hayden
Nominated Tester
VTS AEDM, SM & QC
Posts: 828
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Post by hayden on Apr 9, 2010 5:22:35 GMT
hi all
ford fiesta with front brake caliper spring clip missing, fail or pass and advise ?
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Daveg
NT & VTS Council member
I believe I am perfect, but others may differ in opinion?
Posts: 1,549
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Post by Daveg on Apr 9, 2010 21:54:23 GMT
The spring clip I think you are refering to is correctly located into two holes in the side of the brake caliper body, where the spring holds the caliper body against the brake pads shoulders. The spring is in contact with the caliper at both ends top to bottom and is like a leaf spring. This spring is not a securing device where the caliper must be free to slide, but retains the caliper in a set position when a brake load is applied to reduce the caliper body from moving out of alignment during braking.
Because the spring is not a securing device and would not have a direct effect on braking performance, there is no regulation in the mot test to cover this issue and would therefore result in a 'Pass and Advise' in my opinion.
Dave
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hayden
Nominated Tester
VTS AEDM, SM & QC
Posts: 828
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Post by hayden on Apr 10, 2010 4:04:31 GMT
my opinion as well as i did pass and advise, but another tester i know disputed this saying it was a locking device and always failed it. i showed him the relevant section in the the manual, but was adamant he was right, so i thought i would get some input from the forum. thanks for the reply. on a different note, checked our risk score yesterday and we are now in the green. ;D
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Daveg
NT & VTS Council member
I believe I am perfect, but others may differ in opinion?
Posts: 1,549
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Post by Daveg on Apr 10, 2010 12:57:55 GMT
I think based on my understanding of the spring, that if it were a locking device then it would lock the caliper in a set position, which means that the caliper would not be free to slide during operation, which would then either in an extreme case stop the brakes working when the pads wear thin, or create a brake imbalance across the axle if one spring were fitted and the other not fitted.
However by observation it is clear the spring is designed to reduce the caliper body from twisting when the brakes are applied, a typical math equation for calculating the bending stress applied through the spring is;
stress; 6FL/bh^2
and the maximum deflection the spring is designed to withstand could be calulated by;
deflection stress; 6FL^3/Ebh^3
Dave
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scoot
Nominated Tester
Posts: 305
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Post by scoot on Apr 10, 2010 18:00:54 GMT
your taking the p*ss now,i dont know if your for real ?
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Daveg
NT & VTS Council member
I believe I am perfect, but others may differ in opinion?
Posts: 1,549
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Post by Daveg on Apr 10, 2010 18:14:22 GMT
What is it that you don't understand?
Dave
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hayden
Nominated Tester
VTS AEDM, SM & QC
Posts: 828
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Post by hayden on Apr 10, 2010 18:49:26 GMT
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Daveg
NT & VTS Council member
I believe I am perfect, but others may differ in opinion?
Posts: 1,549
|
Post by Daveg on Apr 11, 2010 11:17:39 GMT
With reference to the thread regarding the Traffic Light System and you Hayden saying you are in the Green because you NT checked it, is that possible for an NT to see via Computerisation how the station is performing, or did the AE tell you this info?
If not please do advise where on Computerisation you got the info from?
Thanks
Dave
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