master brake cylinder failing

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
2015 sel tdi 31k
When starting in morning after sitting overnight vacuum leak causes brake pedal to be hard, some effort required to close safety switch to engage start, after start, pedal will bleed down close to floor in 30 seconds. At stops it bleeds down at about same rate. Dealer states this is normal for diesels, although my 60k 2013 tdi sel showed none of these symptoms. Except for the source of vacuum, pump vs manifold, I would doubt that Passat gasser has a different master vac/master cyl than the tdi version. My experience is that the m/c is leaking internally as no fluid appears in the master vac or any other place and fluid level remains at same level. It would fail Pa inspection. I just want to get it replaced before the warranty is up in 4k miles so I don't get boned. Any one else experience this?
 

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
part number for passat m/c tdi has been superceded to a new number. Mine is getting changed next monday. we'll see if they fix the vacuum leak as well.
 

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
I most certainly will post the new part# as soon as I have it. I might just get it today and post.
 

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
new master cyl part# for 2015 passat tdi: 1K1614019AG
Vacuum check valve booster/tubing assembly is currently back ordered.
 

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
M/c replaced, no more pedal bleed down but vacuum check valve for booster still bo.
 

740GLE

Top Post Dawg
Joined
Aug 19, 2009
Location
NH
TDI
2015 Passat SEL, 2017 Alltrack SE; BB 2010 Sedan Man; 2012 Passat,
Does the pedal go to the floor at red lights? to me that would be the nail in the coffin a new MC was needed.

vacuum leaks are tricky to track down.
 

thundershorts

Top Post Dawg
Joined
Jul 15, 2010
Location
west chester pa
TDI
2015 passat tdi sel premium 2015 golf s tdi gls tdi b5.5, 2002 eurovan,Peugeot 505 td,Citroen cx25 prestige
bo=back order, sorry. the check valve for the master vac most likely would account for the vacuum leak overnight and they are still on bo.
 
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