Megane 2008 - Pas front brake hissing after disc/pad replacement | Technical matters | Back Room Forum

What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks

Thu 27 Sep 2018 22:38

Megane 2008 - Pas front brake hissing after disc/pad replacement - Monkaymagic

Hi,

Had someone to replace pads and discs all around today. Have noticed when the ignition is on and I press the brake pedal that there is a noise which sounds exactly like a bicycle pump coming from the passenger side front footwell. Only happens when I press the brake down. Not hvingg an idea about cars....any ideas?

Reply | Report as offensive | Link

Thu 27 Sep 2018 23:50

Megane 2008 - Pas front brake hissing after disc/pad replacement - bathtub tom

I'd suggest it's the vacuum from your brake servo. Does it stop after you press the brake pedal several times? If so it means you've emptied the vacuum reservoir and the pedal then becomes very hard. If you then re-start the engine, does the brake pedal become softer?

Reply | Report as offensive | Link

Fri 28 Sep 2018 03:07

Megane 2008 - Pas front brake hissing after disc/pad replacement - Monkaymagic

Hi,

Yes the hissing stops after I press the pedal several times when the car is stopped andas you say the pedal becomes very firm. Then when I re-start the car the pedal goes down an inch or so andbecomes softer.

Should add that's it's not a continual hiss ....with the brake pedal pressed down it lasts a couple of seconds and then stops. I then release the brake pedal and press it again and it happens again for a few seconds.....no problem with it yesterday discs and pads changed todayand problem occurred

Edited by Monkaymagic on 28/09/2018 at 03:12

Reply | Report as offensive | Link

Fri 28 Sep 2018 12:26

Megane 2008 - Pas front brake hissing after disc/pad replacement - John F