minimum brake pad thickness, please help
15 January 2006, 12:17 PM
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minimum brake pad thickness, please help
Hi
What is the minimum thickness for a set of standard subaru rear brake pads on a 00 UK impreza turbo (classic shape) before they need replacing? Also, what is the thickness of brand new ones?
I recently had new tyres fitted at a well know, reputable tyre outfit. They told me that the rear pads need replacing and tried to get me to allow them to do it. I refused and when I checked them myself it appears they have minimal wear.
I have measured them with a digital micrometer but I need to know the official recommended minimum thickness so I can quote exact figures rather than opinions. I will be taking this further once I have the info.
Cheers in advance
What is the minimum thickness for a set of standard subaru rear brake pads on a 00 UK impreza turbo (classic shape) before they need replacing? Also, what is the thickness of brand new ones?
I recently had new tyres fitted at a well know, reputable tyre outfit. They told me that the rear pads need replacing and tried to get me to allow them to do it. I refused and when I checked them myself it appears they have minimal wear.
I have measured them with a digital micrometer but I need to know the official recommended minimum thickness so I can quote exact figures rather than opinions. I will be taking this further once I have the info.
Cheers in advance
15 January 2006, 01:38 PM
#2
Around 2mm of material is minimum (not including backing plate). Remember to check both sides of each caliper on each wheel, as they can wear at different rates.
IIRC there is a metal tag on the rear that should contact at 1.5mm (which I think is Subrau's specified absolute minimum) and make a screeching sound, but these often get bent so cannot be relied on. But it's not clever going to bare minimum as pad material has a tendancy to flake off the backing plate when worn very thin and you risk damaging the brake discs. So you can't really go around quoting "official figures" IMO.
Generally speaking, from a mechanical point of view. you should ensure there is enough brake material left to ensure it will run upto its next main service without them wearing to the metal and damaging the rotor - this would be dependent on the driver's annual mileage and driving style.
So anything up to 5mm minimum front and 2mm rear is acceptable limits to replace pads.
IIRC there is a metal tag on the rear that should contact at 1.5mm (which I think is Subrau's specified absolute minimum) and make a screeching sound, but these often get bent so cannot be relied on. But it's not clever going to bare minimum as pad material has a tendancy to flake off the backing plate when worn very thin and you risk damaging the brake discs. So you can't really go around quoting "official figures" IMO.
Generally speaking, from a mechanical point of view. you should ensure there is enough brake material left to ensure it will run upto its next main service without them wearing to the metal and damaging the rotor - this would be dependent on the driver's annual mileage and driving style.
So anything up to 5mm minimum front and 2mm rear is acceptable limits to replace pads.
15 January 2006, 02:21 PM
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I had this with Kwikfit a few years back on a Toyota, the misses took the car in to get some wheels/tyres swapped about and they said the front discs were shot and they wouldn't touch the car unless they could replace the discs as they were dangerous. I called the manager and he swore blind that they were below their minimum thickness which turned out to be 5mm more than Toyotas recommendation!!!
15 January 2006, 02:51 PM
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Originally Posted by ALi-B
Around 2mm of material is minimum (not including backing plate). Remember to check both sides of each caliper on each wheel, as they can wear at different rates.
IIRC there is a metal tag on the rear that should contact at 1.5mm (which I think is Subrau's specified absolute minimum) and make a screeching sound, but these often get bent so cannot be relied on. But it's not clever going to bare minimum as pad material has a tendancy to flake off the backing plate when worn very thin and you risk damaging the brake discs. So you can't really go around quoting "official figures" IMO.
Generally speaking, from a mechanical point of view. you should ensure there is enough brake material left to ensure it will run upto its next main service without them wearing to the metal and damaging the rotor - this would be dependent on the driver's annual mileage and driving style.
So anything up to 5mm minimum front and 2mm rear is acceptable limits to replace pads.
IIRC there is a metal tag on the rear that should contact at 1.5mm (which I think is Subrau's specified absolute minimum) and make a screeching sound, but these often get bent so cannot be relied on. But it's not clever going to bare minimum as pad material has a tendancy to flake off the backing plate when worn very thin and you risk damaging the brake discs. So you can't really go around quoting "official figures" IMO.
Generally speaking, from a mechanical point of view. you should ensure there is enough brake material left to ensure it will run upto its next main service without them wearing to the metal and damaging the rotor - this would be dependent on the driver's annual mileage and driving style.
So anything up to 5mm minimum front and 2mm rear is acceptable limits to replace pads.
Cheers for the info
The pad with the minimum thickness measured 6.9mm (NOT including backing plate, just the actual pad). Says it all really. I will be putting in a written complaint.
Cheers
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