E30 Zone

Hi folks

The car seems to have developed a hissing sound when pressing the brake pedal.

When switched off the pedal seems hard and with engine on the hissing comes from the glovebox area every time the brake pedal is pressed. Braking seems a little less effective than before (car has uprated discs at the front / drums at rear). Fluid level is spot on.

So, could it be a vacuum leak or is it likely to be a wallet buster?

Cheers

There is a vacum pipe (on my 325i at least) that runs from the brake servo to the throttle body. I would check there for a split.

Hopefully they are OK as from the dealer if its the two pipes setup that goes into the TB then they are over a £100 for a replacement.

http://www.e30zone.net/modules.php?name ... ght=whoosh

and

http://www.e30zone.net/modules.php?name ... ght=whoosh

You're problem was incorrectly identifying the sound as a hiss, when it is infact a whoosh!

Happy to help ;)

Also, for the brakes seeming a bit less effective, this could either be in your head which is perfectly reasonable when you start hearing noises, or something else but I'm not experienced enough there to advise.

Yes indeed, a whoosh

So, seems like I can ignore it, well for the short term anyway.

I will check the pipes though just in case. Just broke a 318, could have used the bits from that if possible but it's gone now. Damn!

Thanks fellas