Question about 2001 Volkswagen Passat

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Vw passat tdi 2001 4dr

Brake servo appears to run out of pressure when brakes applied firmly

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  • hijamie Apr 01, 2009

    2002 Passat sport 1.9TDI brake pedal goes soft and could be pressed into floor on first pump, on second pump pedal goes hard, no braking power, servo not working. could it be the pump or servo. No appearent leaks at wheels.

  • yadayada
    yadayada May 11, 2010

    It is not pressure it is vacuum isn't it?

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You should have a servo pump to help the pressure on diesel models. If the pump fails, then the brakes feel soft as though there is no pressure there. The other fault is, that a wheel cylinder or some other brake componant is leeking fluid. Cheek for fluid leeks and if there are none get the pump checked out.

Posted on Nov 28, 2008

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On my 2004 Jetta 1,8T the brakes are starting to get hard. Taking s little more pressure on the brake pedal to stop the car. What could be causing this??? Thanks


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The problem will be with the brake servo assist. It is possible there is a leak in the brake servo assist system, which reduces the vacuum, so you are not getting sufficient mechanical assistance when applying the brakes.

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VW did a recall on some earlier year models for a leaking brake servo and I understand the problem was a faulty vacuum hose which would fail and leak. I am not aware of any recall for this item on later models like your 2004 vehicle.

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check for vacuum pump operation - remove pipe at vac pump and check for sucking on end of finger, check pipework to brake servo unit for chafage / disconnection. if no vacuum at pump replace the pump ive had a few like this

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Occasionally when I apply the brakes on my 2001 VW Passat it sounds like the ABS is kicking in even when I am soft braking. The brake pedal vibrates and the car makes a grinding sound. What could be...


I had exactly the same problem with my 2003 tdi, 'scary stuff for sure' Lots of so called experts knew what the problem was, (brake pressure switch).. (ABS sensor at the wheels) .. (ABS control module)..Trial and error and lots of expence for sure, no thanks, keep away from from the backstreet cowboys and go to the people who specialise in VW repairs every day and who know what they are talking about. My main VW dealer sorted it, they found it was a problem with the YAW Sensor located under the rear seat, they cleaned it and checked it and reset it etc, they didn't even charge me ( I did have a new clutch and 2 outer CV joints fitted at the time) and now it seems ok, hasn't happened since, actually this seemed to happen more often when I had 2 or 3 people sitting in the back seat and the ESP light came on at the same time, hope you sort it soon

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Stalls or wants to turn off when pushing brakes


Check for vacuum leak within power brake servo unit.
Remove vacuum hose from brake servo and block off the open vacuum line from the engine. Check that engine then runs normally when brakes applied.
Do not drive the vehicle with the vacuum servo disconnected, as the brakes may not be effective. - The pedal pressure required to apply the brakes effectively may exceed your capabilities.

If the brake booster servo diaphragm is leaking it will need to be replaced/repaired.

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