Rear brake drag - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 09-16-2008, 12:08 AM
Registered User
Last photo:
Join Date: Aug 2007
Location: Las Vegas
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Rear brake drag

I am having an issue with the rear brakes on my 32 ford. It has a 1981 corvette rear with disc and the front is Mustang II disc. I have a 7" booster an adjustable proportioning valve and 2 Lb residual valves one for the front and one for the rear. The issue is that with the vacuum connected to the booster the rear brakes do not fully disengage they drag, if I disconnect the vacuum line and press the pedal once or twice the rear brakes fully release. The front brakes work fine either way. I have no idea why it does this and hope someone can give some suggestions as to what to check for. I have adjusted the proportioning valve fully in both directions and it has no effect. The only way to release the rear brakes is to remove the vacuum line.
I do not know how much vacuum the line has but the car has a large cam. I thought it may be the e-brake, so I disconnected it, no difference.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 09-16-2008, 01:06 AM
powerrodsmike's Avatar Moderator
Last wiki edit: Make a fiberglass fan shroud
Last journal entry: Next.. ..Bagging the king B (barge)
Last photo:
Join Date: Jan 2005
Location: gilroy, california
Age: 56
Posts: 4,104
Wiki Edits: 161

Thanks: 0
Thanked 3 Times in 3 Posts
Put a return spring on the pedal and make sure the pushrod is adjusted so it is just barely touching the master cylinder piston .Floor mounted pedals are notorious for not returning all the way. If everything is adjusted, and you have a pedal return spring installed already, then you may have a defective booster, it is supposed to fully retract when you let off the pedal. If the brakes will disengage when you pull the vacuum line off, that would indicate a defective air valve or sticky plunger.

Later, mikey
my signature lines...not really directed at anyone in particular..

BE different....ACT normal.

No one is completely useless..They can always be used as a bad example

Last edited by powerrodsmike; 09-16-2008 at 01:13 AM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-16-2008, 05:09 PM
Registered User
Last photo:
Join Date: Aug 2007
Location: Las Vegas
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The pedal returns all the way. I will try to troubleshoot the air valve and plunger.
Thanks for the info
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-20-2008, 08:46 AM
Registered User
Last photo:
Join Date: Aug 2007
Location: Las Vegas
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
rear brake drag fix

Well got it fixed. The rod between the booster and master was too long. I made it shorter by one turn and that fixed it.
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear disc brake ??? joe k Suspension - Brakes - Steering 5 04-14-2007 06:14 PM
Need 1990 Bronco II Rear Brake Help LarryA Suspension - Brakes - Steering 0 04-02-2007 08:38 PM
1968 Firebird Rear Disc Brake Conversion TORI1 Suspension - Brakes - Steering 3 07-21-2006 02:17 PM
84 camaro rear brake conversion Chevelle71 Suspension - Brakes - Steering 1 02-19-2004 04:06 AM
Hotrodders Knowledge Cluster: Disc Brake Conversions Jon Suspension - Brakes - Steering 0 08-29-2003 03:34 PM

All times are GMT -6. The time now is 12:11 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.