Archive for the ‘imbalance’ Tag

Dangerous tyres once again.

I’m often amazed at the lack of awareness of some drivers.  A Peugeot 307  brought in for mot had an obviously noisy exhaust blow,  the vehicle presenter was surprised when the boss said it was unlikely to pass the test with it blowing as it was.  However we  proceeded to carry out the Mot, before it had even been logged onto the system it was obviously going to be one of those vehicles, just a quick glance before getting into the drivers seat and it was labelled as dangerous to drive.
delaminated-tyre It started poorly and then went from bad to worse, as a glance at the 2 page vt30 shows

The front suspension arm bushes very badly worn and knocking, a rear brake binding, front brakes pulling severely to the right (into the path of oncoming traffic). Never before have I had to issue a VT30 with more than a couple of “dangerous to drive”   items.  Just manoeuvring the vehicle on our forecourt was enough to frighten me, clunking from the suspension, dragging from a rear wheel and then seeing the presence of a child seat in the car was a little worrying too.


Brakes, judder and imbalance

An example of excessive brake judder seen on a Toyota MR2 brought in for an MoT.  In some cases slight judder is visible at Mot time even when there is nothing noticeable in everyday driving, in this case in excess of 30 kg/f  of fluctuation also led to the front brakes being out of balance with a figure of 33% imbalance being observed, the maximum allowed is 25%.

The inner green ring of LEDS when compared to the red LEDS shows the amount of fluctuation visually, and the rapidly changing figures also indicate the range and speed of the fluctuation.

A visual check of the brake discs prior to the test in the roller brake tester didn’t reveal any noticeable defect such as pitting or scale on the surface of the discs.

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