Questions on grounding and brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smn69 · 03-11-2009, 12:14 AM

Finally in the process of putting things back together and I have two questions: First - I bought a grounding strap replacement kit and it has 6 straps in it. Where do they all go? Here is what I can come up with - bottom of cab to frame, firewall to back of engine, core support to frame, I am guessing bed to frame (but where), and engine to frame? Where would the last one go?
Next question - I did a front disc brake conversion and have a new master cylinder to hook up. The old lines are not bent to the right places so I cut them off about 6 inches above the frame and I am going to bend some new lines. The question is - on the back of the proportioning valve is a larger fitting (threaded hole for a fitting) and on the front portion of the valve there are two smaller fittings (threaded holes, one on the bottom and one below the black button) how do I plumb the Master (pictures would be a big help) and what size fittings and steel tubing do I need? I have a bender and flairing tool. Thanks in advance for any and all help. This is a great site!

Andy4639 · 03-11-2009, 02:04 AM

Maybe it's a extra. I can only come up with 5 also.
Frame to
CAB
BED
RADAITOR SUPPORT
MOTOR
MOTOR to CAB
I maybe wrong but didn't they come with 2 straps from motor to cab. For some reason I'm thinking that and don't know why!

Sorry can't help you on the brakes. I can get pictures though tomorrow maybe of my 71 stuff.

70GMCer · 03-11-2009, 07:39 AM

Mine had 2 straps from the back of the engine on each side to the cab firewall.

gcburdic · 03-11-2009, 07:58 AM

here's a few threads regarding ground strap locations....hope these help...

http://67-72chevytrucks.com/vboard/s...d.php?t=153283

http://67-72chevytrucks.com/vboard/s...d.php?t=280727

http://67-72chevytrucks.com/vboard/s...d.php?t=290003

**LockDoc** · 03-11-2009, 11:36 AM

Here are a couple of threads that might answer your brake questions.

http://67-72chevytrucks.com/vboard/s...d.php?t=306775

http://67-72chevytrucks.com/vboard/s....php?p=3178819

LockDoc

Andy4639 · 03-12-2009, 02:14 PM

Here is the master cycinder on my 71 with disc's up front.
The buttom front is for the front disc and the rear is for the drums.

smn69 · 03-12-2009, 02:25 PM

Thanks all, My questions were answered. Great site!

03-11-2009, 12:14 AM	#1
smn69 Registered User Join Date: Oct 2007 Location: Orem, Ut Posts: 132	Questions on grounding and brakes Finally in the process of putting things back together and I have two questions: First - I bought a grounding strap replacement kit and it has 6 straps in it. Where do they all go? Here is what I can come up with - bottom of cab to frame, firewall to back of engine, core support to frame, I am guessing bed to frame (but where), and engine to frame? Where would the last one go? Next question - I did a front disc brake conversion and have a new master cylinder to hook up. The old lines are not bent to the right places so I cut them off about 6 inches above the frame and I am going to bend some new lines. The question is - on the back of the proportioning valve is a larger fitting (threaded hole for a fitting) and on the front portion of the valve there are two smaller fittings (threaded holes, one on the bottom and one below the black button) how do I plumb the Master (pictures would be a big help) and what size fittings and steel tubing do I need? I have a bender and flairing tool. Thanks in advance for any and all help. This is a great site!

03-11-2009, 02:04 AM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Questions on grounding and brakes Maybe it's a extra. I can only come up with 5 also. Frame to CAB BED RADAITOR SUPPORT MOTOR MOTOR to CAB I maybe wrong but didn't they come with 2 straps from motor to cab. For some reason I'm thinking that and don't know why! Sorry can't help you on the brakes. I can get pictures though tomorrow maybe of my 71 stuff. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 03-11-2009 at 02:06 AM.

03-11-2009, 07:39 AM	#3
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Questions on grounding and brakes Mine had 2 straps from the back of the engine on each side to the cab firewall. __________________ 1997 GMC Sierra Ext 1965 Mustang

03-11-2009, 07:58 AM	#4
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Questions on grounding and brakes here's a few threads regarding ground strap locations....hope these help... http://67-72chevytrucks.com/vboard/s...d.php?t=153283 http://67-72chevytrucks.com/vboard/s...d.php?t=280727 http://67-72chevytrucks.com/vboard/s...d.php?t=290003 __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

03-11-2009, 11:36 AM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,772	Re: Questions on grounding and brakes Here are a couple of threads that might answer your brake questions. http://67-72chevytrucks.com/vboard/s...d.php?t=306775 http://67-72chevytrucks.com/vboard/s....php?p=3178819 LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 03-11-2009 at 11:36 AM.

03-12-2009, 02:14 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Questions on grounding and brakes Here is the master cycinder on my 71 with disc's up front. The buttom front is for the front disc and the rear is for the drums. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

03-12-2009, 02:25 PM	#7
smn69 Registered User Join Date: Oct 2007 Location: Orem, Ut Posts: 132	Re: Questions on grounding and brakes Thanks all, My questions were answered. Great site!



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