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 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-16-2012, 04:33 PM   #1
canadian 4x4
Registered User
 
canadian 4x4's Avatar
 
Join Date: Nov 2010
Location: Ontario
Posts: 134
Brake booster

i have a brake fluid leak coming from where the master cylinder meets the booster. is there a seal there? do i need a new booster or is it an issue with the master cylinder. the leak has destroyed the paint on my inner fenders.
__________________
85 swb c10 6/6 drop
83 c10 bagged and sfbd project
canadian 4x4 is offline   Reply With Quote
Old 10-16-2012, 04:50 PM   #2
Edahall
Registered User
 
Join Date: May 2011
Location: Goliad, TX
Posts: 672
Re: Brake booster

Quote:
Originally Posted by canadian 4x4 View Post
i have a brake fluid leak coming from where the master cylinder meets the booster. is there a seal there? do i need a new booster or is it an issue with the master cylinder. the leak has destroyed the paint on my inner fenders.
The problem is with the master cylinder but the leaking brake fluid may have also ruined the brake booster.
__________________
1990 ¾ ton 4x4 Chevy Suburban
-Cummins Diesel - 12 valve - factory rebuilt
-6 speed bullet proof manual transmission - NV5600
-Gear Vendors Overdrive - HX35 Holset Turbo
-NP205 iron transfer case
-3.73 gears -2" Lift
Edahall is offline   Reply With Quote
Old 10-16-2012, 05:10 PM   #3
canadian 4x4
Registered User
 
canadian 4x4's Avatar
 
Join Date: Nov 2010
Location: Ontario
Posts: 134
Re: Brake booster

Brakes seem to work fine, its not a daily driver it hasnt had many mile on it since it has started leaking. how do i check the booster?
__________________
85 swb c10 6/6 drop
83 c10 bagged and sfbd project
canadian 4x4 is offline   Reply With Quote
Old 10-16-2012, 05:50 PM   #4
86dragracer
Registered User
 
86dragracer's Avatar
 
Join Date: May 2010
Location: Tahlequah, OK
Posts: 36
Re: Brake booster

Your booster will be fine. Slap a new master on there and forget about it.
__________________
2016 GMC Sierra Double Cab
1986 GMC Sierra Classic SWB
1972 Chevy Cheyenne C20 4x4 Camper Special
86dragracer is offline   Reply With Quote
Old 10-16-2012, 11:47 PM   #5
motornut
78K & 79C Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: Brake booster

Quote:
Originally Posted by canadian 4x4 View Post
Brakes seem to work fine, its not a daily driver it hasnt had many mile on it since it has started leaking. how do i check the booster?
quick and simple check,
go out in the morn cold pull the vac plug to the carb on it,how much suction was there
do this when it's off 2-3 times after driving and compare to sitting all night
__________________
John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
motornut is offline   Reply With Quote
Old 10-17-2012, 03:55 AM   #6
wraprail
Registered User
 
wraprail's Avatar
 
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
Re: Brake booster

Quote:
Originally Posted by motornut View Post
quick and simple check,
go out in the morn cold pull the vac plug to the carb on it,how much suction was there
do this when it's off 2-3 times after driving and compare to sitting all night
Huh?
Posted via Mobile Device
wraprail is offline   Reply With Quote
Old 10-17-2012, 05:16 AM   #7
motornut
78K & 79C Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: Brake booster

If your booster is leaking
It prob wont have much vac in the morn
Pull the valve(10:00 o'clock on the booster face) out of the booster , should have suction
After driving see if more or less vac, or the same
Posted via Mobile Device
__________________
John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
motornut is offline   Reply With Quote
Old 10-17-2012, 05:53 PM   #8
MalibuSSwagon
Registered User
 
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
Re: Brake booster

If you're not driving it much you may not have noticed that the brake pedal loses pressure when you're holding it steady. I have replaced many MC's on Hondas because the MC leaks. Never had to replace a booster.
MalibuSSwagon is offline   Reply With Quote
Old 11-09-2012, 06:24 AM   #9
scott-wisc
Registered User
 
scott-wisc's Avatar
 
Join Date: Feb 2012
Location: Wisconsin
Posts: 144
Re: Brake booster

Mine just started leaking. Is there a seal between the mc and booster?
scott-wisc is offline   Reply With Quote
Old 11-09-2012, 08:41 AM   #10
old Rusty C10
Robert Olson Transport
 
old Rusty C10's Avatar
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,310
Re: Brake booster

the seal between the master and the booster is a foam rubber kind of thing that seals in the vacuum on the booster the seals for the fluid are all on the master the advice you got was spot on your master is leaking from the seal up by the rear of it. change your master and you should be ok... while youre at it clean and paint your inner fender and the truck is good as new
__________________
Bob



1951 International running on a squarebody chassis


"If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board"
http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!)


PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport

Live each day to the fullest.. you never know when fate is going to pull the rug out from under you...
I hate cancer!!
old Rusty C10 is offline   Reply With Quote
Reply

Bookmarks


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 05:23 PM.


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