Corroded brake discs.

I’ve made several posts regarding corroded brake discs and what is an acceptable level of corrosion.

The description of reason for rejection rgarding disc condition is worded

“a brake disc or drum in such a condition that it is seriously weakened or insecure”

The first example shown below was seen on a 2003 astra rear, in this case the surface of the disc although corroded has not penetrated into the disc so that it is likely to break or crack, the brake performance however showed a slightly different story in that the performance suffered badly enough to affect the rate of application and to cause serious judder.

The following images are from a 2004 Renault Megane Scenic brought in for repair, the customer had heard a bang as she applied the brakes.

As can be seen from the below image, the brake pad is missing, the bang heard was the brake pad “escaping” from the pad carrier.

Once the repair was started the full extent of the problem was revealed, once the disc was removed the inner face of the disc was very severely corroded, and the inner brake pad was metal to metal, or in this example metal to corrosion, it appears the friction material had broken away on the inner pad too. In the image below we’re seeing the face of the pad that should have 1.5mm of friction material, and also can be seen is the way the surface of the disc has been flaking away.

I don’t know how long the brakes have been in this condition but I would have expected a grinding noise to be noticeable for a while beforehand.

Advertisements

2 comments so far

  1. Mot testing in pinner on

    Some times we ignored the Mot Test of Car. But it is highly risk factor. Because accident might be happen at any time for improper maintenance of car. Your Blog again open our eyes that how Mot Test is so important. it is fine.

    • an Mot tester on

      I see this sort of thing regularly, customers are always shocked at how bad things can be before they become a failure, in the current financial climate it seems servicing schedules are being ignored. Customers don’t seem to take on board an MOT is to the minimum standard possible, far below the normal servicing standards the manufacturer specifies, and an MOT really is only about the condition of the vehicle on the day of test


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: