ZF diff & MOT

[Beelzebub]

What's the script when MOTing a car fitted with a ZF LSD 🤔 I'd hate to hear expensive noises from my diff if he tests the rear brakes one at a time.

 

What's the scoop 🤔

[Beelzebub]

Found the answer here under "Vehicles not to be tested on a roller brake tester" 😬

 

Just wondering, Is replying to your own posts the same as talking to yourself 🤔

 

Edited by - Davesport on 17 Feb 2006 17:24:26

[DohNut]

Under the section of transmition (Prop-shaft) brakes - Mechanical Parking

 

To avoid possible damage, the parking brake efficiency requirement should be calculated using the appropriate vehicle weight before the brake is tested.

Testing of the brake should cease as soon as the minimum efficiency requirement is reached when progressively applying the brake.

 

Looks good for a NormanV style brake.

 

Nick

[Andy A]

 

So whats the deal? Do you have to find someone with the right equipment?

 

That would put an end to my "looks about right" "side repeaters? What are they?" friendly local MOT station.

☹️

 

[Rob Walker]

Cars are now tested on the rollers irrespective of if they have a ZF diff. New instructions have been issued to SVA and Mot stations telling them to test as no damage will occur to the diff. I of course protested but had to allow the test or go home without the certificate. The only chance you have now is set your exhaust box very low so that it will foul the floor when on the rollers, they have no answer for this YET. 😬

[Graham Perry]

But there are lots of older vehicles and lots of 4 wheel drives where the roller brake test isn't possible. Have they abandoned the use of the Tapley meter then for such cars ?

 

Edited by - Graham Perry on 17 Feb 2006 20:59:46

[Andy A]

 

So have there been any reports / evidence / expert opinion of diff damage due to rollers?

Seems to me there are a few other car types out there with LSD.

 

 

[rgrigsby]

My ZF type diff as been tested twice on rollers for an MOT, after the first time it did make some strange noises for a while afterwards but it still works. It was later checked out by R&R and they found no problems or damage at all so I can only conclude that they are fine.

 

Rob G

www.SpeedySeven.com

[Bricol]

Graham - the calibrated brick is still kept carefully in a nice wooden box in each of the two places I've used recently - with the integrale I always mention that if they want to test it on the rollers, they can pay to have it fixed afterwards . . . . neither have argued and simply gone up the road with it.

 

At the slow speed the rollers run at, with a two wheel drive car, I can't see any problems - but my normal MOT place reckoned the book suggested not testing, as the diff would interfer with the reading . . .

 

Bri

[Normans_Ghost]

Can't see why a lsd shouldn't be on a brake tester as long as the rollers are both turning.

 

But noticed this:

 

Vehicles certified by the London Science Museum as being designed before 1 January 1905 and constructed before 31 December 1905 do not require a parking brake

 

Now where's that Tipex.

 

Norman Verona, 1989 BDR 220bhp, Reg: B16BDR, Mem No 2166, the full story here

You and your seven to The French Blatting Company Limited

[Wahey]

my mot station tests both wheels on one axel at the same time so I think I must be missing a point here but I can't see why that would be a problem - it would just be like driving in a straight line.

 

When I used to take a subaru there, they used a box in the passenger footwell.