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

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:

new remote battery

I wonder if you have an air leak in the brake servo? Check the manifold vacuum as you operate the brakes. Look for bad hoses around brake servo.

Duplicate question

yes your brake light switch is connected to the shifter

Hi if you have a hard pedal, i would suspect you have an air leak on the servo pipe which goes to the brake servo, this is the same pipe that the brake booster is attached to, if you run the car and listen you should be able to hear the air hissing out from somewhere, hope this helps Chris

remove the bits in front of it like the air pipes and the battery and whatever else is in the way ,my favourite vehicles renaults ?? for scrapping not for working on though

Hi admasu

It seems that people when they don't fully understand how things work on renault's disrespect the manufacturer.
I can guarantee there is nothing wrong with your card.

Underneath the clutch pedal there is a clutch switch with two wires connected to it you have an open circuit one of the wires or both are broken.

They need to be soldered back together everything will be okay.
In my opinion it's best not to believe everything that amateur say only speak with professionals.

make sure the connector at the clutch pedal has not been disconnected if thats ok it might be switch on clutch pedal.

Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.