Measuring brake pad/disc wear?

[Lee]

How do dealers decide how much wear a set of pads and discs have?

The reason I ask is because 6k miles ago the Trophy had it's 12k service. It had new front pads fitted and the rears were noted as being 30% worn.

Today it had an oil and filter change and general checkup. The fronts were at 50% which is understandable after doing 3 track days since they were fitted, but the rears were at 20%, which is obviously rubbish as they were supposidly at 30% 6k miles ago. Is there really that large a margin for error or are they having me on?

Thanks

Lee

 

[Neal 182]

Having go on.

 

[edde]

They do it by looking thoguh the gap its more guesswork hence why number go up and down.

 

[matty w]

i think they put whatever they feel like,i had my 12000 mile service and the week before i put new discs and pads and they recogned there was 40% wear

 

[Lee]

They do it by looking thoguh the gap its more guesswork hence why number go up and down.

That's what I suspect.

I wanted them to actually look at them. They've been on track 3 times and come off smoking. I wanted a mechanic to have a look for me and tell me how they were. Not give me a rough guess based on the miles the car has done.

I'm going to phone and ask for an explanation.

 

[Fred@BTM]

we've had customers with new brake kits (2 days old) told their brakes have 70% left! ok whatever! its guess work