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Model specific boards => Golf mk5 => Topic started by: MK4_20VT on 16 January 2013, 16:26

Title: Brake pedal hissing when pressed after VW service for brake fluid
Post by: MK4_20VT on 16 January 2013, 16:26

Hey guys, my brakes suck now after the full service inc fluid change, i can get the pedal halfway before the car wants to stop & then it keeps going before its stops about 2inch before it can go no further

When the pedal is now pressed, i get a hissing noise

When the engine is off the pedal does go rock solid after a few pumps

Got to take it back tomorrow.  Any thoughts on the cause?

Thanks
Jay

Title: Re: Brake pedal hissing when pressed after VW service for brake fluid
Post by: Chris. on 16 January 2013, 19:19

Needs bleeding again....Air in there somewhere.

Guess if pedal hard when engine off....hold pedal and start engine pedal sinks?

Title: Re: Brake pedal hissing when pressed after VW service for brake fluid
Post by: bacillus on 16 January 2013, 20:01

Sounds to me like the servo vacuum line is leaking somewhere...

Title: Re: Brake pedal hissing when pressed after VW service for brake fluid
Post by: MK4_20VT on 16 January 2013, 20:30

Right, did some more tesing.

If the handbrake is on, the pedal is better
quickly double pump the pedal & it goes back to how it was.  like i can stop, nice & firm

if I apply the brake like you would when slowing down to a set of lights, the pedal just keeps on going down until it stops past half way of the pedals travel, feels like nothing is on the end

Jay

Title: Re: Brake pedal hissing when pressed after VW service for brake fluid
Post by: Wayne on 16 January 2013, 21:08

Servo pipe split or you have air in the system