Brake fluid level warning light - Mazda CX3 Forum
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post #1 of 11 Old 10-31-2017, 07:54 PM Thread Starter
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Brake fluid level warning light

My car was in 2nd annual service today and they changed the brake fluids. After that the brake warning light has been constantly on and there is a warning message shown in the center display. Of course they didn't know what caused it.

They also fixed the loose rear spoiler and they managed to scratched the paint.
So the spoiler needs to be repainted and they need to investigate what they messed up with the brake fluid change.

What kind of level sensor does cx-3 have for brake fluid?

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post #2 of 11 Old 11-01-2017, 02:13 AM
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Why did they change the brake fluid in the first place? Its not part of the annual requirements as far as I know. It also needs to be done right. I am not an expert, but changing the brake fluid is a long process including draining, flushing it, and the refilling the entire system without introducing any air into it. It is suppose to be a "closed" system.
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post #3 of 11 Old 11-01-2017, 03:28 AM
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Yes, the car should have the fluid changed at the second service. Its just a normal float switch in the master cylinder but changing the fluid is a very involved process if done by the book. If the master cylinder is topped right up and the pedal feels good its probably nothing to worry about. (pump the brake pedal with the engine off and it should become virtually solid after about 6-10 pumps)
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post #4 of 11 Old 11-01-2017, 03:54 PM
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Quote:
Originally Posted by anchorman View Post
Yes, the car should have the fluid changed at the second service. Its just a normal float switch in the master cylinder but changing the fluid is a very involved process if done by the book. If the master cylinder is topped right up and the pedal feels good its probably nothing to worry about. (pump the brake pedal with the engine off and it should become virtually solid after about 6-10 pumps)
Heck - that is some convoluted set of steps indeed in that pdf !!! Steps 1-7 I'm very familiar with on older cars of years gone by when I used to bleed them myself. Step 8 however, with its 31 sub-steps, must be an excuse for a Mazda garage to charge a minimum of at least 3 hours labour at some extortionate cost !!! I bet it's not part of the standard 2nd year service schedule covered by my Mazda 3yr service plan

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post #5 of 11 Old 11-01-2017, 08:59 PM
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I wonder if it’s really necessary but you never know, it might be the cause of the spurious light.

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post #6 of 11 Old 11-02-2017, 09:56 PM
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Check the fluid at the 2 servicing, maybe, but change it...absurd! I had a MAZDA 3 for 12 years and it never had, or had to have a brake fluid change.
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post #7 of 11 Old 11-03-2017, 11:54 AM
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On 2016 and newer CX-3's, there's no mention of a brake fluid flush in the scheduled service. As usual, they do mention an inspection of all fluids.
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post #8 of 11 Old 11-04-2017, 09:10 AM
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Originally Posted by bbourassa View Post
Check the fluid at the 2 servicing, maybe, but change it...absurd! I had a MAZDA 3 for 12 years and it never had, or had to have a brake fluid change.
That’s a rather old fashioned and very misguided statement to make. Now, more than ever before, it is very important to change the fluid every two years. Brake fluid is hygroscopic and will naturally absorb moisture from the atmosphere. The reservoir cap has to breath and therefore admits the atmosphere into contact with the fluid. The danger of moisture in the fluid used to come from the risk of boiling or steam pockets causing a loss of pressure but these days it’s for another reason. The ABS pump generates pressure to modulate the brakes during the operation of ABS and the VSC. These pumps and valves have astonishingly fine tolerances that can be completely ruined by corrosion. Furthermore, all the rubber seals of which there are many, have tendency to transfer microscopic rubber particles into the fluid so it becomes rather “muddy” especially near the calipers. Anybody that has changed fluid after about 3 or 4 years will see this darkened fluid discharged during bleeding. To summarise, my advice is that you could get away with not changing the fluid in the short term but you are taking a very expensive risk by extending it too long.
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post #9 of 11 Old 11-06-2017, 03:02 PM
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Originally Posted by anchorman View Post
That’s a rather old fashioned and very misguided statement to make. Now, more than ever before, it is very important to change the fluid every two years. Brake fluid is hygroscopic and will naturally absorb moisture from the atmosphere. The reservoir cap has to breath and therefore admits the atmosphere into contact with the fluid. The danger of moisture in the fluid used to come from the risk of boiling or steam pockets causing a loss of pressure but these days it’s for another reason. The ABS pump generates pressure to modulate the brakes during the operation of ABS and the VSC. These pumps and valves have astonishingly fine tolerances that can be completely ruined by corrosion. Furthermore, all the rubber seals of which there are many, have tendency to transfer microscopic rubber particles into the fluid so it becomes rather “muddy” especially near the calipers. Anybody that has changed fluid after about 3 or 4 years will see this darkened fluid discharged during bleeding. To summarise, my advice is that you could get away with not changing the fluid in the short term but you are taking a very expensive risk by extending it too long.
I stand notably corrected.
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post #10 of 11 Old 11-06-2017, 03:22 PM Thread Starter
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Originally Posted by anchorman View Post
Its just a normal float switch in the master cylinder
Is it a reed switch?
The warning light turned off by itself while i was driving on rough/bumpy road.
Tomorrow they will repaint the spoiler (and probably do a bad job).

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