DIY brakes-1st time - Toyota Yaris Forums

komichal · 09-30-2019, 09:47 AM

Yes, the lip is the rusty part along the edge of the rotor.

You can measure the rotor to see if it is still thick enough or not. The rotor should be at least 19mm thick. If it is less then the rotor needs replacing. It may not be urgent if it is just slightly less and you are not a race driver.
Some rotor manufacturers state that their rotor should be 20mm thick at least. But the originals have 19mm in their spec.
When measuring the rotor make sure your measuring device bypasses the lip! You need to measure the thickness of the active area. Either use a micro-meter or use some washers with well defined and measurable thickness, place those washers on both side of the rotor, measure the thickness and then subtract the washers. :)

It is actually a good idea to measure the rotor first and to visually check the thickness of the brake pads before you disassemble it. This can be done when the car still sits on the ground, with all four wheels on. Just turn the wheel to one side so that you can see the brake caliper inside the wheel well. Measure the rotor, snap a picture of the pads and you will quickly see whether you need to buy some new stuff or the old one is still good (so your brake job would be "just" to take the brakes apart, clean them, lube them and put them back). It is quite annoying to take the wheel off, dismantle the brakes and only then to find out that you need to buy new pads.

If you find out (or decide) that you will replace the rotors then you MUST change the pads as well! No matter how good they are.

And always change the brake part components on both sides of the vehicle in order to have a well balanced braking.

I also assume that you are changing your brake fluid once per two years. And by changing I mean replacing the liquid in the reservoir and bleed out all wheels till the clean liquid comes out. Not just the content of the reservois as many shops do...

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09-30-2019, 09:47 AM	#6
komichal View User's Garage Drives: Yaris 2007 1.3 2SZFE 64kW Join Date: May 2012 Location: CZ Posts: 337	Yes, the lip is the rusty part along the edge of the rotor. You can measure the rotor to see if it is still thick enough or not. The rotor should be at least 19mm thick. If it is less then the rotor needs replacing. It may not be urgent if it is just slightly less and you are not a race driver. Some rotor manufacturers state that their rotor should be 20mm thick at least. But the originals have 19mm in their spec. When measuring the rotor make sure your measuring device bypasses the lip! You need to measure the thickness of the active area. Either use a micro-meter or use some washers with well defined and measurable thickness, place those washers on both side of the rotor, measure the thickness and then subtract the washers. :) It is actually a good idea to measure the rotor first and to visually check the thickness of the brake pads before you disassemble it. This can be done when the car still sits on the ground, with all four wheels on. Just turn the wheel to one side so that you can see the brake caliper inside the wheel well. Measure the rotor, snap a picture of the pads and you will quickly see whether you need to buy some new stuff or the old one is still good (so your brake job would be "just" to take the brakes apart, clean them, lube them and put them back). It is quite annoying to take the wheel off, dismantle the brakes and only then to find out that you need to buy new pads. If you find out (or decide) that you will replace the rotors then you MUST change the pads as well! No matter how good they are. And always change the brake part components on both sides of the vehicle in order to have a well balanced braking. I also assume that you are changing your brake fluid once per two years. And by changing I mean replacing the liquid in the reservoir and bleed out all wheels till the clean liquid comes out. Not just the content of the reservois as many shops do...