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[Kevin Wood]

Sorry , yeah thinking about it you're right  . The propshaft ony tends to spin on a car without lsd.  We stick them in gear if we're not sure whether to do a roller brake test on the MOT, and if it turns opposite way we.re safe , if it won't turn it's lsd.
 Hate to foot the bill for knackering someones lsd , shouldn't think they're cheap. !!

Yep. that's it.  

I doubt most drivers would know if you had knackered them, tbh. Saves them climbing out of the brake tester though.

I have a Ford viscous diff on my Westfield and it doesn't grumble on a brake tester because it doesn't run fast enough but some of the geared LSDs like the Quaiffe ATB, Torsen, etc. can bind up.

Kevin

[pete.h]

Can't say I've ever tried one in the brake tester just in case.!

I think the problem would occur if you did the rear foot brake test to VOSA guidlines.

You're supposed to do each rear wheel individually , so you're trying to turn one rear wheel whilst the brakes on the other three wheels are effectively holding the car still so it wouldn't be able to jump out of the rollers .

With an lsd soething has to give which is either going to be the grip of the tyres on the rollers or the diff. Either way it doesn't do your car much good.

I think what most garages do is test both rear brakes together but you can get in trouble with VOSA for doing it like that .

We just do a road brake test with a Tapley meter to be on the safe side.