no brakes with vacuum to the booster - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



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

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-15-2011, 11:55 AM
harryx's Avatar
Registered User
 
Last photo:
Join Date: Jun 2011
Location: Dunedin, Florida
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
no brakes with vacuum to the booster

My brake pedal went to the floor with no resistance. When I turned the truck off, I had brakes again. The fluid level is fine in the master cylinder. I disconnected the vacuum going to the booster and now I can drive again. It certainly appears the booster is bad and I will replace it, but is this a normal symtom of a bad booster? I did try to connect the vacuum hose later and got the same problem, brake pedal to the floor.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-15-2011, 04:54 PM
LATECH's Avatar
Hotrodders.com Moderator
 

Last journal entry: Motor - vator
Last photo:
Join Date: Jul 2010
Location: Northeast Pennsylvania
Posts: 5,066
Wiki Edits: 0

Thanks: 190
Thanked 239 Times in 222 Posts
So are you saying you have driven the truck and the brakes will stop it?
The pedal should not go to the floor... running engine or not. If it does with the engine running maybe the master is bad and it just feels like you have brakes with the engine off when the booster looses power to assist. Something doesnt makes sense here.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-15-2011, 05:07 PM
bigdog7373's Avatar
Of course it's fast
 
Last photo:
Join Date: May 2010
Location: florida
Posts: 2,673
Wiki Edits: 0

Thanks: 13
Thanked 48 Times in 48 Posts
If you are having problems with the brakes then stop driving the truck! Get it fixed and working first. No need to risk your life for a brake booster.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-15-2011, 05:41 PM
harryx's Avatar
Registered User
 
Last photo:
Join Date: Jun 2011
Location: Dunedin, Florida
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
more problems

First, I am not driving around with this problem. I am testing the brakes in my driveway. The brake pedal is now going to the floor without the vacuum line. If I pump the pedal for awhile it starts to get stiff, but if I start the car with the vacuum line connected it goes right to the floor. I think I need to first bleed the brakes, and hope the master cyclinder is not bad.

Now, I don't think the problem is with the booster.
Thank you for the replies.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-09-2011, 06:35 PM
harryx's Avatar
Registered User
 
Last photo:
Join Date: Jun 2011
Location: Dunedin, Florida
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Brakes are fixed

I replaced the master cylinder and I still had the problem with the pedal going to the floor when the truck was running. I then replaced the after-market pancake style brake booster with a re-conditioned 1974 Corvette booster. and my problem was solved. I can't believe a booster not holding vacuum can cause such a severe problem.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-09-2011, 10:01 PM
fast68's Avatar
likes chevy trucks & boobies
 
Last photo:
Join Date: Oct 2005
Location: IL
Posts: 1,970
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
yep, its because it was ruptured internally and vacuum was on wrong side of it internally, working against your foot pressure

most boosters are hard as a rock when failed/ruptured,

makes perfect sense


it failed

have fun!
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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

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
Brake booster vacuum leak 70 ElCam Suspension - Brakes - Steering 11 10-03-2010 11:30 PM
Where did this power booster get its vacuum? K and K Engine 9 08-14-2010 01:02 PM
replace power brakes vacuum booster leprechaun Suspension - Brakes - Steering 1 08-14-2009 07:10 PM
vacuum booster is it working Ed ke6bnl Suspension - Brakes - Steering 2 10-15-2004 04:39 AM
vacuum brake booster 48Man Suspension - Brakes - Steering 1 01-14-2003 06:10 AM


All times are GMT -6. The time now is 06:15 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.