Brake Problems on a 71 Mach 1 - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Classic Mustangs



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 03-21-2009, 07:25 AM   #1
Registered User
Newbie
 
Join Date: Mar 2009
Region: West Virgina
Posts: 12
Brake Problems on a 71 Mach 1

My rear brakes are not getting any fluid. The front work fine, I bled them and everythings works, so I am assuming the proportioning valve is okay. When I hit the brakes the front resevoir bubbles but when I disconnected the brake line into the rear axle no fluid is present. Any help would be appreciated. Oh yeah, it has power brakes and I have tested it with the engine off.

Thanks
John
71 Mach 1 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-16-2009, 12:10 PM   #2
Registered Member
Regular
 
Mil1ion's Avatar
 
Join Date: Feb 2009
Region: Canada
Posts: 22
Send a message via Yahoo to Mil1ion Send a message via Skype™ to Mil1ion
Re: Brake Problems on a 71 Mach 1

Has the car been sitting doing nothing for any length of time ?
__________________
My name is Dennis and I approve this message.
Mil1ion is offline   Reply With Quote
Old 04-16-2009, 12:22 PM   #3
Registered User
Newbie
 
Join Date: Mar 2009
Region: West Virgina
Posts: 12
Re: Brake Problems on a 71 Mach 1

yes, for at least 4 years.
71 Mach 1 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-16-2009, 03:13 PM   #4
Registered Member
Regular
 
SaleenFiend's Avatar
 
Join Date: Jul 2008
Location: Louisiana
Region: Louisiana
Posts: 2,318
Re: Brake Problems on a 71 Mach 1

I would check all of the lines to make sure nothing is leaking when going toward the rear. You have a pretty wide spectrum here and I would start with the process of elimination.

Correctly bleed master cylinder: Pull The lines off of the master cylinder and fill the reservoir. Plug one hole in the cylinder with your finger (may need an extra pair of hands to help) and bleed one hole at a time just like you would the brakes until fluid is coming out. Once you have fluid out of the front hole hook up the line. Do the same for the next hole.
If you are able to bleed the master cylinder then it is O.K.

Then follow the lines throughout the vehicle as you check for leaks or clogs. I would remove the lines from the Proportioning Valve and bleed as you did the master cylinder just to check its operation.

I'm no expert on this but I would assume you would want to check all the lines at every point possible to eliminate the area of blockage or failed parts.
SaleenFiend is offline   Reply With Quote
Old 04-16-2009, 03:59 PM   #5
Registered User
Newbie
 
Join Date: Mar 2009
Region: West Virgina
Posts: 12
Re: Brake Problems on a 71 Mach 1

Thank a lot for the suggestions, I have bled the front discs and they are fine. I replaced most of the rear lines (except the one that runs the length of the car). I think my problem may be with the "plunger" that is set every time the brake light goes on during start-up.
71 Mach 1 is offline   Reply With Quote
Old 04-18-2009, 04:19 PM   #6
Registered Member
Regular
 
Mil1ion's Avatar
 
Join Date: Feb 2009
Region: Canada
Posts: 22
Send a message via Yahoo to Mil1ion Send a message via Skype™ to Mil1ion
Re: Brake Problems on a 71 Mach 1

Because brake fluid absorbs moisture and the car has sat.. IMO, you need to remove the proportioning valve and clean it out or replace it because it has probably has rusted inside.

This is a common theme for cars that sit in a somewhat humid condition.


__________________
My name is Dennis and I approve this message.
Mil1ion is offline   Reply With Quote
Old 04-18-2009, 07:54 PM   #7
Registered User
Newbie
 
Join Date: Mar 2009
Region: West Virgina
Posts: 12
Re: Brake Problems on a 71 Mach 1

Thanks, that is a good idea, I think I will pull the valve and clean it thorroughly.
71 Mach 1 is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Classic Mustangs

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
99 35th. ann. GT brake problems !! HELP!! plz j4gwig 1996-2004 Mustang GT 6 06-22-2010 06:28 PM
Brake problems 67mustang97 1996-2004 Mustang GT 4 04-06-2010 07:39 PM
Brake Problems LSUstang Pre-2005 V6 Mustang 9 06-20-2009 06:21 PM
V6 Mustang Brake Booster Problems Brent Pre-2005 V6 Mustang 24 11-05-2007 09:38 PM
mach 1 grille delete problems charkelly9 Mustang Audio & Video 18 08-19-2005 02:25 PM

» Like Us On Facebook



10:38 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.