Why do they do it?

hippolover · Apr 9, 2010

What is it about (some) MOT testers who think that a Discovery will just drop straight on a rolling road to do the brake test? This is what happened to mine the other night and when I questioned it I was advised that the car is only really a 'one wheel drive' in other words two or four wheels will spin and it only needs one to turn to drive the car. (That's what I thought the diff lock was for in extreme slippy conditions.) Nonetheless on it went and the test was done. Watching him trying to lock the back wheels was painful as he ended up almost standing up, hanging on to the steering wheel!!!!! Of course he had just checked the load sensing valve as part of the earlier test so it was never going to lock up anyway with no weight on the back. :doh:

I'm going elsewehere for MOTs from now on.........

Is my rant justified?

Trewey · Apr 9, 2010

no

unless it's an ancient rolling road, it's fine.

ratty · Apr 10, 2010

I try and use MOT places that use a decelerometer (tapley meter). I fecking hates my landy going on brake rollers.

Trewey · Apr 10, 2010

ratty said:
I try and use MOT places that use a decelerometer (tapley meter). I fecking hates my landy going on brake rollers.

Why?

discool · Apr 10, 2010

A rolling road is for testing a engines performance at the wheels.
MOT brake testing rollers are in two parts only one wheel is tested at a time with one roller going forwards and one going backwards so not to damage a diffs.
If you want more info just look at the www.

Trewey · Apr 10, 2010

discool said:
A rolling road is for testing a engines performance at the wheels.
MOT brake testing rollers are in two parts only one wheel is tested at a time with one roller going forwards and one going backwards so not to damage a diffs.
If you want more info just look at the www.

eggzackly

hippolover · Apr 11, 2010

My own opinion is - permanent 4x4 = Tapley meter or decelerometer (Sunday name)
switchable 2 or 4wd or 'normal car' = rolling brake tester

saves any dubiety.

VOSA guidelines are that even some ordinary 2wd cars needn't necessarily go on the rolling road, especially if they have low spoilers, etc or small wheeled cars e.g. early Minis (One of mine lost a clutch last year with the ham-footedness of the same tester using full throttle and dipping the clutch to extracate it!!!!)

iannotts · Apr 12, 2010

ratty said:
I try and use MOT places that use a decelerometer (tapley meter). I fecking hates my landy going on brake rollers.

Me too

Just so happens that the place i have used for yrs does this

mickdj · Apr 12, 2010

telling you ist only 1 wheel drive is wrong it will only drop to 1 wheel drive if one wheel was off the floor whilst all four wheel have traction it will be putting power through all of them and you shoulnt use brake rollers on 4 wheel drive cars iv yet to see a 4 wheel brake roller the should use a decelerometer as some one said ealyer

discool · Apr 13, 2010

Rubbish! why do you have to lift a wheel off the floor when placing in on a roller in the floor will do the same thing allowing that wheel to spin, as we all know when one wheel looses grip the remaining three don't have any drive. You can also put the center diff into neutral if you wish.

Why do they do it?

hippolover

New Member

Trewey

Cockernee, Pasty munchin bastid.

ratty

I'm not special I'm limited edition

Trewey

Cockernee, Pasty munchin bastid.

discool

Well-Known Member

Trewey

Cockernee, Pasty munchin bastid.

hippolover

New Member

iannotts

New Member

mickdj

New Member

discool

Well-Known Member

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