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Audi a4 2001 b6 has been replaced brake vacuum pump as it was so hard event got new part still very hard to brake and very little breaking

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Check for proper vacuum,could be just bad check valve

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

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SOURCE: 1993 f250 7.3 diesel - hard pedal, hard to stop,

Change the master cylinder on your booster. had the same problem with early 90's ford ranger. The pistons inside the master cylinder are probably worn...... Make sure to bench bleed the new master cylinder....

Posted on May 19, 2009

shadtremonky
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SOURCE: Brake problems on 1988 Chevy 1500

soft lines may be bad

Posted on Jun 20, 2009

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SOURCE: bleeding a4 (b6)cooling system?

bleeder screw on metal water pipe above inlet manifold. loosen bleeder screw, fill coolant at coolant resivoir untill all air pushed out bleeder.

Posted on May 12, 2010

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SOURCE: water pump impeller query

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All impeller blades are made of plastic. This way they will keep a tight fit on the inside of the water pump. Metal would not be able to do this.

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Posted on Jul 05, 2010

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SOURCE: 96 ford taurus breaks are hard but no breaks

I agree with carl, about the vacume hose to the booster.
I think that i would also recheck the rear brakes for binding,and proper installation.
I hope you find the problem, best wishes !

Posted on Nov 22, 2011

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1 Answer

How do you change the water pump in an Audi A4 2.0 B6


The link to the timing belt video will give you all the info you need to replace the timing belt driven water pump. How to properly replace the timing belt on Audi A4

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Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

Jul 09, 2014 | 2000 Isuzu Rodeo

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Hi: I have a 1991 F350 diesel IDI dually; I just had work done on the back breaks because the back breaks locked up on it. New breaks, new drums, and new bearings. Now when trying to stop when going...


Hi sounds like your front rotors are warped. Do you feel it on one side or both? Your brake booster may not working properly or doesn't get enough vacuum. That make the brakes drag a little bit and in a long run will make the rotor warpe. Check front callipers if they not seized first , mesure vacuum. If it's ok you have to replace front rotors and pads

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Breaks wont pump up no air in line.will pump up when car is not running.start it and hardly no pedal


SOUND LIKE POWER BRAKE BOOSTER FAILURE.CHECK TO SEE IF VACUUM GOING TO POWER BRAKE BOOSTER.IF NO YOU HAVE BROKEN OR DISCONNECTED VACUUM LINE TO BRAKE BOOSTER.IF POWER BRAKE BOOSTER GETTING VACUUM MORE LIKELY BRAKE BOOSTER HAS A LEAKING DIAPHRAM.

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The brake pedal pedal on my car is hard as a rock and i have little breaking power. already tried to bleed the breaks and it did nothing.


booster unit has failed or not getting vacuum from engine. Check vacuum line from intake to booster unit. If vacuum is good, diaphram may have failed inside the booster.

Aug 23, 2010 | 2005 Dodge SRT-4

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Speedo cruise on the audi 100 does not work


The cable was probably not reattached to the throttle body, or the wiring for the cruise module was not plugged back in. The VW/Audi cruise control system does not use engine vacuum, it uses it's own vacuum pump. Vacuum runs from the pump/control module to the vacuum reservoir that pulls on the throttle cable. The is also another vacuum line that runs to the brake pedal, which is a safety feature (press the brake pedal and the vacuum to the vacuum reservoir is instantly cut, releasing the throttle and disengaging the cruise control.)

Jul 15, 2009 | 1993 Audi 100

1 Answer

I need to replace the rear brakes and rotors on my 2004 Audi A4. Will I need special tools to do this? Can I still do the job without these tools?


'B6' (2001-2004) A4s dont have seperate rotors on the rear brakes like the pre 2001 A4s do. When changing the rear pads + discs the only special tool you will need is a caliper wind back tool. Let me know if you do also need to replace any ABS components aswell as I might be able to advise.

Apr 21, 2009 | 2002 Audi A4

1 Answer

2001 Audi S4 ABS engagement, electronic buzz and shudder


Your car, like mine, has suffered the usual ABS pump electronics failure.

I have an almost identical car.

There are some great threads on the net on repairing them, however the wires inside it are just shockingly small, hair sized, and not a job for even the best "DIY" solderer.

Replace the electronics module on the side of the ABS pump, it doesn't need the brake pipes loosening or anything. It is easy to swap.

Then your ABS will work as it should.

You will NEED to find a used unit, or have yours repaired though, new ones are rediculously expensive.

Great Car though.

Mar 06, 2009 | 2001 Audi S4

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