2014 Q50 Brake Reservior - Infiniti Q50 Forum
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post #1 of 17 (permalink) Old 09-10-2019, 10:31 PM Thread Starter
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Question 2014 Q50 Brake Reservior

Did a front brake job on my Q and noted that the brake master cylinder reservior tank has two chambers - the front chamber is about a third of the size as the main chamber. Also, there is a small plastic "knob" on the side of the front chamber. During and after purging the old fluid, I noted that the front chamber still contained the old, dark fluid and did not purge like the main chamber.

What is the front chamber used for? Is it an overflow chamber? Is the knob on the side a drain for that chamber? Does it twist or pull or _____?

Several mechanics, as well as parts counter personnel in the area have no idea. Alldatadiy was no help either.

Help?
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post #2 of 17 (permalink) Old 09-10-2019, 10:40 PM Thread Starter
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post #3 of 17 (permalink) Old 09-11-2019, 11:02 AM
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I've never noticed that on my own car but I haven't had to change my brake fluid out yet, if I was to take a guess it's likely a dedicated fluid is for the ABS system or overflow chamber as you suggested
Let me check the SM though and see what it says, I'll update my post with the findings.

Edit:

Hmmm I don't actually see anything in the SM that covers the reservoir itself in any great detail, I'm starting to lean
towards the fact it's an over-flow chamber and you just need to bleed off the old brake fluid.

I'm sure someone else will chime in here, but if not maybe give the dealership a call and have them confirm.

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Last edited by BigHeadClan; 09-11-2019 at 11:20 AM. Reason: Update:
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post #4 of 17 (permalink) Old 09-11-2019, 11:25 AM
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What is Alldatadiy?

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post #5 of 17 (permalink) Old 09-11-2019, 11:53 AM Thread Starter
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Alldatadiy.com. It’s a paid online service manual site. It’s OK but not very detailed. Sure beats a Chilton, etc., though.
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post #6 of 17 (permalink) Old 09-11-2019, 11:55 AM
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What is Alldatadiy?
Alldata is an online database that non-dealer shops subscribe to to access service information. It appears Alldatadiy is the same type of site but designed for the non-professional do-it-yourselfer. It used to be our local libraries had a subscription to Alldata but the last time I used it, the information available at no charge was rather limited.

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post #7 of 17 (permalink) Old 09-11-2019, 12:29 PM
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Originally Posted by BigHeadClan View Post
I've never noticed that on my own car but I haven't had to change my brake fluid out yet, if I was to take a guess it's likely a dedicated fluid is for the ABS system or overflow chamber as you suggested
Let me check the SM though and see what it says, I'll update my post with the findings.

Edit:

Hmmm I don't actually see anything in the SM that covers the reservoir itself in any great detail, I'm starting to lean
towards the fact it's an over-flow chamber and you just need to bleed off the old brake fluid.

I'm sure someone else will chime in here, but if not maybe give the dealership a call and have them confirm.
My understanding of the brake fluid reservoir design is that there are two sides divided by a baffle plate, one side is for the fluid going to the master cylinder and the other is the return from the ABS actuator and electric control unit. The brake fluid level can fluctuate during operation and exceed the level of the baffle plate. Excess brake fluid spills over into the overflow chamber of the reservoir in order to maintain the proper brake fluid level in the main reservoir.

It's not for dedicated brake fluid for the ABS system based on the design diagrams of the braking system I'm looking at. The output from the master cylinder goes exclusively to the ABS actuator and electric control unit.

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post #8 of 17 (permalink) Old 09-11-2019, 01:49 PM
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My understanding of the brake fluid reservoir design is that there are two sides divided by a baffle plate, one side is for the fluid going to the master cylinder and the other is the return from the ABS actuator and electric control unit. The brake fluid level can fluctuate during operation and exceed the level of the baffle plate. Excess brake fluid spills over into the overflow chamber of the reservoir in order to maintain the proper brake fluid level in the main reservoir.

It's not for dedicated brake fluid for the ABS system based on the design diagrams of the braking system I'm looking at. The output from the master cylinder goes exclusively to the ABS actuator and electric control unit.
So if I understand your explanation correctly, one would just remove the old fluid from this "overflow chamber" and not replace it with fresh fluid? And are you saying there are three chambers total?

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post #9 of 17 (permalink) Old 09-11-2019, 01:52 PM
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Drained my brake fluid last spring and didn't notice there were two chambers.

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post #10 of 17 (permalink) Old 09-11-2019, 02:07 PM
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So if I understand your explanation correctly, one would just remove the old fluid from this "overflow chamber" and not replace it with fresh fluid? And are you saying there are three chambers total?
I haven't drained my reservoir so I can't see the internals to verify the existence of a inlet/outlet baffle plate. qw50adix says there isn't one so this particular design evidently doesn't use it.

I would think one would drain old brake fluid from the "overflow chamber" in addition to the fluid in the main reservoir but I'm not sure when refilling with new brake fluid that the "overflow chamber" would be filled also. I don't think so though.

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