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 > General Truck Forums > Suspension

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-27-2013, 11:05 AM   #1
Ricks1971
Senior Member
 
Ricks1971's Avatar
 
Join Date: Mar 2006
Location: Clarkrange Tennessee
Posts: 1,787
1/2 ton or 3/4 ton brake cylinder booster

I am converting my 67 to disc brakes and also upgrading the rear to disc brakes too. My question is should I use a 1/2 ton or 3/4 ton brake booster?
Ricks1971 is offline   Reply With Quote
Old 05-30-2013, 09:09 PM   #2
lolife99
67-72 parts collector,…
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
Re: 1/2 ton or 3/4 ton brake cylinder booster

I would just use a 71-72 1/2-ton booster, master cylinder and prop valve.
I'm not sure there is much difference.
Many people use aftermarket boosters.
__________________
Keith

Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
lolife99 is offline   Reply With Quote
Old 05-31-2013, 02:20 AM   #3
andrewmp6
Registered User
 
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
Re: 1/2 ton or 3/4 ton brake cylinder booster

Just make sure its for disc front and rear you should be fine.
andrewmp6 is offline   Reply With Quote
Old 05-31-2013, 08:22 AM   #4
Rochlow
Registered User
 
Join Date: Aug 2006
Location: St. Albans, Vt
Posts: 2,520
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by lolife99 View Post
I would just use a 71-72 1/2-ton booster, master cylinder and prop valve.
I'm not sure there is much difference.
Many people use aftermarket boosters.
Plus, these can be bought from local parts stores for around $150 as opposed to $299-399 for CPP or other aftermarket brands.
__________________
///Relaxed Atmosphere
Rochlow is offline   Reply With Quote
Old 05-31-2013, 10:50 AM   #5
Gus350
68 C 10
 
Gus350's Avatar
 
Join Date: Aug 2010
Location: Advance ,Mo
Posts: 554
Re: 1/2 ton or 3/4 ton brake cylinder booster

Do you even really need the booster if your going for a clean firewall look. How do they perform without one?

thanks. Kevin
__________________


Kevin

"Life is Hard But its Harder when your Stupid"
John Wayne
68 C10
70 C20
http://67-72chevytrucks.com/vboard/s....php?t=602326#
Gus350 is offline   Reply With Quote
Old 05-31-2013, 11:49 AM   #6
lolife99
67-72 parts collector,…
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by andrewmp6 View Post
Just make sure its for disc front and rear you should be fine.
I missed the rear disc brake part.

You may need to purchase a rear disc specific prop valve from an aftermarket source.
Some disc brake kits have you disassemble and modifiy the stock prop valve.
Some people don't run a stock prop valve.
They run an adjustable prop valve installed in the rear disc brake line.
__________________
Keith

Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
lolife99 is offline   Reply With Quote
Old 05-31-2013, 11:51 AM   #7
lolife99
67-72 parts collector,…
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by Gus350 View Post
Do you even really need the booster if your going for a clean firewall look. How do they perform without one?

thanks. Kevin
There is more pedal effort without the booster,... but I think it's worth the look.
It's just something you have to get use to,...
__________________
Keith

Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
lolife99 is offline   Reply With Quote
Old 06-07-2013, 03:53 PM   #8
Jonboy
Slots go on anything!
 
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by lolife99 View Post
I missed the rear disc brake part.

You may need to purchase a rear disc specific prop valve from an aftermarket source.
Some disc brake kits have you disassemble and modifiy the stock prop valve.
Some people don't run a stock prop valve.
They run an adjustable prop valve installed in the rear disc brake line.
Keith, what do you need to do to modify the stock prop valve? I am thinking about running 4 wheel discs on my '74. As much info as I have been devouring the last couple of days, my head is swimming now.....
Jonboy is offline   Reply With Quote
Old 06-07-2013, 07:05 PM   #9
lolife99
67-72 parts collector,…
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by Jonboy View Post
Keith, what do you need to do to modify the stock prop valve? I am thinking about running 4 wheel discs on my '74. As much info as I have been devouring the last couple of days, my head is swimming now.....
I have not done this mod my self.

Look here at the picture:
http://www.classicperform.com/Instru...structions.pdf

Notes:
This modification will disable the proportioning valve on a disc drum combination
valve and convert it to a disc disc type combination valve.

Instructions:
1. Remove the hex shaped proportioning valve assembly from the rear of
the combination valve. See the illustration to identify the different parts
of the combination valve.

2. Using a thin set of pliers, carefully reach inside the combination valve
and remove the small rubber piston from the isolation valve. This will
disable the proportioning valve.

3. Reinstall the hex shaped proportioning valve assembly into the combination
valve.

4. Double check that the proportioning valve has been tightened correctly,
and that there are no leaks.
__________________
Keith

Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823

Last edited by lolife99; 06-07-2013 at 07:17 PM.
lolife99 is offline   Reply With Quote
Old 06-07-2013, 07:15 PM   #10
Daaaanz67
Registered User
 
Join Date: Nov 2011
Location: Idaho
Posts: 857
Re: 1/2 ton or 3/4 ton brake cylinder booster

X2 on what lolife said.
Posted via Mobile Device
Daaaanz67 is offline   Reply With Quote
Old 06-08-2013, 09:21 AM   #11
LONGHAIR
just can't cover up my redneck
 
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by Gus350 View Post
Do you even really need the booster if your going for a clean firewall look. How do they perform without one?

thanks. Kevin
If you are really set on the clean firewall look, there are better ways to go than removing the booster. The increased peddle effort required is bad enough in cars, it would be worse in a truck.....and 4 wheel disc would probably be unstoppable.
"Power brakes" came along because of discs. While they are better in several ways, peddle effort vs. stopping power is not one of them, you need the booster.

There are "remote booster" kits available for many applications. This puts the booster behind the dash or under the floor, but leaves the master cylinder alone.
There is also a set-up that puts the booster and master cylinder together behind the dash. It is an angled bracket that mounts them parallel to the firewall, in the cab. This eliminates the whole thing from the engine compartment.
__________________
You can review the site's rules here.



Quote:
Originally Posted by Longhorn Man View Post
As for reading directions...
The directions are nothing but another man's opinion.
Learn from the mistakes of others, you won't live long enough to make them all yourself...

Bad planning on your part does not necessarily constitute an instant emergency on my part....

The great thing about being a pessimist is that you are either pleasantly surprised or right.
LONGHAIR is offline   Reply With Quote
Old 06-08-2013, 12:22 PM   #12
wraprail
Registered User
 
wraprail's Avatar
 
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by Gus350 View Post
Do you even really need the booster if your going for a clean firewall look. How do they perform without one?

thanks. Kevin

I have used manual (no power booster) 4 wheel disc brakes for the last 13 years, on two differant C10s.

First with a corvette master and now with a chrysler master.

With the correct Master Cylinder bore and the right pedal ratio the effort required to stop is not much more than power brakes. Mine is even less than the factory manual disc/drum brakes that came on these trucks.

I tow a double axle car trailer with a 3200 pound car on it and have no problem stopping it. And right now the trailer brakes are not working.

Most all race cars in most forms of racing these days have 4 wheel disc and don't use a brake booster.
__________________
wraprail is offline   Reply With Quote
Old 06-08-2013, 08:43 PM   #13
LONGHAIR
just can't cover up my redneck
 
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by wraprail View Post

Most all race cars in most forms of racing these days have 4 wheel disc and don't use a brake booster.
That is a completely unfair analogy. Those racecars are sporting huge diameter rotors and have very aggressive pad compounds. These are not only prohibitively expensive but the would be eaten up in daily street driving.
__________________
You can review the site's rules here.



Quote:
Originally Posted by Longhorn Man View Post
As for reading directions...
The directions are nothing but another man's opinion.
Learn from the mistakes of others, you won't live long enough to make them all yourself...

Bad planning on your part does not necessarily constitute an instant emergency on my part....

The great thing about being a pessimist is that you are either pleasantly surprised or right.
LONGHAIR is offline   Reply With Quote
Old 06-08-2013, 09:28 PM   #14
Bigdav160
Registered User
 
Bigdav160's Avatar
 
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
Re: 1/2 ton or 3/4 ton brake cylinder booster

I'm with Longhair on this. Disc brakes need power assist.

I own two Corvettes. One with power assist, one without. There's a big difference in braking power.
__________________
My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
Bigdav160 is offline   Reply With Quote
Old 06-12-2013, 01:16 AM   #15
68 TT
Still plays with trucks
 
68 TT's Avatar
 
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by lolife99 View Post
I missed the rear disc brake part.

You may need to purchase a rear disc specific prop valve from an aftermarket source.
Some disc brake kits have you disassemble and modifiy the stock prop valve.
Some people don't run a stock prop valve.
They run an adjustable prop valve installed in the rear disc brake line.
I just put this new Wilwood adjustable prop valve into my Camaro. It has the same configuration and bolt pattern as the common GM valve but also incorporates the adjustment knob for dialing in your brakes. Great idea.

http://www.summitracing.com/parts/wi...1179/overview/
Attached Images
 
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577
69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E
79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars
68 TT is offline   Reply With Quote
Old 06-12-2013, 01:21 AM   #16
68 TT
Still plays with trucks
 
68 TT's Avatar
 
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
Re: 1/2 ton or 3/4 ton brake cylinder booster

Quote:
Originally Posted by Bigdav160 View Post
I'm with Longhair on this. Disc brakes need power assist.

I own two Corvettes. One with power assist, one without. There's a big difference in braking power.
x3

Power brakes are a must with a heavy truck.

Another option is a 1-ton truck hydra-boost conversion rather than a vacuum booster setup.
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577
69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E
79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars
68 TT is offline   Reply With Quote
Old 06-12-2013, 02:27 AM   #17
Ricks1971
Senior Member
 
Ricks1971's Avatar
 
Join Date: Mar 2006
Location: Clarkrange Tennessee
Posts: 1,787
Re: 1/2 ton or 3/4 ton brake cylinder booster

All I really wanted to know if I should use a 1/2 ton or 3/4 ton booster on my 67 C10? LOL
Ricks1971 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 07:19 PM.


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