2014+ Brake Master Cylinder Question - Mazda3 Forums : The #1 Mazda 3 Forum
 
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post #1 of 6 (permalink) Old 08-05-2016, 04:33 AM Thread Starter
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2014+ Brake Master Cylinder Question

Purchased a brand new 2016 with manual trans. Go to inspect my brake fluid level after one month/700 miles, and lo and behold I see black particles in it (see attached photo). These were definitely not in there when I initially checked the level, and there's too much debris in there to qualify as a flake or two that just fell in. Anyone ever see this before?

The dealer has no explanation. They also claim my debris screen is broken or "pushed in" but it's always looked like that. The cap and debris screen on the loaner 3 they gave me is clearly a different design, so I'm wondering if that's just a subtle example of the small design differences between the master cylinders for the autos vs. the manuals. If someone could confirm or deny that with photo evidence, that'd be a big help.
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-Mapwheel
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post #2 of 6 (permalink) Old 08-05-2016, 10:43 AM
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Originally Posted by mapwheel View Post
Purchased a brand new 2016 with manual trans. Go to inspect my brake fluid level after one month/700 miles, and lo and behold I see black particles in it (see attached photo). These were definitely not in there when I initially checked the level, and there's too much debris in there to qualify as a flake or two that just fell in. Anyone ever see this before?

The dealer has no explanation. They also claim my debris screen is broken or "pushed in" but it's always looked like that. The cap and debris screen on the loaner 3 they gave me is clearly a different design, so I'm wondering if that's just a subtle example of the small design differences between the master cylinders for the autos vs. the manuals. If someone could confirm or deny that with photo evidence, that'd be a big help.
I'll take a quick shot of our 2016 s GT with a manual transmission either tonight or tomorrow and post it up for you. At this point our car only has about 500 miles on it.

1999 Chrysler T&C Limited
2001 Honda Accord V6 EX
2016 Mazda3 s GT 5-Door 6-Speed Manual
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post #3 of 6 (permalink) Old 08-05-2016, 11:13 AM
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I wouldn't worry about that. Just grab a turkey baster or a syringe and suck that stuff out of there and add new fluid to the exact level its at now. Dealership is going to do the same thing if you go back to them.

You could bleed it all yourself by cracking open the bleeder and doing a traditional bleed at the rear passenger side until you've gone through a whole bottle of fluid.

if it were me...........suck those out, refill and check back maybe a month later.
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post #4 of 6 (permalink) Old 08-05-2016, 11:52 AM Thread Starter
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Originally Posted by atxjax View Post
I wouldn't worry about that. Just grab a turkey baster or a syringe and suck that stuff out of there and add new fluid to the exact level its at now. Dealership is going to do the same thing if you go back to them.

You could bleed it all yourself by cracking open the bleeder and doing a traditional bleed at the rear passenger side until you've gone through a whole bottle of fluid.

if it were me...........suck those out, refill and check back maybe a month later.
More than anything, I would love some theories on how so much debris got into a brand new, closed system.

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post #5 of 6 (permalink) Old 08-05-2016, 11:57 AM
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More than anything, I would love some theories on how so much debris got into a brand new, closed system.

Could be rubber imperfections from any of the seals in the system especially the sealing cap on the resevoir.

Minute debris from the manufacturing process of the hard metal lines.
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post #6 of 6 (permalink) Old 08-05-2016, 12:01 PM Thread Starter
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Could be rubber imperfections from any of the seals in the system especially the sealing cap on the resevoir.

Minute debris from the manufacturing process of the hard metal lines.
It's above the debris screen so I'm thinking imperfections in the cap is most likely. And through some dilligent research I found out the fluid reservoir got a redesign in 2016... new cap, new screen, slightly different geometry in the plastic. I wonder if they used substandard material.

Edit: apparently everyone else's looks like this: http://imgur.com/a/s9yLA

-Mapwheel

Last edited by mapwheel; 08-05-2016 at 12:03 PM. Reason: link
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