Brought to you in part by:

.

Tools & Supplies by Eastwood

  Mustangsandmore Forums
  '64 1/2 to '73 -- The Classic Mustang
  Porportioning valve question

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   Porportioning valve question
Gary
Gearhead

Posts: 700
From: Sarasota, Fla. USA
Registered: Jun 99

posted 11-29-2001 07:30 PM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
The one and only thing on the brake system I have not replaced is the porportioning valve.
Just what does this valve do??? I cleaned it up earlier and re-installed it. Im getting plenlty of fuild out of all four bleeders, in fact I have run a quart of brake fuild through the whole system but still have no brakes..only a tad but very weak. System just does not build any hyd pressure and there's no leaks..im confused..Iv'e done many brake jobs before with no problems. Thought Id ask again and question the valve as to what it does before committing to the dualting task of removing the master again and trying the old new one. With the 528BB sitting close by it's not an easy task even when removing the rocker to sneak the master by.
Another question: In building this car I had everything apart, in relation to the proportioning valve, is it possible to install this valve in the line in the wrong direction? or is it directional? Im getting plently of brake fuild throughout the system.
Just a thought..humm?

[This message has been edited by Gary (edited 11-29-2001).]

[This message has been edited by Gary (edited 11-29-2001).]

[This message has been edited by Gary (edited 11-29-2001).]

IP: Logged

kcode
Gearhead

Posts: 2099
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 11-29-2001 10:46 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
Gary,
I assume that you are still using the stock non-adjustable prop valve inline, If you are, my opinion would be to get rid of it and go with an adjustable type. This way you can dial in the best bias to match your tire and brake combination. About $40, if you go with Summitt brand, Wilwood cost more.

Did you change size or style of master cylinder when you built the car, or style of brakes?

Mike

IP: Logged

franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 11-29-2001 11:00 PM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
The proportioning valve is used to delay the action of the rear brakes during a panic stop to keep the rear brakes from locking up and causing the car to spin out. They are usually made for specific model cars because of the different weight bias front to rear. That's what would be good about kcode's suggestion about getting an aftermarket adjustable one, since you have modified your car so much anyway.
Also I have noticed alot of cars have the front brakes hooked to the rear section of the mc and the rear brakes hooked to the front section of the mc. Is this the way you have yours hooked up? I am assuming you have front discs, so you definitely need a mc that is designed for front discs/rear drum, or front discs/ rear disc if you have them.

IP: Logged

Gary
Gearhead

Posts: 700
From: Sarasota, Fla. USA
Registered: Jun 99

posted 11-29-2001 11:07 PM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
Kcode, I retained the stock type brakes, disc front drums rear. Im planning on converting to disc in the rear here soon. Thanks for the info about adjustable valve, thats sounds like a good idea. The only changes I did were to convert to DOT 5 silicone and use premium pads. The wildwood stuff would be nice, huge disc all the way around is what I wanted to do but funds in the begining went into building the engine and 4-link suspension ect. Figured doing better brakes could wait just alittle later.
Brakes really are on top of my list to do now that the car is 95% finished. Speed is nice but stopping it safely is even better

IP: Logged

Gary
Gearhead

Posts: 700
From: Sarasota, Fla. USA
Registered: Jun 99

posted 11-29-2001 11:12 PM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
Franklin, Yes, front disc line to rear of MC drums rear connected to front of MC. That is correct I beleive...

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2002, Steve LaRiviere


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[About M&M][Acronym Guide][Calendar of Events][Chat Room][Classified Ads] [Links]

[Members' Photos] [M&M Mug Shots] [Technical Articles][Ford Parts Number Deciphering

[ Mustangsandmore.com Bookstore] [Advertise on Mustangsandmore.com] [Mustangsandmore.com T-Shirts]