car revving when the brake is pressed?

[Rich-VT]

it's on a 16v megane but i thought its worth a try


a guy round the corner seen me workin on my car and asked if i knew about anythin like that.


happens when the car is stationary, press the brake and it revs its self

 

[ben_r1]

Something to do with the brake servo, only thing that connects brakes to engine.

Maybe a vacuum leak from the servo pipe allowing the engine additional air after the throttle butterfly???

 

[jesus]

Do you have big feet?

 

[Rich-VT]

Do you have big feet?

lol


not me mate its a fella round the corner

 

[ben_r1]

Do the good old servo test,

Pump pedal hard with engine off til it goes stiff then hold it down, as you start the engine it should sink a couple inches, then switch it off and pump and should go stiff again.

If the above dont happen then could be your problem

 

[ripp]

this happens with mine also but only while moving (like slowing down to a traffic light and while in neutral)
brakes seem to lack the initial bite (discs and pads are one good-ds 2500+ brembo HC combo) could these two issues be related?

 

[Russ_16v]

Revs rising a little when pumping the brake pedal is normal

 

[Filippo]

Do you have big feet?

Haha. Quality. I had a Fiesta years ago and the revs used to die every time you put the clutch to the floor. This resulted in me having to press the clutch, brake and tickle the throttle every time I rolled up to a junction, all simultaneously.

Sheer panic every time I slowed down!

 

[ripp]

Revs rising a little when pumping the brake pedal is normal

the revs go up to ~ 1500 rpm, so this is more than a little I guess, plus, it didn't used to be like that

 

[Quinnie]

Mine started to do this after i had an RS2 fitted. I just put it down to that. However it does only do it for the first minute of a journey.

If it does it all the time then thats pretty awesome, its like having auto heel toe!!

 

[bmh.01]

Be servo related I imagine. Its not awesome in the slightest, its a fault. :dapprove:

 

[Quinnie]

Oh, sorry. I take it my lack of some type of "smiley" didnt put across that that was a joke.
Auto heel toe, ha!