Hi All,

I have a 2010 Skoda Octavia 1.6 tdi. Recently I noticed when I depress the brake pedal before coming to a stop it sounds like there is some air escaping from the pedal. The brake pads were replaced about 45,000 km ago and the brake itself is working fine.

When I turn off the car the brake pedal goes hard which is normal.

Any ideas?

All sounds normal to me!

Your brakes are hydraulic so no air unless your in a truck, maybe its just crud on the disc surfaces you can hear

It could be the seal that the brake pedal rod goes though in the servo.

Maybe not air escaping but air being sucked into servo. Does the brake go hard after you press it a few times or does it do it after the hissing stops but not pressing the pedal?

Ian

If there was air getting in or out of the brakes system, you would know about it with a spongy peddle and eventually no brakes at all.

Brakes will be hard when ignition is off. If you have to pump them when driving to get a decent peddle and brake effect then you have got a leak somewhere

I had that on my car as well, took it to the dealer and turned out the brake servo was leaking.

@Countryboy/Ian

Yes, it does go hard when I press it a few times. I guess since the pedal goes hard after pressing it a few times the servo is working ok?

Since yesterday I can hear a different sound (it is not really metallic to be honest but more like something rubbing together) when pressing the brakes coming from the rear, thus I think maybe it is just the rear pads that need replacing. I took it to a garage and they said it is probably the back pads which are worn down causing more sponginess.

Does sound like a leaking servo (it's vacuum operated). I'd be suprised if worn pads caused sponginess - shrieking, yes, when they hit the metal backing plates.

Does sound like a leaking servo (it's vacuum operated). I'd be suprised if worn pads caused sponginess - shrieking, yes, when they hit the metal backing plates.

Does the fact that the brakes go hard after pumping them a few times when the car is in neutral indicate that it mightn't be the servo?Took it to a garage yesterday and they claimed the brakes are fine besides worn rears pad, however I do think the car feels and sounds differently. I will replace the rear pads and let you guys know if it makes any difference. If it doesn't work I shall take it to the main dealer (the main dealer was booked out until after Christmas unfortunately).

Got back pads replaced and seems to have sorted the problem! Thanks for all of the responses.