Cv joint

It's annoying this one, just one of they ones that makes me feel like a tit when it's knocking all over the car park and I know what's wrong with and I can't fail it😡😡😡 but if it was a burst cv boot and knocking I could only advise a customer who's tight as anything saying it's failed on cv boot but not on cv joint as no wear when jacked up, advise it and tight customer just replaces the boot with a stretchy one and the car drives out the car park knocking it's head off with a brand-new mot certificate🤔🤔 I've never seen a cv joint badly worn by checking it when jacked

I have no doubt that I would shout that as a fail even if I had missed it when the car was on the ramp .

I do agree that it is not always possible to detect an excessively worn CV end when checking them on the ramp.

If it is clicking and it is obviously coming from the CV end and I haven't already entered my test results then this would sway my opinion, it would be the same if I noticed the clicking coming from an excessively CV end whilst driving it into the MOT bay.

If the vehicle presented for retest having only greased the bearings within and I could no longer detect the Fault aurally then I would issue a pass otherwise I will consider that clicking sound as excessive wear needing a replacement joint.
I don't always have the opertunity to drive a vehicle under test into or out of the test bay and have been known to cringe when a car with a clicking joint pulls away from me after receiving a pass. But then if you can't detect it you can't fail it.
my test decision in this situation is based on an aural assessment 
I do not charge for retests 

You can't fail a CV joint simply because it clicks as you drive around in circles. That's not in the MoI. Even if it was you still shouldn't be failing it IMO. Yes it's worn but how do you know it's excessive (MOT standards here)? Just like inner track rods,you can't fail what you can't see. I've yet to fail a CV joint for excessive wear and I doubt I ever will.

These two posts sum it up nicely.

Similar to, let's say, an ABS warning light that only comes on when driving. You're testing the ABS light in your authorised test bay and not out on the road. Even if you're doing a deaccelerometer test and the ABS light comes on it isn't technically a fail as a test drive is outside the scope of the MoI.

This is madness again NT going there own way . and making up the rules as they see fit.

I'm sure we've all had examples outside of the mot. Where assessing cv joints on full lock. you suspect noise is from say the near side. However after replacement you find both outers are noisy

I would not sweat over an appeal should anyone be of the opinion that a clicking CV end is not by the sound it is making being deemed excessive and either needing service or replacement, the road test option is there for us to use if we consider it necessary to form an opinion.
We are permitted also to use our ears to make assessment, not only our eyes and hands.

ABS lights illuminating when out on a road test is another interesting topic and perhaps deserves its own topic heading to promote discussion on what the testers should do, Oh I miss the refreshers when you could discuss this face to face with a Trained instructor and other NTs on the course.

It may be worn, but we should not be using service standards to issue an MOT fail, which is what I believe that decision to be. How much wear do you need to make it click or knock? How much wear constitutes a need for replacement? How much wear can you measure in testing the joint for MOT? Pass and advise.

With the steered wheels clear of the ground, rotate each wheel in turn and LISTEN for any sound indicating roughness in the bearing.

www.mot-testing.service.gov.uk/documents/manuals/m4s02000502.htm

A road test is used to assess something that is " likely " to  adversely affect the steering or braking of a vehicle.

A failure of a CV end could be likely to affect either steering or braking. 

The bearings are rough when rotated.

You say Class excessively worn as resulting in a CV Joint being insecure, That confuses me without further explanation.

excessively worn and insecure are separate definitions.

No one has ever questioned my decision to fail their vehicle for a CV end that has been making these noises.

my Quality controller shares my view on this subject and I would invite the view of the DVSA on this as I seem to be in the minority on this topic on this forum 🤔
But I'm yet to be convinced by you all. 😍 Be gentle with me and perhaps define what you consider to be excessively worn that hasn't already broke.