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#1 |
Shortbox wanna-be.
Join Date: Mar 2002
Location: Fort St.John, British Columbia, Canada
Posts: 773
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Another brake booster question.
Can a brake booster from a '70 that had drum/drum brakes, be used on a disc/drum truck if I installe the disc/drum master onto it?
Basically I'm asking if it was the same booster on each truck with just a master change?
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1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH) ![]() |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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The booster is not the same. I tried a disk drum booster on a drum drum truck..couldn't get it.
Last edited by Longhorn Man; 07-13-2002 at 12:06 AM. |
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#3 |
Collector of rusty Items
Join Date: Dec 2001
Location: Sisters,Oregon USA
Posts: 731
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Hmmm...
I never thought the booster made that much difference, just the master cylinder. I think the real important thing is having the disc proportioning valve and the corect master cylinder. Good luck.
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Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends. |
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#4 |
Registered User
Join Date: Dec 1999
Location: san diego, ca
Posts: 546
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The boosters and brackets are different. You can get the brackets off of any 70-72 truck with discs. 1/2 tons and 3/4 tons have different boosters but 1/2 tons, 3/4 tons and 2wd/4wd have the same brackets. The lower brace is longer on the 3/4 tons and they have one extra brace on the side.
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'70 K-20 San Diego, CA |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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The rods inside are not the same either.
And actually, it is 71 and 72..not 70, they still had drums. |
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#6 |
Registered User
Join Date: Nov 2001
Location: Concord,NC,USA
Posts: 743
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I will have to politely disagree with you cannot use a drum/drum booster on a disc/drum truck. I have used drum/drum boosters on several trucks and never had one problem. I have a friend with a 70 1 ton flat bed with factory power brakes and he put a 1 ton disc set up on the front and never changed the proportioning valve or anything and I can personally say it will stand you on your head. I know that the 1/2 ton and 3/4 ton are different even those all bolt up the same because I just put a 1/2 ton cab on my 3/4 ton and removed the 1/2 ton booster and used my 3/4 ton booster and I have excellent brakes (even better than before).
Just my 2 Cents worth. BBB ![]() |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Interesting. I tried putting a 72 booster on a 70 that was still set up for drums....it was a big no go. nothing lined up. i fought and cussed for hrs. I just ended up going to my storage unit and getting the 70 3/4 ton booster and slapping it onto the 70 one ton. Bolted on with no cussing, nor bleeding.
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#8 |
Semper Fidelis
Join Date: Dec 2001
Location: Cedar City, Utah
Posts: 654
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I have a 70 C10 that I want to put a 71 booster on. will it work?
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72 Chevy C 20 with 402 For sale 85 GMC K2500 ![]() 83 Trans Am Cedar City, Utah (Missouri Native) |
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#9 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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Andy.......please re-read your first post. Exp. your spelling....
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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OMG! and it didn't edit it on it's own!
thanks jason. |
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#11 |
Registered User
![]() Join Date: Jul 2001
Location: Praireville. LA 70769
Posts: 390
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I put a 72 booster and master on my 70. I used the orginal proportioning valve. The set up works for me.
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11 Surbaban 70 C 10 still in progress |
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#12 | |
Registered User
Join Date: Dec 1999
Location: san diego, ca
Posts: 546
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Quote:
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'70 K-20 San Diego, CA |
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#13 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Looking at my dated factory paper work, there were no discs untill the model year '71. A '71 made in late '70 would have them, but there was no option. You may have seen a truck updated with them though.
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#14 |
Registered User
![]() Join Date: Apr 2000
Location: Bradenton, FL
Posts: 1,036
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There is a differance between 3/4 and 1/2 ton boosters. You can use a 71 or 72 1/2 ton a 70.
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1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
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#15 |
Keepin' It Stock
Join Date: Aug 2001
Location: Grand Island, Nebraska, USA
Posts: 554
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Well, we certainly cleared that up.
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72 Sierra Grande - Maych Forget about "do it right the first time". Do it wrong the first time to learn how, then do it right the second time. |
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#16 |
Registered User
Join Date: Apr 2002
Location: knox, Tenn.
Posts: 150
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i have a 3/4 ton booster 69or 70 can i put it on my 69 1/2 ton?
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69 SHORT FLEET SIDE MAROON RESTORED. 71 LONG FLEET RESTORED D/DRIVER. BUT ALWAYS LOOKING TO IMPROVE 68 SHORT UNDER CONSTRUCTION |
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#17 |
Registered User
![]() Join Date: Feb 2000
Location: Georgetown, KY, USA
Posts: 631
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While I have not done anything yet on my drum to disk swap, I bought some parts from a board member a few years back and inthe deal he threw in a booster w/master cyc for disk brake front end. I currently have power drums all around and the p/n's on the boosters are the same. So I'm assuming they will work after I swap the rods between the booster and master cyc. Both are 1/2 ton.
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#18 |
Registered User
Join Date: Oct 2001
Location: SW Washington
Posts: 1,006
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I took a 3/4 ton booster from a 69 drum/drum truck, and it worked perfect on my 72 1/2 ton. I did toss the master cylinder from the 69, and just used the Master Cylinder and preportioning valve that my 72 Disk/Drum setup already had. It works great!! No modifications.
Maybe the problem occurs when you use a newer booster on an older truck. ie: a 72 booster on a 6x truck? Really Fast. Yes. You can use the booster from the 3/4 ton. The 3/4 ton booster is a dual diphram booster, and will help your truck stop better. Sorry this thread is so confusing. Darren
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Washington State 1967 Chevy C10 LWB Rodstoration In Progress. 1972 K20 Cheyenne Super Last edited by imdarren; 07-19-2002 at 02:01 PM. |
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#19 |
Shortbox wanna-be.
Join Date: Mar 2002
Location: Fort St.John, British Columbia, Canada
Posts: 773
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Good to know. This is helping alot.
Thanks!
__________________
1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH) ![]() |
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