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David Administrator Owner\Director, AE\NT\SM, DVSA VTS Council Member, Registered Member & Administrator of The MOT Testers & AE's Forum If the facts don't fit the theory, change the facts. Albert Einstein Posts: 6,724 Class tested: 4 Last Online: May 7, 2024 8:44:04 GMT 1 Likes: 965	This weeks Quiz Jul 17, 2014 10:23:32 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by David on Jul 17, 2014 10:23:32 GMT 1 Exactly tom
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This weeks Quiz Jul 17, 2014 12:06:38 GMT 1 nitros44 likes this

Post by David on Jul 17, 2014 12:06:38 GMT 1

We have to remember that fluctuation (excessive or not) is only tested at the held pressure stage of the new procedure.

Fluctuation

During the check for rate of increase on the service brake, there is now a requirement to hold the brake at
a steady pressure to check for excessive fluctuation of brake effort on all wheels.

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This weeks Quiz Jul 17, 2014 16:30:53 GMT 1 David and nitros44 like this

Post by Deleted on Jul 17, 2014 16:30:53 GMT 1

The fluctuation is checked with 'steady pressure' applied - I feel the words 'steady pressure' are the important bits.

For example if a brake locked out at 400kgf, what is stopping me testing that same brake for fluctuation at 100kgf or 200kgf or even 300kgf as long as it is tested with 'steady pressure'

Remembering that uneven application/release has its own failure

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This weeks Quiz Jul 17, 2014 21:22:49 GMT 1 via mobile David likes this

Post by Gaz on Jul 17, 2014 21:22:49 GMT 1

In my experience fluctuation is the same at 100kg, 200kg etc. I always test near maximum force as it makes sense that way to me given the way the MOI is. Sometimes a wheel will lock out before I can get a good look at the fluctuation so I will just drop the brake force by about 40kg and try again.

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This weeks Quiz Jul 18, 2014 0:40:47 GMT 1 David likes this

Post by baz657 on Jul 18, 2014 0:40:47 GMT 1

I personally look at around the 100 - 200 figures as they relate more accurately to the actual day to day usage. Not so much of a problem on the road if you only get brake judder just shy of lockup although it could be an early warning of things to come.

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This weeks Quiz Jul 21, 2014 1:27:49 GMT 1 David likes this

Post by phaetonott on Jul 21, 2014 1:27:49 GMT 1

We can't fail imbalance any more I don't think I've had a car that doesn't lock both fronts.

We can fail for uneven application or release, and we can fail for fluctuation. it would be nice if DVSA gave us an acceptable figure for both

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This weeks Quiz Jul 21, 2014 21:15:21 GMT 1 David likes this

Post by nitros44 on Jul 21, 2014 21:15:21 GMT 1

pete
Although other members have given the correct answer its only fair to say you where the 1st to give the correct answer.
Excessive fluctuation is tested at the point of "holding a steady pressure"and not at any other time.
Where excessive fluctuation is evident during the increase/decrease element or applying the brake for max effort its a pass and advise.
So pete
Its down to you for the next quiz question,as baz657 mentioned it can be anything you like,
Cheers.

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