Mot Due

[TimR]

...but that’s what it’s designed to do!
I just tell them to use a Tapley rather than lock a wheel if they struggle to get a reading..
Better than someone else driving my car...if they don’t have to.
Each to their own Iguess....

 

[Zep]

It’s designed to limit the slip using friction. The clutch plates are just metal discs with some grit glued to them, once the grit is gone it’s just metal and oil, so slip increases.

Anyway, if they use the rollers and don’t brake them independently that would also do it.

The MOT man driving my car at 5 mph round the car park is fine for me, I understand it might not be for some.

 

[TimR]

It’s designed to limit the slip using friction. The clutch plates are just metal discs with some grit glued to them, once the grit is gone it’s just metal and oil, so slip increases.

Anyway, if they use the rollers and don’t brake them independently that would also do it.

The MOT man driving my car at 5 mph round the car park is fine for me, I understand it might not be for some.

Okay...
That’s right though. They probably aren’t likely to actually lock a wheel as the reading isn’t so demanding that it’d be necessary. (RPMs are very low but torque is potentially very high )
I must admit, I thought the friction plates were essentially like those in a wet clutch motorcycle engine ( sintered something ).
Unless your brakes are iffy, I’d be confident that a simple drum tester would yield a result first time...
Forewarned is forearmed...

 

[Ebenezer]

It is the turning the wheels independently that does the damage. As it is a plate type LSD, turning the wheels independently will always wear the friction material on the plates. So for me it’s a no brainer, don’t take the risk.

While I don't think it has been conclusively proven, there have been a number of posts from people who have reported problems with their diffs post MOT. As Zep says, best to avoid the possibility.
Eb

 

[philw696]

...but that’s what it’s designed to do!
I just tell them to use a Tapley rather than lock a wheel if they struggle to get a reading..
Better than someone else driving my car...if they don’t have to.
Each to their own Iguess....

It's really simple ask for the Tapley meter and you drive the car with the MOT tester in the passenger seat and said meter on the floor and job done.
As a Mechanic and ex Tester myself I would never let a customer put the car on the ramp or over a pit as that really is the dangerous bit.
Bon Chance.

 

[TimR]

Its all about covering your a55..
whether its customers parking over a pit, or being protective of a LSD, or some trainee mechanic stepping on your pedal box with his jack boots and fumbling for reverse, messing with your seat, and yanking on your handbrake like its a parachute ripcord; what you face on both sides is the unknown....

I trust my brakes, and my AM specialist garage. Trust is earned though...

 

[GTVGEOFF]

Well every day is a school day. You guys have surpassed yourselves, I have learnt something, and twenty posts and we are still on thread.
Still on the subject, it's amazing the difference in prices for the same thing at different garages

 

[philw696]

Well every day is a school day. You guys have surpassed yourselves, I have learnt something, and twenty posts and we are still on thread.
Still on the subject, it's amazing the difference in prices for the same thing at different garages

That's another pet hate of mine discounted MOT tests other than for bona fide Trade.
The Ministry set the fee and that's what people should pay.
Setting up a Test Bay isn't cheap and to earn a decent living which is peanut's to many on here discounting shouldn't be allowed in my opinion.

 

[Mr Spoon]

I assume mot brake test lsd damage is possible in a GT?

 

[Zep]

For the Auto they don’t list seperate parts for the diff, just a complete replacement so it’s not clear what type of diff it has. But I’d assume yes until finding out otherwise.