Brake booster question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70's luvr · 12-23-2014, 08:17 AM

I'm up grading my 1970 3/4 ton from drum to disc in front so I ordered a 1972 booster/master cylinder combo from Advanced..figuring 72 had disc up front so it should all bolt right up...or not.

What I bought.

what came off my truck.

My original booster was bad so that's what prompted my combo purchase. The issue is the rod is longer on my new booster. Do I need a different bracket (longer) from a 72 to make this work? Should I just get a 1970 booster and then a 72 master?

Steve Cole · 12-23-2014, 09:45 AM

You can buy an adjustable rod and adjust it to give you the same overall length you currently have.

70's luvr · 12-23-2014, 11:21 AM

Okay Steve that gives me one option.

Looks like a longer bracket would be the cheapest. Does a 73-87 bracket accomplish the same thing? I passed a scrapyard yesterday with that model out front.

**FirstOwner69** · 12-23-2014, 01:52 PM

As I recall, the 71/72 disc booster bracket mounts the booster farther from the firewall. They also added a couple braces from the booster to the firewall which were probably needed for additional support. Here is a picture (top) showing the braces. If you look for the braces, the "flat" one for the 3/4 ton is different (longer) than the 1/2 ton version (see 2nd picture for comparison). Unfortunately, I don't have a picture from the side showing the mounting brackets.

EDIT: Here's a link to a thread that shows a side view in post #4. It's a half ton but the bracket is the same. http://67-72chevytrucks.com/vboard/s...d.php?t=628830

**67 cst swb** · 12-23-2014, 02:01 PM

Tuckers in Las Vegas has power booster/master cyl/prop valve/bracket assy on sale right now... part# FPB-6772
check it out:
http://www.tuckersparts.com/Power-Br...-FPB-6772.html

JimKshortstep4x4 · 12-23-2014, 08:37 PM

The longer booster to firewall brackets will make your booster combination work. It does push the assembly forward as can be seen in the attached photo.

Jim

scampr · 12-23-2014, 09:25 PM

You have me thinking which usually gets me in trouble.... would the old unit you have fit on a 67 C30 , i have a manual brakes and the old legs are getting weaker.

12-23-2014, 08:17 AM	#1
70's luvr Registered User Join Date: Nov 2013 Location: Spring Hill,Fl Posts: 223	Brake booster question I'm up grading my 1970 3/4 ton from drum to disc in front so I ordered a 1972 booster/master cylinder combo from Advanced..figuring 72 had disc up front so it should all bolt right up...or not. What I bought. what came off my truck. My original booster was bad so that's what prompted my combo purchase. The issue is the rod is longer on my new booster. Do I need a different bracket (longer) from a 72 to make this work? Should I just get a 1970 booster and then a 72 master?

12-23-2014, 09:45 AM	#2
Steve Cole Registered User Join Date: May 2012 Location: Faith,NC Posts: 1,626	Re: Brake booster question You can buy an adjustable rod and adjust it to give you the same overall length you currently have.

12-23-2014, 11:21 AM	#3
70's luvr Registered User Join Date: Nov 2013 Location: Spring Hill,Fl Posts: 223	Re: Brake booster question Okay Steve that gives me one option. Looks like a longer bracket would be the cheapest. Does a 73-87 bracket accomplish the same thing? I passed a scrapyard yesterday with that model out front.

12-23-2014, 02:01 PM	#5
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Re: Brake booster question Tuckers in Las Vegas has power booster/master cyl/prop valve/bracket assy on sale right now... part# FPB-6772 check it out: http://www.tuckersparts.com/Power-Br...-FPB-6772.html __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White

12-23-2014, 08:37 PM	#6
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Brake booster question The longer booster to firewall brackets will make your booster combination work. It does push the assembly forward as can be seen in the attached photo. Jim Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-23-2014, 01:52 PM	#4
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,852	Re: Brake booster question As I recall, the 71/72 disc booster bracket mounts the booster farther from the firewall. They also added a couple braces from the booster to the firewall which were probably needed for additional support. Here is a picture (top) showing the braces. If you look for the braces, the "flat" one for the 3/4 ton is different (longer) than the 1/2 ton version (see 2nd picture for comparison). Unfortunately, I don't have a picture from the side showing the mounting brackets. EDIT: Here's a link to a thread that shows a side view in post #4. It's a half ton but the bracket is the same. http://67-72chevytrucks.com/vboard/s...d.php?t=628830 Attached Images Last edited by FirstOwner69; 12-23-2014 at 02:03 PM.

12-23-2014, 09:25 PM	#7
scampr Registered User Join Date: Dec 2013 Location: peterborough NH Posts: 84	Re: Brake booster question You have me thinking which usually gets me in trouble.... would the old unit you have fit on a 67 C30 , i have a manual brakes and the old legs are getting weaker.



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