Thanks. That's zero for five for my Chilton's manual. It doesn't even mention the boost system. Tim ------- Date: Fri, 04 Jun 2004 14:54:56 -0500 From: Brad Hogg <roadhogg@xxxxxxx> Subject: Re: IML: Hydraulic pump sound ('90 IMP) Reply-To: mailing-list@xxxxxxxxxxxxxxxx >From my experience and understanding of the braking system on these cars, this is completely normal. You are correct, they do not employ engine vacuum for brake boost, rather, there is a pump and a pressure vessel that is kept at sufficient pressure to give you the brake boost you need. Be thankful you hear that pump running, it is when you don't is when you need to start to worry. __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/