Im sure there cheap aluminum castings for those reservoirs since they don't hold pressure. If you're worried about cracking, open it, drain the fluid and verify the lines you have circled aren't visible inside also.

 

Thanks, will do!

 

The reason I'm asking is because I took an impact driver to put the aftermarket mirrors in (yes, stupid idea!!), which I didn't even end up keeping on the bike... and then I noticed those markings. So I'm not sure if the vibrations from the impact driver caused this or if it's like that from the factory, which is why I'm asking here.

 

Yea.... impact driver.....BADDD.... Ok for loosening, never for tightening. Unless you have a smooth trigger finger and only use it to run up the slack on a long bolt then finish it with a hand ratchet.
Good luck.

 

Stupid mistake on my part...so back to the main question, if anyone can confirm whether or not they have those markings, that would be great!

Thanks!

 

Normal casting marks. Your fine, man. Ride on 👍

 

I just wanted to make sure the impact drill isn't what caused this...

Thanks again everyone!

 

No worries.
The impact would rip out the threads before it cracked anything.

 

It kinda did lol!
That's why I used the impact, to "rethread" it to fit the bolt for the aftermarket mirrors. Like I said, not the best idea and lesson learnt!
Worse part, is that I have a tool to rethread and I didn't think to use it until after...

 

There just shrinkage marks from the casted part cooling at different rates within the mold. They have been there since the sec. the part was poured. Some manufactures would have detailed them out, shot peened it for finish and painted it or anodized the part and charged 4x more for it.

 

I asked on Reddit and one person answered that they have no markings at all on theirs.
I'll just replace it, I rather be safe than sorry.

 

If it bothers you just take it to a mechanic I don’t want to be involved if you have an accident. Brakes are important so have it transported to your closest mechanic to check for you. Your only going to get opinions and maybe through photos. Have you looked inside to see any cracks. Look up on YouTube people checking and replacing your fluid maybe

I ordered a new one.

A master cylinder off Ebay, it has similar marks:

View attachment 181628

Another one from a different listing:

View attachment 181629


Or maybe all these guys used uggaduggas to remove their mirrors, lol

Pro tip: don't ever take a close look at the cast aluminum frame.

Almost all of the ones on eBay came off a crashed bike...

Any ways, problem solved, ordered a new one.

 

Here's what it's supposed to look like, provided from "tyuput" on Reddit:

 

No casting marks on my 2014 🤓

 

No casting marks on my 2014 🤓

Thank you! Much appreciated!

 

If you're freaked out about the casting marks, you can use a penetrant crack test dye kit.

The Ultimate Guide to Visible Dye Penetrant Testing

Some handy tips for beginners who are new to visible dye penetrant testing or NDT pros who want an easy reference guide.

magnaflux.com

 

Mine has no marks. 2015.