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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old April 5th, 2019, 14:50   #1
thundershorts
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Default master brake cylinder failing

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?
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Old April 5th, 2019, 15:27   #2
tdiatlast
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A quick advanced search found this...

http://forums.tdiclub.com/showthread...ff+brake+pedal

There are other threads discussing your symptoms.
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Old April 8th, 2019, 15:32   #3
thundershorts
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part number for passat m/c tdi has been superceded to a new number.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.
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Old April 9th, 2019, 05:07   #4
roni024
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Will you please post the new part number when you receive your invoice?
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Old April 10th, 2019, 04:32   #5
thundershorts
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I most certainly will post the new part# as soon as I have it. I might just get it today and post.
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Old April 10th, 2019, 07:05   #6
thundershorts
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new master cyl part# for 2015 passat tdi: 1K1614019AG
Vacuum check valve booster/tubing assembly is currently back ordered.
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Old April 17th, 2019, 14:42   #7
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M/c replaced, no more pedal bleed down but vacuum check valve for booster still bo.
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Old April 18th, 2019, 04:39   #8
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thundershorts: Thank you for your continual updates. What's "bo" mean?
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Old April 18th, 2019, 11:46   #9
740GLE
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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.
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Old April 18th, 2019, 16:52   #10
thundershorts
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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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Old April 19th, 2019, 05:59   #11
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Doh! I should've inferred that from your previous post...
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