im new...need help with crane vacuum cannister - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RAT-AT-TACH · 05-13-2003, 11:27 PM

hi,im new here,my brother (spoof) suggested i join this site.
heres my prob,i have a big block with a radical cam thats not putting out enough vacuum for my brakes,the auto parts store here has a crane vacuum canister (vacuum reserve system) what i need to know is will this be all i need to get my vacuum up if so how does it work and how easy is it to install.

miket · 05-13-2003, 11:34 PM

how much vaccum are getting off the motor now? Have you tried putting a vaccum guage on the motor?

RAT-AT-TACH · 05-14-2003, 12:03 AM

yes,its at 12.5hg i was told it should be between 16-18hg.

miket · 05-14-2003, 12:21 AM

interesting...I went through this same exercise with my 502 and found that 11-12 works great for my brakes...which I get at idle out of gear...unfortunately it drops to 7-9 at idle in gear...so I "may" be looking at a canister or pump soon.

68LSS1 · 05-14-2003, 12:28 AM

The cans are pretty easy to install. Mount it and run a vacuum line from the back of the intake/carb to the can. Then from the can to the brake booster. A couple of things you might check first. May sure the check valve (the plastic piece where the line connects at the booster) is good. Put a vacuum on the booster and check it also. I ran one many years ago on a 351C with a big solid lift cam and it worked great.

breeh · 05-14-2003, 12:29 AM

My power brakes work fine at 12 as well.

*dtlilly* · 05-14-2003, 01:46 AM

I have a hopped up 350, and 13.25 works fine for me.

Hooter · 05-14-2003, 02:11 AM

sounds like you might have a leak in your booster, they like to leak at the back, do you get a whishing noise when you hit your brakes?

RAT-AT-TACH · 05-14-2003, 08:50 AM

im not sure,i just bought the truck,i get it at the end of june,its spoofs suburban.he said the brakes were fine untill he put the radical cam in.

Longhorn Man · 05-14-2003, 11:24 PM

Some things to remember, there were at least 4 booster designs, with some of them being daul diaphram units. Not all of them are as pickey as the others.
I have used the vac cans in the past. It was simple, find a place to mount it, run the hose to it, I used a check valve on the can (just liek the one on the booster its self) and then plump it to the booster.
Mine worked fine, but in stop and go I'd get surprised with a hard pedal after about 6 brake aplications. Then all you need to do is pop it in neutral and rev the motor once.

RAT-AT-TACH · 05-14-2003, 11:39 PM

thanks guys,thats everything i needed to know.

05-13-2003, 11:27 PM	#1
RAT-AT-TACH Registered User Join Date: May 2003 Location: shawnigan lake b.c. canada Posts: 287	im new...need help with crane vacuum cannister hi,im new here,my brother (spoof) suggested i join this site. heres my prob,i have a big block with a radical cam thats not putting out enough vacuum for my brakes,the auto parts store here has a crane vacuum canister (vacuum reserve system) what i need to know is will this be all i need to get my vacuum up if so how does it work and how easy is it to install.

05-13-2003, 11:34 PM	#2
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	how much vaccum are getting off the motor now? Have you tried putting a vaccum guage on the motor? __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

05-14-2003, 12:03 AM	#3
RAT-AT-TACH Registered User Join Date: May 2003 Location: shawnigan lake b.c. canada Posts: 287	yes,its at 12.5hg i was told it should be between 16-18hg. __________________ who says moneys not everything....try running a rat!

05-14-2003, 12:21 AM	#4
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	interesting...I went through this same exercise with my 502 and found that 11-12 works great for my brakes...which I get at idle out of gear...unfortunately it drops to 7-9 at idle in gear...so I "may" be looking at a canister or pump soon. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

05-14-2003, 12:28 AM	#5
68LSS1 Registered User Join Date: Dec 2002 Location: Tampa Posts: 1,191	The cans are pretty easy to install. Mount it and run a vacuum line from the back of the intake/carb to the can. Then from the can to the brake booster. A couple of things you might check first. May sure the check valve (the plastic piece where the line connects at the booster) is good. Put a vacuum on the booster and check it also. I ran one many years ago on a 351C with a big solid lift cam and it worked great. __________________ '68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc

05-14-2003, 12:29 AM	#6
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	My power brakes work fine at 12 as well. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

05-14-2003, 01:46 AM	#7
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	I have a hopped up 350, and 13.25 works fine for me.

05-14-2003, 02:11 AM	#8
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	sounds like you might have a leak in your booster, they like to leak at the back, do you get a whishing noise when you hit your brakes? __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

05-14-2003, 08:50 AM	#9
RAT-AT-TACH Registered User Join Date: May 2003 Location: shawnigan lake b.c. canada Posts: 287	im not sure,i just bought the truck,i get it at the end of june,its spoofs suburban.he said the brakes were fine untill he put the radical cam in. __________________ who says moneys not everything....try running a rat!

05-14-2003, 11:24 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Some things to remember, there were at least 4 booster designs, with some of them being daul diaphram units. Not all of them are as pickey as the others. I have used the vac cans in the past. It was simple, find a place to mount it, run the hose to it, I used a check valve on the can (just liek the one on the booster its self) and then plump it to the booster. Mine worked fine, but in stop and go I'd get surprised with a hard pedal after about 6 brake aplications. Then all you need to do is pop it in neutral and rev the motor once.

05-14-2003, 11:39 PM	#11
RAT-AT-TACH Registered User Join Date: May 2003 Location: shawnigan lake b.c. canada Posts: 287	thanks guys,thats everything i needed to know.



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