2512pf Posted July 28, 2015 Report Posted July 28, 2015 im trying to under stand how if a car has an lsd fitted its ok to test on the mot brake rollers? I understand the rollers measure each wheel brake efficiency ,so how can this work when both wheels are supposed to be "locked" together or are they not supposed to be tested on brake rollers?
Admin Vista Posted July 28, 2015 Admin Report Posted July 28, 2015 My mot station doesn't test my rears on the rollers
katana Posted July 28, 2015 Report Posted July 28, 2015 My mot station doesn't test my rears on the rollers ? ? ? ? - Hmmmm sounds dubious to me - what do they do for handbrake function............find a steep hill?
Admin Vista Posted July 28, 2015 Admin Report Posted July 28, 2015 Hand brake is fine as it tests both wheels simultaneously, my recollection is that what they don't do is test each rear wheel individually
Seedy105 Posted July 28, 2015 Report Posted July 28, 2015 It is possible to mot a car and not use the brake rollers, using an old school tapley meter instead, if the vehicle is 4wd, or has an lsd fitted, and you are not sure if the brake rollers will cause any damage, then this is what should be used! In reality, most lsd,s should be ok, unless they are set very tight with lots of preload, but I always use the tapley meter anyway, to be sure of no damage. If you advise your mot tester about its fitment, he should be ok using this method! Hth, Paul
Paulfosk Posted July 28, 2015 Report Posted July 28, 2015 The only time you're gonna have a problem is with a welded diff, lsd will be fine on rollers 2
deltamal Posted July 28, 2015 Report Posted July 28, 2015 My Mk3 Cortina with Capri slipper diff has been through 10 MOT's now with no problems, fitted as standard on the big engine Capri's so must be ok....
Moderator Rally Pack 2000 Posted July 29, 2015 Moderator Report Posted July 29, 2015 Wow do you guys have to put your cars on rollers to test the brakes? Here they have some handheld device that has some kind of G force measurement when you slam the brakes on from a certain speed. Your method sounds more accurate.
mk1del Posted July 29, 2015 Report Posted July 29, 2015 I'm a mot tester ,do not test LSD on brake rollers, Tapley meter test on road only, same has doing 4x4 ,later Mazda mx5 have LSD, same test tells you on information when booking on computer , both wheels rotate same way when jacked up, if damage is caused by roller brake testing garage is responsible ,owner should make tester aware when presenting car for test,
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