david295 Posted May 31, 2012 Share Posted May 31, 2012 My car has now started to almost stall when i press brake, i can hear a hissing noise coming from around the brake servo under bonnet. Does this mean it knackered. Quote Link to comment Share on other sites More sharing options...
ChrisH Posted May 31, 2012 Share Posted May 31, 2012 It could be the diaphrams bust, but just make sure that there are no leaky vacuum hoses first, particularly ones connected to the engine... Quote Link to comment Share on other sites More sharing options...
david295 Posted May 31, 2012 Author Share Posted May 31, 2012 its now started to almost stall when its on tick over and i switch heater on Quote Link to comment Share on other sites More sharing options...
artscot79 Posted May 31, 2012 Share Posted May 31, 2012 battery either a faulty cell or the wrong type of battery ie not silver calcium do the dash test and check battery voltage Quote Link to comment Share on other sites More sharing options...
ChrisH Posted May 31, 2012 Share Posted May 31, 2012 I would be inclined to agree. Dont rule out a faulty alternator, or drive belt as well. Im saying that, as braking reduces engine speed, and revs, and therefore alternator spin. If you hear the hissing inside the car, this is normal for servos, just make sure pedal hardens up after engine turned off, and pedel pumped a few times Quote Link to comment Share on other sites More sharing options...
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