Hydratrak diff and a mot brake test roller

[Let off some steam Bennett]

I read recently about not putting LSD in a brake test roller, does this apply to the hydratrak diff does anybody have any experience on this. Should they really be using a mechanical G-Meter on the road. Thanks

[lee02]

The first MOT I had on my Tuscan was carried out by Dan Taylor.
They tested the brakes with a G meter.
Dan told me don’t ever put the rear axle on brake testing rollers.
I’ve had a few MOTs since, I’ve always insisted they don’t use rollers. Not had any issues.

[Let off some steam Bennett]

lee02 said:

The first MOT I had on my Tuscan was carried out by Dan Taylor.
They tested the brakes with a G meter.
Dan told me don’t ever put the rear axle on brake testing rollers.
I’ve had a few MOTs since, I’ve always insisted they don’t use rollers. Not had any issues.

I have heard similar from others, thanks mate

[Andonio]

I don't think you heard correctly. It is how thousands of cars are tested every day on MOT tests. The brake rollers run slowly anyway and don't cause any damage.

[GreenV8S]

If you have an LSD, the brake test should be done using a G meter rather than on the rollers.

It isn't that the rollers will damage the LSD, but the LSD will cause the measurement on the rollers to be misleading since the wheel being tested will be helped by the LSD connecting it to the stationary wheel on the other side. You aren't expected to make any judgement about whether the effect of a given LSD is significant - if it has an LSD, it shouldn't be tested on the rollers.

[Let off some steam Bennett]

GreenV8S said:

If you have an LSD, the brake test should be done using a G meter rather than on the rollers.

It isn't that the rollers will damage the LSD, but the LSD will cause the measurement on the rollers to be misleading since the wheel being tested will be helped by the LSD connecting it to the stationary wheel on the other side. You aren't expected to make any judgement about whether the effect of a given LSD is significant - if it has an LSD, it shouldn't be tested on the rollers.

Thanks

[SMB]

https://assets.publishing.service.gov.uk/media/5a7...

Official guidance is that they should not be on Roller brake testers. Any possible damage to plate type LSDs won’t necessarily show up at point of test. The issue is that the system doesn’t flag a car as having an lsd. It relays on the tester knowing or you telling them.

[Let off some steam Bennett]

SMB said:

https://assets.publishing.service.gov.uk/media/5a7...

Official guidance is that they should not be on Roller brake testers. Any possible damage to plate type LSDs won’t necessarily show up at point of test. The issue is that the system doesn’t flag a car as having an lsd. It relays on the tester knowing or you telling them.

Thanks, that says it all doesn't it. I have just had my diff rebuilt so i do not want to take any risks.