Brake Pedal Hissing

[mark1rev]

i have a 2.3 the brake pedle has just started hissing is it anything to worry about

or is it normal for a galaxy ? :(

[Masked Marauder]

When does it hiss? All the time?

 

If you stop the engine and go back in a half an hour is the pedal stiff?

 

If the engine is off and you pump the pedal until it goes stiff, hold it down and start the engine does the pedal drop further?

[Guest andypenn]

HI

Is the cruise control somthing to do with this split hose on the brake pedal switch?, I know when I had a Range Rover the brake pedal had a vacuum feed to release the cruise vacuum when pressed.

 

Andy

[mark1rev]

yes i left it for 1 hour and it was hard -ish then pumped the brake and started car with foot on brake and it went down

[mark1rev]

it doesnt have cruise control

[Guest andypenn]

HI

Oh well I tried :( :( :o

[GSMGuy]

The hiss is normal, if it's happening as you release the pedal, it's merely the vacuum release valve, which the pedal rod passes through, relesing the vacuum, and letting fresh air in from inside the cabin, so at to allow the diaphram inside the servo to return to it's neutral state.

 

If it's gotten noiseier recently, it could well be that the sponge air filter, or the rubber boot covering it (again around the pedal rod) has deteriorated of fallen off! I wouldn't woory about it, as operation sound normal enough.

 

Mike

[mark1rev]

thanks i wont worry to much now :(

[mark1rev]

even if im not driving and just parked with foot of brake its doing it ?

[Masked Marauder]

It sounds like a leak on the pedal side of the vacuum servo to me. This is confirmed by the loss of vacuum when left with the engine off.

 

Otherwise it is working fine, but it is likely to get worse.

[GSMGuy]

As MM says, if it's happening all the time, there is defo a problem, and it'll be vacuum/servo related..

 

Mike