Master Cylinder one chamber empty - 1969 LeMans - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 09-24-2010, 10:42 AM Thread Starter
 
Join Date: Sep 2010
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Master Cylinder one chamber empty - 1969 LeMans

Hello,
I was replacing the master cylinder cap (with a new chrome one) when I noticed that the forward chamber of the cylinder had almost no fluid in it, while the rear chamber (closest to the firewall) was almost overflowing.
Is that normal?
It is a drum/drum no-assist brake system.
I only had the car for a few weeks. Still trying to figure things out...
Thanks
costucu is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 09-24-2010, 12:33 PM
 
Join Date: Nov 2009
Posts: 475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by costucu View Post
Hello,
I was replacing the master cylinder cap (with a new chrome one) when I noticed that the forward chamber of the cylinder had almost no fluid in it, while the rear chamber (closest to the firewall) was almost overflowing.
Is that normal?
It is a drum/drum no-assist brake system.
I only had the car for a few weeks. Still trying to figure things out...
Thanks
no. refill it and see if there are any leaks. one chamber goes to the front and one goes to the back.
freethinker is offline  
post #3 of 7 (permalink) Old 09-24-2010, 01:25 PM
Administrator
 
05GTO's Avatar
 
Join Date: Oct 2004
Location: Deliverance, GA
Posts: 5,012
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by freethinker View Post
no. refill it and see if there are any leaks. one chamber goes to the front and one goes to the back.


Check the rubber hoses going to the front brakes,

Randy


05GTO is offline  
post #4 of 7 (permalink) Old 09-24-2010, 01:34 PM
 
Jeff's Classics's Avatar
 
Join Date: Feb 2010
Location: Cypress, TX
Posts: 160
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've also seen master cylinders leak down the firewall, check for oilyness and/or peeling paint below the MC. Could be a leaking wheel cylinder or brake hose, as already mentioned.

'68 GTO, 400/TH400, AC/PS/PB/PW, hideaways, Hurst dual gate
'72 442 'Vert, 350/TH350, AC/PS/PB/PW
'74 Corvette, 383/4-speed, 450 hp, restomod
'71 Javelin, 304/3-speed
'70 Cougar XR7 'Vert, 351W/FMX auto *SOLD*
Jeff's Classics is offline  
post #5 of 7 (permalink) Old 09-24-2010, 01:45 PM
 
Join Date: Oct 2009
Location: NorCal
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the same thing recently happened to me, turned out to be a bleeder screw that somehow popped and leaked all the front resevoir fluid dry.

but that front resevoir pushes the front brakes, so definitely don't drive it with no fluid or soon you wont be able to stop!
GroundHog is offline  
post #6 of 7 (permalink) Old 09-24-2010, 03:36 PM
 
jetstang's Avatar
 
Join Date: Nov 2008
Location: Niceville, FL
Posts: 3,379
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Look for wetness on the inside of the tires, the one that is streaky wet has the bad wheel cylinder. If it was leaking out the back of the master cylinderr, the rear resevoir would be empty, not the front. If you can't find the leak, fill it up and pump the brakes and look for the wet spot. Wheel cylinders blow all the time, they are under $20 a piece for new ones, I don't rebuild them at all anymore.

Burning rubber since 1982!!
My photobucket, lots of dif car pics.
http://s411.photobucket.com/home/jetstang
jetstang is offline  
post #7 of 7 (permalink) Old 09-25-2010, 09:26 AM
 
67HOGOAT's Avatar
 
Join Date: Dec 2008
Location: VA
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Had the same problem on a 66 Vette. Had to rebuild the master cylinder, the seals were bad. If no other leaks, may be the same problem.
Alex
67HOGOAT is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum 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 for yourself.

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1970 power brake master cylinder skyman51 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 0 06-17-2010 05:26 AM
Switch master cylinder Richtenb Drive train, suspension, alignment and brakes. 1 04-15-2010 04:57 AM
master cylinder question 66tempestGT 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 5 04-12-2010 07:35 AM
new master cylinder, rear brakes not working BlueMonkey 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 7 10-21-2009 09:27 AM
Brake Master cylinder replacement. Musicmike927 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 1 05-24-2009 06:57 AM

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