Clio 172 CUP M.O.T. Failure

[Big Bob]

So took my cup for an MOT and it failed

and guess what on ...... yes rear brake pressures they are down at L18 and R22 and the guy said these need to be at least 100.

but is this right ?

there is no air in the system its been checked.

any help please would be much appreciated.

 

[Matt Cup]

Did you show him the dvla form about the 172 cup?

 

[mattjones]

http://www.dft.gov.uk/vosa/repository/MoT Issue 31 - Apr 2006.pdf

Take page 8 of this to the garage. I had the same thing with mine mate

 

[Big Bob]

Did you show him the dvla form about the 172 cup?

no i couldn't find it anymore, really appreciate this ^^^ ill show them and hopefully ill get through

 

[Beasley Clio182]

So took my cup for an MOT and it failed

and guess what on ...... yes rear brake pressures they are down at L18 and R22 and the guy said these need to be at least 100.

but is this right ?


there is no air in the system its been checked.

any help please would be much appreciated.

Question, ive read through that , and all seams fairly basic , but what the tester has failed it on, indicates the back brakes are doing pretty much nothing in the rollers at 18 and 22

Quite curious as the bias valve changes pressure but surely not to the extent that the rear brakes dont work?
​

 

[Fred@BTM]

yep, on 172 cups the rears basically do nothing, ring VOSA

 

[Beasley Clio182]

yep, on 172 cups the rears basically do nothing, ring VOSA

Lol new one on me !! i was going to say what they are saying there is modification to the valve as a failure , and 'low' braking force but literally no braking force is shite lol new one for me !!!

 

[Fred@BTM]

they work, but not alot, you could stop 20times from 100mph get out a lick the rear discs with your tounge

 

[Big Bob]

they work, but not alot, you could stop 20times from 100mph get out a lick the rear discs with your tounge

Dirty Boy !!!!! lol

 

[Beasley Clio182]

they work, but not alot, you could stop 20times from 100mph get out a lick the rear discs with your tounge

HAHAHA lol i like the idea but i wont be trying it !! what a crazy stupid idea renault came up with there !!

 

[MG cup]

Its a brilliant idea for a fast road/track car, it means you don't have to touch them and hence why there is a bulletin out for MOT stations. Its that or you will be going backwards ever time you brake.

 

[Beasley Clio182]

Its a brilliant idea for a fast road/track car, it means you don't have to touch them and hence why there is a bulletin out for MOT stations. Its that or you will be going backwards ever time you brake.

Silly question alert ....

Why is it good ? surely you want the back brakes to be doing something ? obviously you dont want to over the power the fronts as it will swap ends but having very little effort seams crazy to me ?

 

[Big Bob]

No such thing a s a silly question !!!!

Certainly not in my threads, i welcome them

 

[MG cup]

Silly question alert ....

Why is it good ? surely you want the back brakes to be doing something ? obviously you dont want to over the power the fronts as it will swap ends but having very little effort seams crazy to me ?

The rear brakes do something, just not a lot. The back of the car is so light and the fronts so heavy. The braking is proportional to the amount of weight on an axle. Pretty much every FWD car you want to wind the bias towards the front when out on track, its brilliant that Renault done it out the box.

 

[Edges]

Why is it only on 172 cups this happens? Surely the weight over the rear is very similar across every mk2??

 

[Laine_16v]

The read compensator isnt connected to anything and they seize up and become worse over time.

Just had mine MOT'd and they pulled 50kg's each side i think, which as far as rear brakes go is the square root of f**k all i believe lol.

 

[Big Bob]

Just went back to the garage and they where completely unaware of this and as this was issued befpore the garage existed it was new news to them, anyway they contacted VOSA and the confimed that it was OK and told them they can read as low as 10 and still be a pass anything less than 10 is a fail.

On the cup the compensator isn't connect but even if it was it doesn't change the rear brake pressure anyway as we tried adjusting it to get the pressure up originally.

 

[Beasley Clio182]

Well i have learmt something new today ! nice one bob lol !!