Dragging rear brakes - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



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

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-28-2018, 05:22 AM
Registered User
 
Join Date: Mar 2008
Location: Ohio
Posts: 45
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Dragging rear brakes

I have four wheel disc brakes on my 70 Mustang and it seems like the rear brakes are dragging.
I installed a new Wilwood master cylinder and adjustable proportioning valve.
I have checked my master cylinder pushrod several times so I am pretty sure it is correct.
If I filled my master cylinder with to much brake fluid would that cause the brakes to drag?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-23-2018, 09:58 PM
Member
 
Join Date: Dec 2004
Location: ohio
Age: 72
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 138 Times in 121 Posts
If I filled my master cylinder with to much brake fluid would that cause the brakes to drag?


No. Are your brakes boosted? Do you have a disc/disc master cylinder? If you have a disc/drum master cylinder than can cause brake drag.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-24-2018, 05:00 AM
Registered User
 
Join Date: Mar 2008
Location: Ohio
Posts: 45
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
No the brakes are manual not power.

I do have a disc/disc 15/16" bore Wilwood master cylinder.

I readjusted the brake pedal pushrod again and it is marginally better. Took the car on a 500 mile round trip right after July 4th no problems. But last weekend went about 15 miles and the right rear was dragging when i backed up.
Reply With Quote Quick reply to this message
 
  #4 (permalink)  
Old 07-24-2018, 05:02 AM
Registered User
 
Join Date: Mar 2008
Location: Ohio
Posts: 45
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Rose_419

Ebrake is not hooked up.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-24-2018, 06:31 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Join Date: Jul 2002
Location: Columbia, Mo
Age: 43
Posts: 6,948
Wiki Edits: 0

Thanks: 105
Thanked 709 Times in 583 Posts
Sounds like the hardware isn't pulling the shoes away or holding the shoes from the drum.
A failing softline is a common issue with that symptom too. Usually it's worse after a hard brake episode.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-24-2018, 09:00 AM
PHWOARchild's Avatar
Registered User
 
Join Date: Dec 2015
Posts: 983
Wiki Edits: 0

Thanks: 111
Thanked 143 Times in 135 Posts
Modern rear-disc brakes depend on the use of the parking brake once in a while to keep everything moving. I would look for a sticky caliper first, also the rear hose as mentioned earlier. Lube any metal-to-metal surfaces with a high temp white grease.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-24-2018, 09:01 AM
Registered User
 
Join Date: Mar 2008
Location: Ohio
Posts: 45
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I have four wheel disc brakes on the car
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-24-2018, 10:39 AM
Registered User
 
Join Date: Dec 2013
Location: VT
Posts: 689
Wiki Edits: 0

Thanks: 1
Thanked 131 Times in 100 Posts
Check the flexible rubber brake hose that goes to the rear end. Sometimes the ID of the hose swells shut. Under brake pressure, fluid gets through the hose, when releasing the brakes, the fluid doesn't return to the master cylinder. This effectively keeps the brakes on. Disconnect both ends of the hose and try to blow air through it. If you have trouble getting air through it, replace the hose.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-24-2018, 11:11 AM
PHWOARchild's Avatar
Registered User
 
Join Date: Dec 2015
Posts: 983
Wiki Edits: 0

Thanks: 111
Thanked 143 Times in 135 Posts
Quote:
Originally Posted by '48 Austin View Post
Check the flexible rubber brake hose that goes to the rear end. Sometimes the ID of the hose swells shut. Under brake pressure, fluid gets through the hose, when releasing the brakes, the fluid doesn't return to the master cylinder. This effectively keeps the brakes on. Disconnect both ends of the hose and try to blow air through it. If you have trouble getting air through it, replace the hose.

And they look perfectly fine on the outside most of the time. I had one in a customer's GM car years back, had to dissect the hose to find the restriction.
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply
Message:
Options

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:
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:
Insurance
Please select your insurance company (Optional)

Log-in



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
Front Disc Brakes Dragging jayd_2 Suspension - Brakes - Steering 12 04-15-2013 12:31 PM
Dragging Brakes Bad 57 Suspension - Brakes - Steering 9 01-12-2012 02:13 PM
Dragging brakes? FrankR Suspension - Brakes - Steering 2 12-06-2005 09:20 PM
76 Monte whose "A_ _ is dragging bigjoedo Suspension - Brakes - Steering 8 05-19-2003 08:21 PM
Anti-lock rear brake dragging Hotrod Rudy Suspension - Brakes - Steering 5 03-15-2003 11:28 AM


All times are GMT -6. The time now is 07:02 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, 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 © 2019 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.