Brake Booster Size - 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> Suspension - Brakes - Steering
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-04-2012, 12:29 PM
Registered User
 
Join Date: Jan 2012
Posts: 74
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Brake Booster Size

My '37 Dodge pickup body is mounted on an S10 2WD frame. The brakes are stock Disc/Drum with an aftermarket brake pedal assembly with a 1" bore Corvette style master and a 7" Dual booster, plus check valves F/R and a proportioning valve. The brakes work good but the pedal is a little heavy, I do have a small cam and getting about 15" vacuum at idle.

Would an 8" dual booster help?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-04-2012, 03:55 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by jayd_2 View Post
My '37 Dodge pickup body is mounted on an S10 2WD frame. The brakes are stock Disc/Drum with an aftermarket brake pedal assembly with a 1" bore Corvette style master and a 7" Dual booster, plus check valves F/R and a proportioning valve. The brakes work good but the pedal is a little heavy, I do have a small cam and getting about 15" vacuum at idle.

Would an 8" dual booster help?
I think the 7" dual diaphragm booster should be sufficient, but the larger booster will provide more pressure.

The 15 inches of vacuum is marginal, but in many cases- as long as you have at least that much- it's sufficient.

But before changing boosters or adding a vacuum pump (the vacuum reservoirs don't really help all that much IMHO), I would consider changing the pedal ratio and/or changing the ignition timing to add some more idle vacuum. This can be done by several methods, depending on whether you have a vacuum advance or not. But the basic idea is to increase the timing at idle, either by adding initial timing by advancing the distributor's position in the block then modifying the mechanical advance mechanism to give the correct total timing, or it might be as easy as changing the vacuum advance from ported to manifold vacuum then resetting the idle speed.

Often raising the idle speed a small amount will give a slight vacuum increase as well- especially in combination w/adding timing.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-04-2012, 04:07 PM
Registered User
 
Join Date: Jul 2012
Location: Franklin
Posts: 85
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
sounds like a pretty decent set up, with the 1" Corvette style master the pedal should feel stiff the 8" dual will relieve some of the stiffness and make it feel a little softer to a point however most s-10 chassis had a 7/8" bore on there master most had a 10" booster and a lot of the s-10 blazers had a dual metric one that was a little bigger than 8" in them "I know that's not your exact app. just trying to give you a little general knowledge"
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:
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 LBL Suspension - Brakes - Steering 36 05-07-2012 09:59 AM
Brake Booster Size jaymz Suspension - Brakes - Steering 1 03-29-2011 07:26 AM
brake booster ssonny34@yahoo.com Engine 2 07-17-2009 09:21 PM
brake booster size pigjamelectric Suspension - Brakes - Steering 3 05-08-2005 08:44 PM
brake booster gone? 73chevyhelp Suspension - Brakes - Steering 14 11-21-2004 01:00 AM


All times are GMT -6. The time now is 04:07 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.