Caliper on front brakes rattle on 2008 A6 (C6) Avant S-line

[Alfie6]

Hi - I have recent acquired a 2008 A6 (C6)avant sline and I am experiencing rattle from the front brakes driving over rough road surfaces. I note the car has recently had new discs and pads and only 10% worn. I have renewed the caliper springs on both sides and this has largely improved the problem but annoyingly there still some rattle from both sides. Being a sline with harder suspension is this a common problem on these cars on our bad roads. Further my local  garage has inspected the suspension and can only find that anti-roll bushes may required to be replaced in the distance future, and could only be an advisory on the MOT, but offer no more advice. Anybody had the same problem and solved it?

[Alfie6]

Hi, its Alfie 6 again, and I now intend to inspect the front calipers. Before I do so I would be pleased if anybody could direct me to an explosive diagram of the caliper unit.  Having worked on previous calipers, there appears to be a lack of support for the pads, having only the outside spring to stop rattle of the outer, and the cone one which goes into the piston?  Please note that my car is an 2008, which is different from the later models, which has an over lapping external spring. Any help would be much appreciated.

[cliffcoggin]

Stripping the calipers is a good idea, but I can't help with personal experience or diagrams.

[spartacus 68]

What make are the pads and rotor? Is there excessive corrosion on the brake carrier so it’s lost shape.

Have a look at diagrams here and cross-check on your engine code. https://www.lllparts.co.uk/catalogs/audi/RDW/A6/448/6

For brake sliders, pad shoulders and piston face use a little ceramic brake grease. The brake carrier bolts should be okay to undo if you’ve new hardware. These bolts tend to seize if left untouched for periods of time.

Edited 5 hours ago by spartacus 68