    Servo leaks air at brake pedal.when pedal is depressed

  • Kevin Fraser Aug 13, 2008

    02 plate Volvo S80 se auto D5, hissing/leaking air noise when pressing brake pedal

  • Kevin Fraser Aug 13, 2008

    02 plate Volvo S80 SE Auto 2.4 D5. Hissing/leaking air when pressing brake pedal

  • Anonymous May 07, 2009

    Hissing comming from brake booster.


2 Answers

Replace The Brake Booster.

Posted on Oct 05, 2008

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Vovlo s80 2.9 1998 air leaking from servo from brake pedal really hard brakes. will this need servo replacing thanks

Posted on Jan 04, 2010

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1 Answer

My brake pedal will not budge, and a hissing noise present when running

The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:


Jan 27, 2016 | 1989 GMC Sierra

1 Answer

Hi renault scenic 2l auto 2002. another common problem.

hissing noise is a leaking diaphram inside power brake have to replace the power brake booster.

Sep 18, 2012 | Renault Megane Cars & Trucks

2 Answers

My 1988 jeep cherokee takes way to long to stop.The brakes are fine, i had them checked. The pedal wont go down all the way.It seems like you literally have to stand on the brake pedal,then it will...

Check the power booster in the braking system. You may also have air in your brake lines and this will need to be bled out by a competent mechanic.

Aug 17, 2010 | 1988 Jeep Cherokee

1 Answer

Sounds like air leaking when you press down the brake pedal

thats normal ,could be the filter in teh servo needs a clean ,its at the end opf the brake push rod where it goes into the servo ,a foam sponge filter ,clean it out

Mar 19, 2010 | 1994 Dodge Caravan

1 Answer

My 1992 cavalier shakes while idleing in gear with foot on break but stops while in motion or idleing in park?

hi from uk the symptoms you clearly describe sound like your brake servo /vacuum cylinder is at fault ie whilst brake pedal is off all is ok ? but when pedal pressed engine falters? this is a sign that the seal on the vac piston inside the servo unit is allowing air /atmospheric air to enter the servo as you brake and this assists braking however when inner pistonseal is leaking at some point inside the servo bore ie a scoared or rusty point ?the atmospheric air passes the piston/seal and so the vacuumpipe to servo is drawing this air into inlet manifold resulting in upsetting fuel mixture ie weak too much air ratio to fuel resulting inshaking engine you describe ? try this?? if you disconnect vac pipe from servo unit then seal off the pipe with thumb then ask assistant to start engine then it should run ok ? also it should be ok when b/pedal pressed remember there will be no vac assistance ?? if above test prove right ? then you will req a new servo unit only not complete master cylinder too ? you can diy this then bleed brakes after replacing servo ? hope this helps

Feb 27, 2010 | 1992 Chevrolet Cavalier

2 Answers


brake master cylinder is mounted on brake servo under bonnet . remove the metal brake pipes going to it remove 2 nuts holding it to servo remove from car fit new one fill with brake fluid dont connect pipes yet have assistant pump pedal when fluid flows out of all ports on cyl get assistant to hold pedal down now fif pipes and secure try pedal if it feels firm job done if not you willneed to bleed the whole system

Feb 06, 2010 | 2001 Volvo S40

1 Answer

Hear air sound inside car when i brake

seal gone on servo unit ,but if not leaking when engine running leave well alone ,look up at the end of the pedal shaft and look for a foam seal ,this is the air filter for the servo clean it if you can get to it ,this might reduce the noise

Jan 03, 2010 | Mercedes-Benz ML320 Cars & Trucks

2 Answers

Brakes dont work

u need brake booster

Nov 01, 2009 | 1997 Volvo 960

1 Answer


This is, without doubt, your Brake servo unit. The diaphram is leaking, hence the noise. You will have to get part number V30793673-2, Cost me €500 in Ireland. No repair available, and a bit difficult to install too....

Jun 24, 2009 | 1999 Volvo S80

1 Answer

Our S80 Vovlo, as the vehicle is ruuning, I hear a air leakcoming from the brake patel area, as I touch the patel the noises stop and as I let out the brake patel, the air leake strat again, have any

it sounds like the vacuum pipe to the break servo is leaking or it could be the servo diaphragm broken hence you hear the noise in the car, if the brakes are harder to press its most likely to be the servo unit more than the pipe i would also expect you to having a ideling problem due to the extra air in the intake system. hope this helps regards John

May 15, 2009 | 2001 Volvo S80

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