greasemonkey

Jeesh, am I not allowed some time off to eat, drink, p*ss, get away from my PC and generally have a life?!

In answer to your "why don't Subaru mention this in the manual?" point Andy, the only thing I can assume is that they make the assumption that MOT testers can be trusted to follow the procedure laid down for permanent 4WD cars!

andypugh2000

Thought that would get you going I can tell from the bottom of the front page you havent been signed in

also back to the point of subaru making no mention in their hand book, if subaru make no mention then who decided it was a no go to put these on the rollers?? what if everyone is wrong and you can put these on for a short spell with no danger? unless subaru say NO WAY who is right? after all every car i ever owned that has been 4wd or had an LSD has either mentioned that you can or cannot brake test in the conventional way.
The MOT manual above mentions that cars with an LSD cannot be tested in this way but my old ford capri was always tested like this with no problems as LSD means limited slip, not locked diff turning a tight corner would make the wheels turn at different speeds and i asked ford and they didn't know if it would cause damage and my friends LSD's were all tested like this with no problems I think i will give my dealer a ring in the morning and have a chat

Floyd

iTrader: (9)

If the MOT garage bust your car then they are liable to fix the damage. I had my car MOT'd last Friday and they road tested the brakes with a decelerometer type thing in the passenger footwell. The garage told me that when they used to do the max revs diesel test, that cam belts used to go pop and they had to fix them. Even if they got a written acknowlegement as to when it was changed last the damage was down to the garage. This goes for anything else they may damage.

F

andypugh2000

Just spoke to subaru and they said it doesn't mention it in the handbook as it is up to the MOT inspector to run a test the correct way, seeing that my car was tested incorrectly and no damage was done i will leave it at that as i see no point in going back and having a blast about what could have happened keep your eyes peeled for an MOT inspector in the surrey area with an emmisions probe stuck in his butt

Rewolf

Are you sure that the decelerometer test isn't just an excuse to drive your car???

More seriously though, putting a decelerometer into a car isn't anything like the same test as the rolling road test - the road test is a more realistic test of overall braking, including taking into account the effect of worn shocks, etc, but cannot detect problems such as a locked piston or contamination on a rear wheel - if it could, then a slippery bit of road would trigger all sort of false errors. The rolling road on the other hand doesn't take into account shock absorbers or tyre quality.

Just goes to show that an MOT isn't that good a test of the state of your car.

cheeseboy

in ours here it does! It states clearly that in order to perform the brake test, the vehicle is either to be on a 4x4 rolling road, or have one axle jacked up off the ground which allows these wheels to freely spin...

Robbed666

Hi All,

Sorry to say, but my Missus owes a BMW!
That has just had a MOT. The garage used the roller brake tester. The car
also has a LSD rear diff. So reading the MOT manual link, that should also
NOT be tested on the roller type tester, am I correct ?

Rob

andypugh2000

who does she owe it to?? a finance company? no seriously they can be tested as long as they are turned together and not independently of one another, my old capri 2.8i had an LSD diff and that tested fine on the rollers

Puff The Magic Wagon!

iTrader: (2)

Andy

Not so sure m8

From the MOT link

That says to me that LSD ones should not...

Those are separate things, not all added together.

andypugh2000

But a packet of **** has a warning on the back of them that they can kill you, never seen anyone drop dead after lighting up

Leslie

It is possible to overheat the viscous LSD in the gearbox if the car is put on the brake test rollers. It is certainly not very good for it and continuous mot's like that over time may well damage it.

All MOT stations should have a Tapley meter to do the brake test on an AWD car and it sounds like the tester was being lazy. I should insist on it next time.

Les

Gary C

When I took my EVO for a test, the man took one look at the Brembo/AP's and said it would 'probably stop ok' and let it be

Wurzel

iTrader: (1)

So why was my car tested on a 2 wheel roller then if it clearly states in the manual.

And why was Richards Diff sheared ????????

what would the TÜV / Dekra man say if I told him he was not testing my car on the rollers??? he would say sod of then and it would fail the TÜV !!!

sparkykev

I had an Isuzu Trooper, with a LSD, but the one i had previous didn't, and i bet half the owners with cars with LSD's don't even know they've got one, or what it is.
Do the MOT testers testers know either?, can they tell by looking under the car? Do they test the brakes before it goes onto the ramps?

I wonder.

andypugh2000

As I have said before on this thread i have had cars tested many times before with LSD's in the "usual" way with no problems, putting strain on the diffs for a few seconds will not damage them if they are in good condition, some people just preach the worst case cenario all the time and continue to wrap their cars in cotton wool, FFS its only a car!