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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old February 14th, 2019, 20:01   #1
Join Date: Nov 2018
Location: Marysville wa
TDI(s): B4 passat
Default Stiff brake pedal but not a lot of brake force

So from my findings on here it looks like I could potentially need a new diagram or need to replace the vacuum line that comes from the brake booster. Does anyone have anyway to trouble shoot before I buy the parts. Just wanna get the old girl back on the road
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Old February 15th, 2019, 15:38   #2
Veteran Member
Join Date: Nov 2015
Location: phila area
Fuel Economy: mk3 ~43mpg

a couple of things you can check first.
1: you need two vacuum nipple blocks/plugs. i think its the same size/thing as the injector over-flow plug used on the one side.
take off both small vacuum lines off the nipples right near the vac pump. plug these. now check if you have brakes. if so you ve found where the problem is.
several more things. to check a hard line, inspect for breakage, look closely with a light. esp look at the booster connection. here move line some, not too much, see if its broke there.
it can be the master cyl o-ring, or a rusted out booster. an engine listening device, like a stethoscope can hear air rushing. (for any leak, including the hard vac line).
small fleet of mk3 tdi
have exp on mk1&2, idi
other vw interests
iluvmydiesels is offline   Reply With Quote
Old February 21st, 2019, 18:39   #3
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Ol'Rattler's Avatar
Join Date: Jul 2007
Location: PNA

To troubleshoot vacuum issues, get one of these. Without one, you are mostly wasting your time.

2006 Jetta TDI
5 speed, Manufactured 06/06
DC stage 1 SMF Clutch
Draw-Tite hitch
Dash Tray
Blue tint aspherical mirrors
Euro Cupholder
Euro Light Switch
2nd grocery hook
VCDS Hacks: DRL Disabled-Seatbelt Chime Disabled-Key fob Power Windows
Adjusted Cam to Crank Timing

Last edited by Ol'Rattler; February 21st, 2019 at 18:44.
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