Free Auto Troubleshooting

Yes you can still drive but the Anti-Lock Brake system is disabled due to the fault. You need the system scanned for fault codes.

Sounds like the vacuum servo is faulty. Atmospheric pressure should only be applied to the back side when the pedal is pressed. Seems like the valve must be leaking? Make sure you have a little free play at the pedal also.

It can be issue with brake system alignment.Get the brake assembly checked.Something is not right and out of its way causing these problem.----------
Click the help links mentioned below and go with the troubleshooting solutions to confirm what is exactly faulty in your case:-----Click the link :----Car shakes like the wheels are going to fall off http://technoanswers.blogspot.com/2012/11/car-shakes-like-wheels-are-going-to.html
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CAR BRAKE PROBLEMS

It can be issue with master cylinder or the problem is there is still some air there in the system,that has to be bleed.Or else the parts replaced are not aligned properly/.I suggest everything back.

There are few help links mentioned below to troubleshoot the issue.

Click the link below and follow its procedure:-----

All types of brake problems and repairs http://howtobyme.blogspot.com/2011/11/abs-and-service-light-comes-on.html

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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html

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Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html

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Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html

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Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html

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Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html

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Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

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Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html

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Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html

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Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html

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Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html

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Fading Sinking Brake pedal?

http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html

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Feels Like Brake pedal Pulsating http://repairhelpcenter.blogspot.in/2012/06/feels-like-brake-pedal-pulsating.html
============These will help.Thanks.

Few latest troubleshooting help links related to these problem.
ABS light stays on but brakes work fine? http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html

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Sometimes ABS light comes on while Driving?

http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html

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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html Fading Sinking Brake pedal? http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html Brakes make Grinding noise? http://repairhelpcenter.blogspot.in/2012/06/toyota-corolla-brakes-make-grinding.html

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These will help.
thanks.

auto hold helps to prevent rool back on hills, it is not somethreing you need to operate, it is completely automatic.

The Auto Hold function in Volkswagen's new Passat and Passat Estate is an extension of the electronic parking brake. The Auto Hold function prevents the vehicle from rolling away accidentally when standing still or when setting off. In this way Auto Hold offers the ultimate in convenience and comfort when driving or setting off, along with enhanced safety. The system is operated via the ABS/ESP hydraulic unit. When the vehicle is braked to a standstill, Auto Hold retains the last-applied braking pressure. The driver can take his/her foot from the brake pedal and all four wheel brakes will remain on. If the ABS wheel speed sensors detect any rolling, the braking force is automatically increased until the vehicle comes to a standstill again. This may be the case if, for example, the driver brakes gently to a stop on an incline. As soon as the driver presses the accelerator again and, in the case of manual gearboxes, releases the clutch, Auto Hold reduces the braking pressure once more. For safety reasons the function always has to be reactivated by means of a button to the left of the gear lever when the engine has been switched off.
Source: http://www.volkswagen.com/vwcms/master_public/virtualmaster/en2/experience/innovation/technical_glossary/auto_hold_function.index.html

Two possibilities. One is a leak, inspect all 4 wheels completely, and then inspect ALL brake lines and hoses. If all is okay, replace the master cylinder. Pre bleed the m/c.

This could be a few other things: try these: (have a diagnostics test done at a local auto parts dealer or mechanic (auto parts dealer will usually do it for free and only takes abotu 10 mintes).

1. O2 sensor(s) : replace

2. temperature gauge sensor

3. oil pressure sensor (regulator)

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

ur truck is in [safe] limp mode to protect itself from damage problem can be from oil pressure issue to brake to tranny problem need to have the trouble light scanned [diagnosed] most auto stores such as auto zone/advanced auto check ur local area offer this scan for free the code will help diagnose ur problem so a repair can be made

check the brake lights and make sure they work, you may have a burnt out bulb.