1972 K-10 Odd Brake Problem - C10Trucks.com
C10Trucks.com  
It shows that you are unregistered, or not logged in to The Forum. Please register with us by clicking Here

Click here to Join C10Trucks , Membership is Totally Free

How to make your first post on C10trucks.com Click Here.


Go Back   C10Trucks.com > 1st - 2nd and 3rd & 4th Generation Chevy C10 Trucks > K/ Series Chevy Trucks

K/ Series Chevy Trucks K/ Series Chevy Trucks


Click here for C10 Truck Parts for sale on ebay

Reply
 
Thread Tools Display Modes
  #1  
Old 01-17-2020, 06:38 PM
Jerryl W. Jerryl W. is offline
Junior Member
 
Join Date: Jan 2020
Location: Texas
Posts: 4
Default 1972 K-10 Odd Brake Problem

Hello,
I have owned my 72 K-10 for approx. 30 years and actually used it for my primary work vehicle for 16 years straight..... and without adequate brakes. I have spent approx. $15,000 over the years trying to fix my brake problem. I just spent $2,600. last week totally reworking the brake system again with all new parts front & back....with the exception of the original steel lines which had good flow. These were top notch mechanics that studied this truck for two weeks and they thought they could fix it and still no brakes.
Every mechanic including my self says the same thing about the hard pedal and lack of stopping power......its a bad m.cylinder/booster of which I have replaced several times over the years including this time and still.....no brakes.
The symptoms are always the same.....a hard pedal, as if I didn't have vacuum assist or like squeezing the brake fluid through some kind of blockage which is reminiscent of no vacuum, but I have great vacuum. The vacuum booster was changed out twice this time with new replacement booster and once with a working booster from another truck of the same model. Also the proportioning valve was changed out several times and still no difference.
I have a shop manual and know the procedure to bleed the brakes on this model using the tool to hold in the proportioning valve pin etc. etc.
I am beginning to think that this truck is just not ever going to have good brakes..............any advice would be greatly appreciated!!!
__________________
Blue 72
Reply With Quote
5894
Sponsored Links
Advertisement
 
  #2  
Old 01-24-2020, 07:27 PM
Blue Goose's Avatar
Blue Goose Blue Goose is online now
Senior Member
 
Join Date: Dec 2012
Location: S Texas
Posts: 775
Default

Wow that is strange.We had half dozen of that generation of trucks although all were manual brakes and they stopped just fine.Even the earlier models that were drum\drum did fine.I'm assuming yours is disc\drum d52 in front and 11x2 out back.Are you sure vacumn line to booster is not collapsed.Just sounds like something with power assist.I have seen a big difference in the brake lining material but mostly on later models that went semi metallic or ceramic.I do alot of brake work and see sometimes the friction compound just doesn't stop well so I go to a different brand.My best luck was with Bendix.
Reply With Quote
15
  #3  
Old 01-26-2020, 07:55 AM
Jerryl W. Jerryl W. is offline
Junior Member
 
Join Date: Jan 2020
Location: Texas
Posts: 4
Default

Quote:
Originally Posted by Blue Goose View Post
Wow that is strange.We had half dozen of that generation of trucks although all were manual brakes and they stopped just fine.Even the earlier models that were drum\drum did fine.I'm assuming yours is disc\drum d52 in front and 11x2 out back.Are you sure vacumn line to booster is not collapsed.Just sounds like something with power assist.I have seen a big difference in the brake lining material but mostly on later models that went semi metallic or ceramic.I do alot of brake work and see sometimes the friction compound just doesn't stop well so I go to a different brand.My best luck was with Bendix.
Thank you for your reply Blue Goose.......There was some speculation that this was originally a manual brake system, but there is no way to know for sure that I know of.
The old brake system(front D52/rear 11"x 2")was what was on it and replaced numerous times before this last replacement using upgraded Delco and CCP mstr.cylinder / booster.
After this latest upgrade it does stop much better, but still not like any power assisted brake system that I have used before.
Everything has been replaced this last time, checked and double checked......with the exception of the steel lines that run from the master cylinder to each flex line. They said that these had good fluid flow.
In the past it has been suggested that I use different brake pads for better stopping power and there was no noticeable difference to me.
I have 18 inches of vacuum currently and it said that this is a minimum and my mechanic said that he wanted to try one more thing and that being installing a vacuum pump on my truck to see it that changes anything and if needed then purchase and install my own.
After this last upgrade it does stop better, but still not like any power assisted brake system that I ever experienced.
__________________
Blue 72
Reply With Quote
5894
  #4  
Old 01-26-2020, 03:06 PM
Blue Goose's Avatar
Blue Goose Blue Goose is online now
Senior Member
 
Join Date: Dec 2012
Location: S Texas
Posts: 775
Default

Ir it has been upgraded from manual,I think the booster pushrod at the pedal would have to be located closer to the pedal pivot which means there would be an extra hole.I assume the 18 inches of vacuum was checked at the booster.18 should be plenty at idle.
Reply With Quote
15
  #5  
Old 02-24-2020, 07:32 PM
Jerryl W. Jerryl W. is offline
Junior Member
 
Join Date: Jan 2020
Location: Texas
Posts: 4
Default

Quote:
Originally Posted by Blue Goose View Post
Ir it has been upgraded from manual,I think the booster pushrod at the pedal would have to be located closer to the pedal pivot which means there would be an extra hole.I assume the 18 inches of vacuum was checked at the booster.18 should be plenty at idle.
No sir....I find no extra holes in the pedal and yes the vacuum was checked at the carburetor, manifold, and the booster and was always good??
__________________
Blue 72
Reply With Quote
5894
  #6  
Old 02-27-2020, 08:59 AM
Evan's C10 Evan's C10 is online now
Junior Member
 
Join Date: Sep 2016
Location: Michigan
Posts: 19
Default

Yours is an interesting dilemma. Have you tried disconnecting the booster vacuum hose, depleting the vacuum storage (15 to 20 hard pumps of the brake pedal) and then seeing if the braking is any better/worse? If there is no change with no vacuum, then you have isolated your problem. If there is a change, then you know that vacuum is not your problem and that it lies elsewhere.

Also was the vacuum checked at the brake booster for sure? Perhaps the vacuum line is collapsed internally? As well, even if you tested the vacuum at the booster you are checking the vacuum in a static condition NOT in the dynamic way the booster will work. The vacuum gauge has a very small volume so a pinhole passage in a collapsed hose will allow enough vacuum to trigger the gauge but will not allow enough volume to power the booster.

Then there is also the possibility of a bad vacuum check valve that was transferred to each successive replacement booster? The best way would be to install a T-fitting and the vacuum gauge AFTER the check valve. But with many heads involved and many new parts thrown at it, I would be surprised if it is this easy.
Reply With Quote
2321
Sponsored Links
Advertisement
 
Reply

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

 
Advertisement

 


Partner Links



All times are GMT -4. The time now is 11:19 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
c10 trucks 67 72 c10 trucks c10 trucks for sale classic c10 trucks chevy c10 trucks used c10 trucks bagged c10 trucks slammed c10 trucks 1960 Chevy C10 Truck 1961 Chevy C10 Truck 1962 Chevy C10 Truck 1963 Chevy C10 Truck 1964 Chevy C10 Truck 1965 Chevy C10 Truck 1966 Chevy C10 Truck 1967 Chevy C10 Truck 1968 Chevy C10 Truck 1969 Chevy C10 Truck 1970 Chevy C10 Truck 1971 Chevy C10 Truck 1972 Chevy C10 Truck 1973 Chevy C10 Truck 1974 Chevy C10 Truck 1975 Chevy C10 Truck 1976 Chevy C10 Truck 1977 Chevy C10 Truck 1978 Chevy C10 Truck 1979 Chevy C10 Truck 1980 Chevy C10 Truck 1981 Chevy C10 Truck 1982 Chevy C10 Truck 1983 Chevy C10 Truck 1984 Chevy C10 Truck 1985 Chevy C10 Truck 1986 Chevy C10 Truck 1987 Chevy C10 Truck 1988 Chevy C10 Truck 1989 Chevy C10 Truck 1990 Chevy C10 Truck 1991 Chevy C10 Truck 1992 Chevy C10 Truck 1993 Chevy C10 Truck 1994 Chevy C10 Truck 1995 Chevy C10 Truck 1996 Chevy C10 Truck 1997 Chevy C10 Truck 1998 Chevy C10 Truck 1999 Chevy C10 Truck 2000 Chevy C10 Truck 2001 Chevy C10 Truck 1950 Chevrolet Truck 1968 C10 SNAKEBIT V-10 Hazel 1967 Chevrolet C10 BUILD 1968 C10 Chevrolet C10 Truck "5150" Plane Engine 68 c10 DINOS 1964 Chevrolet C10 DUALLY 1971 Chevrolet C10 "Pearl71" 1971 Brazilian style C10 1967 Chevrolet C10 Truck "Cloud9" C10 HISTORY AIR SUSPENSION Truck Frame Notches TYPES OF BODY DROP Patina Chevrolet Trucks The OKC Farm Truck Lambrecht Chevrolet Dealership C10 TRUCKS FOR SALE 1981 Chevrolet C-10 1972 Chevrolet C-10 s C10 Truck Racing crash FS 1960 Chevrolet C-10 FS 1972 Chevrolet C-10 Fs 1971 Chevrolet C-10 Fs 1970 Chevrolet C-10 Huge 1986 Chevy C10 4x4 NEW 1960 Chevrolet Apache Farmtruck Towing a Boat vs Twin Turbo Porsche Truck loading FAIL!! SOLID C10 Epic Chevy Truck Jump Fail What does 1000HP look like?  F 1967 Chevrolet C-10 Chevy Apache Twin Turbos F 1984 Chevrolet C10 What 3200HP of NOS Looks Like F 1972 Chevrolet C-10 1972 C-10 Texas Reaper  f 1978 Chevrolet C-10 2500 HP 632CI BBC chevy engine 1972 c10 SEMA ratrod F 1970 Chevrolet C-10 Full Size Chevy Jump Fail 1965 Chevrolet C-10 The Fastest Truck in the World f 1985 Chevrolet C-10 Stepside 1971 Chevrolet C-10 SHORT WHEEL BASE f. 1972 Chevrolet C-10 f. 1972 Chevrolet C-10 Ford Raptor Truck Jump Fail f 1981 Chevrolet C10 1971. Chevrolet C-10 Truck Jump and crash fail  A 1967 Chevrolet C-10 1971 Chevrolet C-10 1965 Chevrolet C-10  HOMECUTT 87 C10 chevy truck Arguing with a hater while Dragging my c10  Trent Eschete's '87 Chevy C10 Monster Truck Crashes Into Spectators Jerrys Jet Truck Full Video