Hi I've noticed recently that when I brake hard , on pulling away after I get a knock or clunk from the rear left hand side . I've had a look around for loose items in the boot and any play I links etc but nothing obvious . Any ideas as to possible causes . It's a 2004 s type r . Also just had new shocks and springs

Thanks

 

The $64,000 Question:

Were you getting the same noise with the old shocks and springs?

 

I was having all sorts of knocks and clunk's before the change so could of been. It only seems to be when I pull away after a sharp brake .

 

How about this? With the engine at idle, car stopped, keep your foot on the brake. Shift back and forth between R and D a few times. If you now hear a metallic clang, you've probably got a bad U-joint. Do this test while stationary to help rule out the suspension.

 

thanks for that , I've tried that and seems OK so that's one thing ticked off the list

 

Not sure what to suggest next. Maybe jack up that corner and give the wheel a good shake. If good, remove the wheel and give everything a good visual inspection.

Suspension noises can be tricky to diagnose. When you unload the suspension like that, the geometry changes, the spring and shock go full extension, etc. You're not really able to duplicate the fault conditions, such as weight on wheels, applying torque, etc. Sometimes the best you can do is look for evidence of worn parts, such as dusty residue from a rubber bushing, and things like that.

One other thought: What are your repair capabilities if you do find a problem, such as a failed bushing? Depending on exactly what has failed, you may need a spring compressor, big impact gun, etc. It's free to look things over, but keep in mind you may still end up having to take the car to a shop anyways.

 

I think I may have found the problem , I seem to have movement in the rear stabiliser bar on that side . I have been looking at prices for the part and I'm wondering what to go for ? Genuine jaguar parts , lemforder or TRW the jaguar parts are very expensive but the other 2 are a bit less . I'm thinking I need to do the pair like you would drop links or roll bar bushings .

 

I believe that Lemfoerder is the Jaguar OEM for these components. TRW has historically been a supplier of good quality auto parts for the industry. You are most likely fine with either one, but personally I would go with Lemfoerder...

 

Charles,

That noise sounds so regular and consistent and speed-related that I'd be minded to start with Greg's suggestion of prop joint or drive-shaft joint knocking on something on rotation.

Good luck

Paul

 

Well after a lot of investigation I've finally found the culprit. I had initially dismissed this as being the issue as I had not long replaced the rear lower arm but it turns out to be the 2 smaller bushings in the arm . The part I had used was a refurbished part so lesson learnt only use the original or lemforder (zf ) parts . But all sorted now so thanks for the advice guys