How do you change anti roll bar bushes on an audi a3 . do you have to drop the subframe,or can you just lossen the bolts.

Frank, you haven't said what make or model your car is.
However, have a look on the following link - it will take you to Youtube:
how to replace anti roll bar bushes Google Search

It's not a particularly difficult job. It entails loosening the drop-links/tie bars that connect to the torsion bar - the anti roll bar, then loosening the bolts holding the anti roll bar in place.

Just be aware that the anti roll bar is in effect a 'spring' and is under tension. Loosen the retaining bolts gradually, slowly.

replacing the bushes is straight forward. Once you have removed the anti roll bar just lever the old rubber bushes out with a screwdriver and push the new ones into place .. then reassemble everything.

In the most general of terms you would do the job in a couple of hours

check the rear links
anti roll bar buses is held by one or two bolt
undo the bolt and put new bush in and do the bolts up..

but have a pry bar with you as new buses need to be pushed in for fastening the bolts

anti-roll bar bushes, could be the problem get a big screw driver and lever the anti roll bar see if you have movement

Yes anti roll bar bushes or shock absorbers are quite common

Definitely get the anti roll bar bushes seen to, its such a front heavy car. The sleeves are plastic and crack away, leaving metal on metal. Also the wishbone bushes dry out and will need replacing(most likely source of the creaking). Probably a 2-3 hour job for a decent mechanic, plus parts, you would have to get a price as it is so variable, but I remember buying anti roll bar bushes and drop links from a dealer for less than £50 all in.

In my opinion, removing the front subframe makes this job much easier.

Jack up and suitably support the front of the car so it is in a wheels free state.
With wheels removed;

• Remove the anti-roll bar drop links from the anti-roll bar
  
• Free off the lower arm ball joints off
  
• Remove the track rod ends from the swivel hubs
  
• Remove the nut and bolt and special clip on the lower steering column universal joint
• loosen off and disconnect the feed and return pipes to the power ram (beware stinking power steering fluid pouring everywhere!)

Steering and suspension wise, the subframe should be free!

• Remove the nut and bolt that secures the lower engine mounting to its bracket (the bolt that goes through the big round rubber mount at the back of the engine)
• Disconnect all relevant gear linkage rods (this will be clear when you are under there!)
• Support the subframe with a jack or somesuch and free off the 6, 18mm bolts that secure the subframe to the body shell.
• remove all subframe mounting bolts.
• lower the jack that is supporting the subframe, it should all drop quite nicely and then get stuck on the steering column universal joint! A good old college shove frees this and then you should be able to remove your subframe assembly from under the car.

anti roll bushes are lockated with the arms, that hold your wheels together, if you are not sure get someone to point it out to you, unless you have did them before you may run into a hrd time with it

I am assuming you mean the rear ones! you neeed to jack up and support the car, as you will be moving the rear subframe support the car on the forward end of the large arms that go to the floor (it is allways solid there) depending on the make and condition of the exhaust you might get away without disconnecting too much of it. support the subframe centrally with a jack, unbolt the 4 nuts and bolts that hold the mount to the subframe, lower the subframe enough to unbolt and change the rubber mounts, if the exhaust or brake flexy stop it dropping enough to change the mounts disconnect them, refit and tighten.

Check the anti-roll bar bushes and also the end stops of the anti-roll bar

hi, is this front or rear anti-rollbar? Front ones are a right pain, you have to drop the front subframe for access. If you don't have a wheelfree ramp then it's not a job for the faint hearted! You also need to disconnect the steering column to allow the subframe to drop far enough to get at the bolts that secure the collars over the bushes. Before you disconnect the steering column, point the wheels straight ahead and remove the key so that the steering lock stops the steering wheel turning, this is to prevent damage to the contact reel for the air bag, which can be damaged if the steering is turned too far beyond normal rotation!