Bike Forums - Disque Break Pads: Ware them down to the boan?

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- - Disque Break Pads: Ware them down to the boan? (https://www.bikeforums.net/bicycle-mechanics/1247717-disque-break-pads-ware-them-down-boan.html)

Quote:

Originally Posted by Iride01 (Post 22442372)

What do you do to get that many worn out pads?

Long downhills.

The ones that can take you well over 30 mph.

And folks that don't want broken bones.

Quote:

Originally Posted by Iride01 (Post 22442372)

So how are you measuring those to determine they are worn? It's only the pad thickness that you go by. With calipers, zero them out on the base the pads are mounted to, then measure the entire thing which will give you the pad thickness relative to where you zeroed the calipers.

https://cimg6.ibsrv.net/gimg/bikefor...a854e39a5a.png
https://si.shimano.com/pdfs/dm/DM-R8050-01-ENG.pdf

What do you do to get that many worn out pads? That's like 24 years of cycling for me! <grin>

About 90% are mine. The sick thing is I've gone through many more. I do about 3000 ft of steep downhill (up to 22% grade) and 3000 ft of uphill on my usual ride/commute (just did so today, about 25 miles), on narrow winding roads in the redwoods, so I brake a lot. Couple that with sub-clinical paranoia, and I have personally depleted the word's supply of J03A and its predecessors.
https://cimg1.ibsrv.net/gimg/bikefor...6727895103.png

I am measuring the pad + backing and subtracting from that sum the backing only, using digital calipers (the functional equivalent of re-zeroing, but mine don't do that). I've been changing them at about 0.9mm net thickness, which is what the instructions I read said to do. They must have revised the instructions, which would make sense, because the bone-shaped wear pattern is visible at 0.5mm.

The good thing about that collection/hoard is I can go back and put them in and wear down about 0.3 or 0.4 mm more in many instances. (I would put them in the back so as not to die.)

That pretty much answers my question, if they have revised the advisory to change when worn to a net thickness of 0.5mm.

Quote:

Originally Posted by soyabean (Post 22442359)

It's Bad 2 Da Boan.

i shoulda noan that

Polaris OBark

Just notice that I was only showing that as a reference for how to measure. And that my example is from the DM for the Ultegra R8050 series which covers my BR-R8070 brakes. So find the manual for your brakes to get the minimum recommended pad thickness.

https://si.shimano.com/

If you go through that many pads, then maybe you'd be better off wearing them down to nothing and just accepting that you might have to replace the entire brake every so often. Or find someone that can give you a really good deal if you buy brake pads by the gross. <grin>