C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Where did my brake fluid go?

Thread Tools
 
Search this Thread
 
Old Apr 27, 2017 | 07:28 PM
  #1  
74 vert's Avatar
74 vert
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2003
Posts: 2,165
Likes: 8
From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
Default Where did my brake fluid go?

Willwood master cylinder drained
Booster after removing master cylinder
MC removed
Underside of MC rod
I checked all calipers and didn't notice any fluids. The car has been sitting in garage for about a year and half. I do start it every 4 to 5 months. The willwood MC aND calipers have been on the car about 7 years.

Last edited by 74 vert; Apr 27, 2017 at 07:29 PM.
Reply
Old Apr 27, 2017 | 07:44 PM
  #2  
BlackC3vette's Avatar
BlackC3vette
Burning Brakes
10 Year Member
 
Joined: Jan 2012
Posts: 943
Likes: 73
Default

From the photos, it looks like the rear (secondary) seal in the master was leaking.
Reply
Old Apr 27, 2017 | 07:56 PM
  #3  
CanadaGrant's Avatar
CanadaGrant
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2006
Posts: 4,057
Likes: 421
From: BC
Default

Since the rod is wet behind and in front of the seal it looks to me that the fluid leaked past not only the master cylinder seal but also the booster seal. I bet your fluid has formed a small lake inside the bottom of your booster.
Reply
Old Apr 27, 2017 | 08:16 PM
  #4  
Rescue Rogers's Avatar
Rescue Rogers
Is my vette stock?? HAHA
Supporting Lifetime Gold
Veteran: Navy
10 Year Member
Community Builder
Loved
 
Joined: Oct 2015
Posts: 20,259
Likes: 9,397
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Default

That would be my guess, take out the vacuum grommet and stick a probe down in there, it'll come back wet possibly
Reply
Old Apr 27, 2017 | 08:19 PM
  #5  
sunflower 1972's Avatar
sunflower 1972
Melting Slicks
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Sep 2016
Posts: 2,238
Likes: 989
From: Wauconda IL
Default

Or, it's possible that it went out the tail pipes due to the fluid being sucked into the VACUUM booster.
Reply
Old Apr 27, 2017 | 09:25 PM
  #6  
BlackC3vette's Avatar
BlackC3vette
Burning Brakes
10 Year Member
 
Joined: Jan 2012
Posts: 943
Likes: 73
Default

Put a vacuum pump on the booster check valve and pump it to 15 to 20 in. of vacuum. Let it sit for awhile and see if it holds pressure.
Reply
Old Apr 28, 2017 | 08:22 AM
  #7  
mrvette's Avatar
mrvette
Team Owner
Active Streak: 120 Days
Liked
Loved
Community Favorite
 
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Default

In the pix, the M cylinder end piston area looks too clean, like it was new, so I would be examining the brake lines really good, and one of my mystery leaks came down to that silly valve with the wire on it, nothing but an alarm switch that light a lite to tell you one of the brake circuits has no pressure.....woopie doo, as if a driver can't tell that from the feel of the way the car reacts......My brake switch was replaced with a simple splitter block for the front, and the rear line run straight to the m/cylinder....no more mystery fluid loss......I wish I had all that Wilwood brakes set up on my car....love to find a used set for the front....

that is a HINT, anyone......

Reply
Old May 9, 2017 | 09:57 PM
  #8  
74 vert's Avatar
74 vert
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2003
Posts: 2,165
Likes: 8
From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
Default Back on the road

After some gravity bleeding of four calipers still noticed contamination in rear of mc
Got this from harbor freight. Bled about a quart and achieved peddle!! Runs with compressor to pull fluid through the lines.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

 Michael S. Palmer
story-1

5 Best & 5 Worst Corvette Daily Drivers

 Joe Kucinski
story-2

The Headlights of Every Corvette Generation Explained

 Joe Kucinski
story-3

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-4

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-5

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-6

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-7

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-8

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-9

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
Old May 10, 2017 | 10:49 PM
  #9  
Rescue Rogers's Avatar
Rescue Rogers
Is my vette stock?? HAHA
Supporting Lifetime Gold
Veteran: Navy
10 Year Member
Community Builder
Loved
 
Joined: Oct 2015
Posts: 20,259
Likes: 9,397
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Default

what is it called. I have never seen that before. Very nice and clean
Reply

Get notified of new replies

To Where did my brake fluid go?





All times are GMT -4. The time now is 08:21 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE