air noise from brake pedal

[mctwistuk]

I have never had this on any other car I have owned so not sure if it is normal. When you pump the brake pedal when not moving there is air released from it. Any car I have had just gets to a point where you can't press the pedal any further. The brembos on my scoob didn't release air like this. Is this normal?
chris

 

[Foxspeed]

that will be the servo you can hear letting air in to provide brake "boost"

its a 2 chambers - one side has a vacuum applied (form the engine) the other as you press lets atmopheric pressure in this difference provides a boost to the force you apply to the brakes

some cars servos are noisier than others and some dont use servos as they use fully powered brakes

to test it - without the engine running press the pedal several times until the brake pedal goes hard - keep the pedal pressed and start the engine - you should then feel the pedal "sink down" slightly - this shows the servo doing its job :thumbup1:

 

[Adrian]

top technical knowledge again Simon