Master cylinder - low fluid in rear reservoir? - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old Aug 3rd, 12, 05:50 AM Thread Starter
Senior Tech
 
Join Date: Sep 2004
Location: St. Charles, Illinois
Posts: 117
Master cylinder - low fluid in rear reservoir?

Having a strange problem with my master cylinder. Recently pulled my 69Z out of storage and found that the brake pedal was going to the floor. I pulled the cap off and found that the rear reservoir was near empty. The funny thing was that when I pulled the cap off a lot of fluid spilled over and out of the front reservoir, almost like the rear fluid was going into the front.

I do see a small drip line down the booster. But when I separate the master from the booster it seems dry so I don't think its coming out the back of the MC when I push the pedal. Wheels cylinders look dry and nothing visible on any of the brake lines running to the rear.

Proportioning valve???

-Darren
DarrenX33 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Aug 3rd, 12, 06:12 AM
Senior Tech
John
 
parkbrau's Avatar
 
Join Date: Sep 2004
Location: Germany
Posts: 6,296
Re: Master cylinder - low fluid in rear reservoir?

I'm just guessing here...But did you have the emergency brake on all the time? If yes, that may have forced fluid from the back reservoir to the front. Sounds like a MC rebuild would not hurt.

"I have just realized I have no idea how my papers are treated at State. Who manages both my personal and official files? ... I think we need to get on this asap to be sure we know and design the system we want."
parkbrau is offline  
post #3 of 8 (permalink) Old Aug 3rd, 12, 07:12 AM Thread Starter
Senior Tech
 
Join Date: Sep 2004
Location: St. Charles, Illinois
Posts: 117
Re: Master cylinder - low fluid in rear reservoir?

I topped it off and drove it around town and it proceeded to empty again.

When I restored my car in the early 90's I sent the master out to be re-sleeved. I wasn't thinking I needed it again. But maybe?

-Darren

Last edited by DarrenX33; Aug 3rd, 12 at 07:27 AM.
DarrenX33 is offline  
post #4 of 8 (permalink) Old Aug 3rd, 12, 08:29 AM
Senior Tech
John
 
parkbrau's Avatar
 
Join Date: Sep 2004
Location: Germany
Posts: 6,296
Re: Master cylinder - low fluid in rear reservoir?

Then you have to be able to see where the fluid is dripping or leaking from if its that noticeable.

"I have just realized I have no idea how my papers are treated at State. Who manages both my personal and official files? ... I think we need to get on this asap to be sure we know and design the system we want."
parkbrau is offline  
post #5 of 8 (permalink) Old Aug 3rd, 12, 10:48 AM Thread Starter
Senior Tech
 
Join Date: Sep 2004
Location: St. Charles, Illinois
Posts: 117
Re: Master cylinder - low fluid in rear reservoir?

Quote:
Originally Posted by parkbrau View Post
Then you have to be able to see where the fluid is dripping or leaking from if its that noticeable.
I agree. One would think but nada.

-Darren
DarrenX33 is offline  
post #6 of 8 (permalink) Old Aug 3rd, 12, 11:10 AM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,704
Wink Re: Master cylinder - low fluid in rear reservoir?

If the fluid is transferring from the 'rear' reservoir to the 'front' - then the problem is internal to the Master cylinder
The secondary cup seal(s) have been damaged or failed ...

Rebuild/replace the master.

1968 Convertible
Some trucks
Other V8 things - some of which float
Other V6 things - none of which float
Oh yeah, and 1 "Straight-Six" ...

If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
Vintage 68 is offline  
post #7 of 8 (permalink) Old Aug 3rd, 12, 02:27 PM
Senior Tech
Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,315
Re: Master cylinder - low fluid in rear reservoir?

How long has the car been sitting... storage is bad on brake seals...MC and wheels.
Have seepage marks down the booster but no signs behind the MC seals....
Check inside the booster for fliud... it may need emting of brake fliud.

Is there air when u bleed the brakes?
Does sound like what John above describes.. replace rebuil MC, and caution with calipar and slave seals... storage, plus extra pressure from a new MC usually blows those over the next couple 1000 miles to.
Steptoe is offline  
post #8 of 8 (permalink) Old Aug 3rd, 12, 08:28 PM Thread Starter
Senior Tech
 
Join Date: Sep 2004
Location: St. Charles, Illinois
Posts: 117
Re: Master cylinder - low fluid in rear reservoir?

Hardcore storage since last November. It's usually out by april but I needed it in 3 mos longer than usual. I'll check into those things.

-Darren
DarrenX33 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome