brake porportating valve - Page 2 - 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
  #16 (permalink)  
Old 01-26-2008, 02:29 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 1 Time in 1 Post
I'll just add my two cents, although mikey has it pretty nailed:

I disagree somewhat with not needing a proportioning valve for disc/disc. First of all, there is no guarantee that the front brakes offer the same braking torque as the rears. If we're mixing and matching master cylinders, brakes, and everything else, the chances that they'll be right without a prop valve are very slim. In a 50/50 weight bias car, I like to see 70/30 front/rear brake bias. That is actual braking torque, not pressure. The actual pressures you need to send to those brakes might be 80/20 or 65/35 depending on how much brake torque the brakes you've chosen provide.

The brake delay incorporated with prop valves is a nice addition, but its more of a dumb driver safety thing. It will help an inexperienced driver in a panic stop, but for most purposes its not required in my opinion.

As far as aluminum, don't use it at all. Its an absolute no-no for lines. Aluminum tubing is usually rated around 300-500 psi, but brakes can easily approach 2000 psi. For fittings, I say avoid them. Some have done it and been successful, but on our race car we temporarily fixed one with an aluminum fitting and it ripped the threads right out of the fitting on the third turn.

Don't use brass either. I've done it before and it hasn't let me down, but its not DOT legal. The big thick brass unions and tees are usually OK, but make sure the tube nuts are steel or stainless.

Othewise, AN fittings are great for this kind of thing. Make sure you do the actual flare; never use compression fittings or slip-ons of any kind. But a 37* AN flare is just as good (if not better) than a double flare 45.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 01-26-2008, 03:15 PM
powerrodsmike's Avatar
Hotrodders.com 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: 53
Posts: 4,108
Wiki Edits: 161

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by curtis73
Some have done it and been successful, but on our race car we temporarily fixed one with an aluminum fitting and it ripped the threads right out of the fitting on the third turn.
I popped the top off of an alum AN tube nut one time tightening it ....

I also don't like using aluminum fittings with SS tube because besides Al being much weaker, it is cheesy looking next to the SS.


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
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 01-30-2008, 02:36 PM
Stovebolter's Avatar
36 Chevy Low Cab
 

Last journal entry: C4 IRS
Last photo:
Join Date: Dec 2007
Location: Harrison, AR
Age: 45
Posts: 332
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks to both of you. I ordered stainless steel line, steel/zinc plated fittings, stainless booster and the au master cylinder (with build in p.v.) from Speedway. The master/booster price wasnt much more than a standard corvette master cyclinder. Well....a benjamin more. I couldnt resist. My wife is going to kill me. LOL's. I ordered the steel sleeves/nuts from Summit.

Mikey, I chickened out on putting it all inside the frame rails. Too much confusion for this guy. I would have to come out of the frame anyway to get to the front right because the crossmember had a solid plate on the ends and no way to fasten it inside the 4X4 box tubing. Oh well.

Again...Thanks!

Dave
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
Ford Galaxie Disc Brake Conversion CrashFarmer2 Suspension - Brakes - Steering 5 04-10-2010 04:52 PM
Valve Lash adjustment hiball Engine 36 05-11-2009 10:12 AM
brake combo valve electrical connector dawg Suspension - Brakes - Steering 9 01-21-2007 06:39 PM
brake booster check valve ? Vortech 4.3 Engine 3 04-08-2006 10:34 AM
Looking for a deal on power Brake booster,with pedal&combo valve for willys Harry Hut Interior 0 04-02-2002 01:36 PM


All times are GMT -6. The time now is 11:38 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.