The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-23-2018, 06:46 PM   #1
mehoff400
Registered User
 
Join Date: Apr 2015
Location: Puyallup WA
Posts: 362
brake pressure

i recently swapped my 66 to cpp power brakes and calipers up front. i ran a few new lines to the front and rear. today was my first time really testing the truck out. all seemed good until after driving it for about an hour or so it seems i am loosing pedal pressure. I looked all around for leaks and what i do find is some fluid on top of the proportionate valve. i tighten it up the best i could but it didnt budge. should i use some type of teflon on this fitting? any other suggestions for things to look at.
__________________
66 c10 patina 250 T-5

My truck
mehoff400 is offline   Reply With Quote
Old 04-23-2018, 06:54 PM   #2
Ken Cook
Registered User
 
Ken Cook's Avatar
 
Join Date: Apr 2017
Location: Ragley, La.
Posts: 137
Re: brake pressure

I also just last weekend installed power front disc from CPP. I had to tighten the lines going into the proportionate valve 3 times. I think I finally got it to stop seeping there. I really thought I was about to twist it off.
The only real problem I had was a low pedal. It turned out to be air in the left rear line. It is working great now.
You should call them and see what they say. If mine shows signs of leaking any more I plan to call them.
Ken Cook is offline   Reply With Quote
Old 04-23-2018, 07:09 PM   #3
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,494
Re: brake pressure

Don’t use Teflon on it.
Sometimes you need to ‘mate’ the flare.
Tighten it a bit, loosen, tighten again, loosen and on and on. Might take several cycles. The action heats the flare slightly and the metal surfaces conform to each other.
geezer#99 is online now   Reply With Quote
Old 04-23-2018, 07:35 PM   #4
Cris
Registered User
 
Join Date: Aug 2016
Location: Los Altos Hills, California
Posts: 170
Re: brake pressure

Good advice from Geezer. I give it three cycles whenever I mate flares.
Cris is offline   Reply With Quote
Old 04-23-2018, 08:35 PM   #5
mehoff400
Registered User
 
Join Date: Apr 2015
Location: Puyallup WA
Posts: 362
Re: brake pressure

well after doing some more inspecting i found the rear reservoir completely empty. Looking at my rear lines i dont see anything that would say its losing fluid from. i tightened up where the rear hard line goes to the soft line at the frame as i replaced that and there was some sign of fluid there.
__________________
66 c10 patina 250 T-5

My truck
mehoff400 is offline   Reply With Quote
Old 04-23-2018, 09:10 PM   #6
The Rocknrod
Moderator

 
The Rocknrod's Avatar
 
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
Re: brake pressure

Quote:
Originally Posted by mehoff400 View Post
well after doing some more inspecting i found the rear reservoir completely empty. Looking at my rear lines i dont see anything that would say its losing fluid from. i tightened up where the rear hard line goes to the soft line at the frame as i replaced that and there was some sign of fluid there.
If the reservoir is empty you should also re-bleed that section.
The Rocknrod is offline   Reply With Quote
Old 04-23-2018, 09:20 PM   #7
mehoff400
Registered User
 
Join Date: Apr 2015
Location: Puyallup WA
Posts: 362
Re: brake pressure

Quote:
Originally Posted by The Rocknrod View Post
If the reservoir is empty you should also re-bleed that section.
yep, waiting for the wife to get home from work.
__________________
66 c10 patina 250 T-5

My truck
mehoff400 is offline   Reply With Quote
Old 04-23-2018, 09:22 PM   #8
rvrfoot
Registered User
 
Join Date: Oct 2016
Location: san bernardino ca
Posts: 1,611
Re: brake pressure

I have the same cpp. No problems here.Name:  DSCN0836.jpg
Views: 94
Size:  73.7 KB
rvrfoot is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 03:52 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com