update with noises but still not sure on one 4x4 system maybe ?

[camcap]

Right the rattle was the cat heat shield and the hissing is the brake servo but still stuck on the noise from the back wheels mainly on full lock more so on right but a little now on left like a rubbing grinding noise slow speed accelerating could this be the 4x4 system ??

[snow_muncher]

More probably a bush

I'd start by looking at the ARB bushes

[camcap]

More probably a bush

I'd start by looking at the ARB bushes

Thanks pal what am I looking for as in wear wise

[snow_muncher]

Basically any of the bushes that look old, dried and cracked.

(fubar front wishbone bush)

The rear arb bushes take a lot of punishment, so good place to start

There are quite a few bushes at the rear of a 4x4, so if the arb bushes are fine you'll have to work from there.

The noise could also be caused by a binding rear brake pad, or possibly even a worn hub.

A bush still be my best bet for where to start.

Have a good poke around and see what's going on

[camcap]

Basically any of the bushes that look old, dried and cracked.

(fubar front wishbone bush)

The rear arb bushes take a lot of punishment, so good place to start

There are quite a few bushes at the rear of a 4x4, so if the arb bushes are fine you'll have to work from there.

The noise could also be caused by a binding rear brake pad, or possibly even a worn hub.

A bush still be my best bet for where to start.

Have a good poke around and see what's going on

Thanks mate your a star

[camcap]

Why is it only making this noise when accelerating with lock on either right or left if you come off the accelerator theft noise stops its driving me mad :(

[dcr]

There are some tests for the Haldex, found these online.

The rolling test shows whether the Haldex is engaging. I have tried it and it is a noticeable difference , worth trying first.

"First run a VAG-COM diagnostic on the AWD system. A bad controller or connection issue will likely show up here

Mechanical Function-test of the Haldex coupling.

- Rollout in circle

Aim: Check the function of the coupling and the response on the car. Is to be done on level ground.

1. Drive in circle with minimum turning radius at a speed of about 10 km/h.

Disengage the clutch and close the throttle.

Let the car roll to full stop.

2. Drive in circle with minimum turning radius at same speed as in case 1.

Disengage the clutch and run up the engine to 3000 - 4000 rpm.

Let the car roll to full stop.

* If the coupling is working the car will stop in about half the distance in case 2 compared with case 1.

* If there is no difference in the two cases there is a malfunction of the coupling. The problem could be caused by the coupling or by missing signals from the car. A further inspection has to be done to be able to determine the cause of the malfunction.

* If a noise from the HLSC is noticed when turning or driving in circles the oil in the coupling is damaged. The damage can be caused by overheating or by water in the oil.

- AWD test on car lift. (all wheels free to turn.)

Aim: Check the function and the control of the coupling.

1. Pull the handbrake.

Disengage the clutch.

Start the engine.

Put the gearbox in 2:nd gear.

Let the engine idle.

Engage the clutch.

* Engine is supposed to stop when the clutch is engaged. (HLSC controlled as in handbrake start.) If engine do not stop, disengage the hand brake immediately. Otherwise there is a risk of seriously damage on the HLSC.

2. Disengage the handbrake.

Disengage the clutch and start the engine

Put the gearbox in 2:nd gear.

Let the engine idle.

Engage the clutch. At least one front wheel and one rear wheel is supposed to turn.

Pull the handbrake for 2 seconds.

* Front wheel is supposed to turn while the rear wheels are supposed to stop when the brake is pulled. Engine is supposed to run all the time. (HLSC controlled as in handbrake turn.) Don't exceed the 2 seconds or repeat the test for more than 5 times during a 5-minute period. Otherwise there is a risk of seriously damage on the HLSC.

Trouble shooting on HLSC

- Visual inspection

Aim: Check for leakage and external damage that affects the function on the HLSC. Is to be done with the car on a car lift.

1. Check for oil-leakage from the coupling. If leakage is found, check oil level at the level screw on the left side of the coupling.

2. Check wires and connecting sockets.

T8 - Socket between car and control unit

T8/1, Red = Ign.

T8/2, Black = Gnd.

T8/3, White = BLS

T8/4, Blue = HBLS

T8/5, Brown = K-line

T8/7, Blue/Grey = CAN low

T8/8, Blue/Orange = CAN high

T2 - Socket between control unit and feeder pump

T2/1, Yellow = Pump 1

T2/2, Yellow/Black = Pump 2

- Signals

Aim: The following signals from the car affect the function of the HLSC. If one or more of the signals is missing or false the function of the HLSC will be reduced.

Bremse 1; BLS, BTS, ABS

Bremse 3; VR, VL, HR, HL

HTH, Dave