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Old Aug 27, 2011 | 02:46 AM
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matanki's Avatar
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Default Simple, stupid question.....
Hi Everyone!
I'm very new to this site and Corvette. I just purchased a 1984 Manual trans Corvette. I opened the Hood to check all of the fluid levels, and found all of them filled, except one. It isn't labeled, but is on the driver side firewall. Could anyone tell me what it is for, and what kind of fluid that I need to fill it with.

Thank you!


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Old Aug 27, 2011 | 03:25 AM
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SQUIRMIN VERMIN 84's Avatar
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Sounds like your brake master cylinder but an 84 has 2 plastic reservoirs. Is it mounted to a large round black tank on the firewall? Oh, I see it's a stick shift-may also be your clutch cylinder.. Pix would help.
Last edited by SQUIRMIN VERMIN 84; Aug 27, 2011 at 03:27 AM.
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Old Aug 27, 2011 | 08:56 AM
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Originally Posted by SQUIRMIN VERMIN 84
Sounds like your brake master cylinder but an 84 has 2 plastic reservoirs. Is it mounted to a large round black tank on the firewall? Oh, I see it's a stick shift-may also be your clutch cylinder.. Pix would help.
Here's a pic showing the brake master cylinder on an '85. If the reservoir you're asking about is underneath the brake booster, it's the clutch master cylinder and uses brake fluid.

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Old Aug 27, 2011 | 03:14 PM
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Man I gotta clean my engine bay....nice pic..
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Old Aug 27, 2011 | 04:43 PM
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Default Gotcha!
My '84 has another smaller reservoir closer to the driverside firewall.


Originally Posted by touringmike
Here's a pic showing the brake master cylinder on an '85. If the reservoir you're asking about is underneath the brake booster, it's the clutch master cylinder and uses brake fluid.

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Old Aug 27, 2011 | 04:46 PM
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Wow! your engine is super clean!!! I guess after I fill what ever that reservoir is for, I gotta clen my engine compartment. Now, I have a goal!

The reservoir that I'm looking at is bolted to the firewall, and is a right above the battery.

Thank you for the reply, by the way.
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Old Aug 27, 2011 | 06:29 PM
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I've never had a 84 but on my 93 thats where my clutch reservoir is. If you could post a picture that would take all the guess work out of this. I know one of the guys would know right away what it is with a photo.

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Old Aug 27, 2011 | 06:35 PM
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Originally Posted by mrmtrtrnd
I've never had a 84 but on my 93 thats where my clutch reservoir is. If you could post a picture that would take all the guess work out of this. I know one of the guys would know right away what it is with a photo.

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Old Aug 27, 2011 | 09:27 PM
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If it needs to be filled, where did the fluid go? Welcome to the Corvette world.
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Old Aug 28, 2011 | 05:39 AM
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Bolted to the firewall, above the battery is the clutch master cylinder. DOT-3 brake fluid is the stuff. Notice too the color of the old fluid... If it is dark, and especially if there is some black flecks floating around or a black coating on the bottom of the reservoir, you'll want to purge the system.

Just a thought...

P.
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Old Aug 28, 2011 | 09:54 AM
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That is your headlight fluid resevior. Be careful, running it low can mess a lot of systems up.

Just kidding, agree with either master or clutch. Both take dot 3 so just fill it up!
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Old Aug 28, 2011 | 10:18 AM
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Originally Posted by matanki
The reservoir that I'm looking at is bolted to the firewall, and is a right above the battery.

Yep, blinker fluid goes in there. (Dot3/4)





Originally Posted by pkazsr
If it needs to be filled, where did the fluid go? Welcome to the Corvette world.
When mine let go about 5/6 years ago, all the fluid ended up in my brand-new capeting.
Last edited by mikeb; Aug 28, 2011 at 10:21 AM.
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Old Aug 28, 2011 | 10:41 AM
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Under the car. Don't worry about it put a shot glass of brake fluid in it and go on with it.
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Old Aug 29, 2011 | 02:45 AM
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Yup! That's the one! Thank you so very much! I will fill it tomorrow.

This is the best site for answers.......

Matanki
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Old Aug 30, 2011 | 10:30 AM
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Originally Posted by matanki
Yup! That's the one! Thank you so very much! I will fill it tomorrow. This is the best site for answers.......

Matanki
You really need to totally flush out and bleed the hydraulic clutch. Here is a How To write-up from the FSM.
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