Disc brake change on 57 chevy - 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 03-05-2009, 11:31 PM
Registered User
 
Join Date: Apr 2008
Location: stonewall okla
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Disc brake change on 57 chevy

I installed Disc brakes (power) on the front of my 57 chevy and have been unable to get them working. I have bled them and still no pedal. After bleeding them 4 times still only had a small amount of fluid coming out when bleeding. Every thing is new including rear wheel cyl and all brake lines. Still no pedal. Anybody got a solution?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-06-2009, 06:28 AM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,837
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
Give us some more information as to what you have.

GM calipers?
Dual master cylinder?
Power or not?

Vince
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-06-2009, 08:06 PM
Registered User
 
Join Date: Apr 2008
Location: stonewall okla
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Disc brake change on 57 chevy

dual master cyl and it is power disc brakes on front and drum on rear. Metric master and booster with proportinal valve from 80 gm product
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-06-2009, 08:57 PM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,762
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Does it have a distribution block on it?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-06-2009, 09:13 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 3 Times in 3 Posts
Quote:
Originally Posted by cecil13
dual master cyl and it is power disc brakes on front and drum on rear. Metric master and booster with proportinal valve from 80 gm product
Is this a new proportioning valve or a used one? The metering valve and rear prop valve in those combination valves go bad sometimes. .
Are the calipers early GM? Those have larger pistons than the metric calipers and sometimes need a bigger master cylinder, 1 1/8" bore is real common. Some disc brake conversions use those calipers.
Is the pushrod adjusted correctly? If there is no freeplay at the pedal when the brakes are released, the seals will block off the transfer ports, and you'll get no flow. Also, if the car was originally a manual brake car, and you converted to a power brake setup, the pedal ratio will need to be changed to a power ratio.

Power ratio is 4:1 to 6:1, while a manual brake setup is 6:1 or 7:1 or more.

When you plumbed the brakes, did you split the front/rear systems and plumb them to the appropriate outlets on the combination valve?

Later, 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
  #6 (permalink)  
Old 03-06-2009, 09:35 PM
Registered User
 
Join Date: Apr 2008
Location: stonewall okla
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Disc brake change on 57 chevy

Calipers are rebuilt from 80's gm. Push rod has free play. I pushed the rod to booster in far as it would go and hooked it to brake pedal. I get all kinds of fluid to the front and rear. I just can't get it to build any pedal. If I pump the brake pedal three or four times and it will hold car from moving. If I give it any gas it will not hold very good. The rear brake line is hook up to the rear of the valve and the right front is hooked to the front of valve and left front is hooked up under valve toward the front. Benched bled master and bled lines at master and block. I also check the valve with a test light and it shows to be working right.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-06-2009, 10:40 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 3 Times in 3 Posts
OK so you have the smaller piston metric calipers..How much travel do you have at the pushrod from the pedal up position to the bottom of the pedal stroke, when the pedal hits the floor?

Those master cylinders will allow at least 1.1 inches of pushrod travel. Add another 1/16" or so for the booster. A properly set up system will lock the brakes at about 5/8-3/4 of pushrod travel. You said you pushed the pushrod in as far as it would go and then hooked up the pedal. The pushrod should be in the full out position when the pedal is relaxed. You should not have to push in at all to hook it up.

You said in your first post you got only a small amount of fluid from the bleeders. I will assume that you are closing the bleeder valve before you let the pedal up when you are bleeding the brakes.

You say that now you are getting lots of fluid at the bleeders. If you are getting plenty of fluid at the bleeders, then chances are the good that the combination valve is good.
Testing the combination valve with a light only tells you if the valve is centered, but will not tell you if the metering valve or rear proportioning valve section is blocked .

Later, 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
  #8 (permalink)  
Old 03-09-2009, 01:28 AM
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
howdy there!

what model spindles are you using?
and tie rods and so forth ?
G body? B body ?
F body? A body ?
80s style right ?

application of ball joints needed to do it ?

stock 57 control arms ?

or?



curious because we will need to disc brake the 57 bel air some day when we are ready to put the stock unmolested rolling chassis from the parts 4 door 57 under it

thanks!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 03-17-2009, 08:14 PM
Registered User
 
Join Date: Apr 2008
Location: stonewall okla
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
57 chev

I used the 57 chevy parts except for rotors 68-72 Chevelle was what I used.
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
Hotrodders Knowledge Cluster: Disc Brake Conversions Jon Suspension - Brakes - Steering 0 08-29-2003 03:34 PM
Brake Booster kit for 57 Chevy JoeS Suspension - Brakes - Steering 1 03-09-2003 10:57 AM
'57 bel air disc brake conversion mitmaks Suspension - Brakes - Steering 1 12-20-2002 07:22 PM
57 DISC BRAKE CONVERSION ugos Suspension - Brakes - Steering 1 10-25-2002 03:08 PM


All times are GMT -6. The time now is 06:39 PM.


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.