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#1 |
Senior Member
![]() Join Date: Jan 2012
Location: Texan, back in TX
Posts: 2,153
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1970 C/10 Brake Booster Bracket Question
I have a 1970 C/10 that originally came with manual drum brakes front and back. I am adding a front disc brakes and a factory Delco/Moraine brake booster, new master cylinder and disc/drum prop valve. When I was getting parts together for this upgrade I purchase a set of brake booster brackets from someone here on the forum and there were two booster support brackets included. I can't figure out where they bolt up to the firewall. I'm thinking that these support brackets may have come along in 1971 with the addition of factory disc brakes.
Did pre-1971 trucks with drum brake boosters not have these brackets? Are they necessary now that I have a booster and front disc brakes? Here's a picture of the support brackets I'm referring to. |
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#2 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,396
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Re: 1970 C/10 Brake Booster Bracket Question
I had power drum brakes on my '70 C20 and converted to front disc. It never had those brackets, and the first time I saw it was in '80.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#3 |
Senior Member
![]() Join Date: Jan 2012
Location: Texan, back in TX
Posts: 2,153
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Re: 1970 C/10 Brake Booster Bracket Question
I've found pics of how the were installed on other trucks. Here are a couple examples I have found but I can't see exactly where they attach.
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#4 |
Senior Member
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Location: Texan, back in TX
Posts: 2,153
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Re: 1970 C/10 Brake Booster Bracket Question
Talking to people locally, I'm getting conflicting info on whether or not I need to add those brackets. Some people are telling me that they are definitely needed for support. But I thought that they had drum brake trucks with boosters before these brackets were created.
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#5 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,396
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Re: 1970 C/10 Brake Booster Bracket Question
Maybe it's a requirement for manual transmission-equipped vehicles? Not that pushing in the clutch pedal is going to place that much more force on the firewall.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#6 |
Registered User
Join Date: Jan 2016
Location: Forest City NC
Posts: 30
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Re: 1970 C/10 Brake Booster Bracket Question
The round bracket goes from where the booster bolts to the fire wall brackets and it bolts to the fire wall. My set up came off a C20 which I installed on my C10 and it came with the round bracket. The C20 booster is bigger than the C10.
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#7 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: 1970 C/10 Brake Booster Bracket Question
Both my 72 C/10's have the braces,,,The round rod braces the booster via the top left bracket bolt on the back of the booster and attaches to the firewall behind the hinge. The flat brace attaches to MC bolt, (left side) and runs down, again attaching to the firewall below the unit...
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#8 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: 1970 C/10 Brake Booster Bracket Question
Another look...
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#9 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: 1970 C/10 Brake Booster Bracket Question
My 72 had them...I'd put them on. More is better in this case and their not hard to install. I am curious about their concourse correctness through the years though. Here's a pic and a close-up that should help.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#10 |
Senior Member
![]() Join Date: Jan 2012
Location: Texan, back in TX
Posts: 2,153
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Re: 1970 C/10 Brake Booster Bracket Question
Hey everyone, thanks for the info and pics.
I have scoured the forum for more information on this subject and here's what I've come up with so far. The circular hole in the "round" bar brace attaches to the back of the booster at the upper, driver's side bolt (see the first image). The oblong hole in the bar attaches to an existing bolt sticking out of the firewall, above and to the right of a rectangular hole used for the e-brake (see the second image). The "flat" channel iron style brace attaches to a bolt on the front of the booster just in front of the prop valve bracket, (also see the second image). Okay, so this is where things get sketchy. The other end attaches to the firewall to a point above and to the right of the corner of the driver's side cab rail that attaches the cab to the frame, (also shown in the second image). My 1970 C/10 doesn't have a hole or bolt in that location. It seems that this was a '71 and up thing. I have included a picture from member FirstOwner69's firewall which shows some dimples in that area and I have circled (in yellow) the dimple that I believe coincides with where the hole/bolt would be on a later truck (see the third image). I have also included an image of the firewall on member GASoline71's 1972 GMC and have circled the two mounting spots in red. From what I've found, his truck would have had the hole from the factory (fourth image). I also came across a post http://67-72chevytrucks.com/vboard/s...90&postcount=7 where a member added a booster and the braces to a 1968 pickup. If you look carefully, you can see there are even more differences in the firewall. Hopefully this information will be of some help to others. I would like to have found a couple of close-up pics of that lower mounting spot from the inside and outside of a '71 or up cab. Just to see how it was originally attached and if there is any bracing inside the cab there. |
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#11 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: 1970 C/10 Brake Booster Bracket Question
To anybody that says that the "brackets" aren't necessary, GM went to a lot of trouble and expense to put those brackets on the trucks. If they weren't needed they wouldn't be there.
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#12 |
Senior Member
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Location: Vacaville, CA
Posts: 529
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Re: 1970 C/10 Brake Booster Bracket Question
I’d throw them on. I don’t know the real reason, just speculate to help with the pressure on the firewall. I had cracks on my firewall around the emergency brake mounts. Here is a shot showing how mine are mounted, you might have to zoom in. I’ll take a couple more when I get home.
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1971 Custom/10 - 350/3 speed, Orange/White roof Last edited by rechinca; 01-12-2021 at 10:15 PM. Reason: Details |
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#13 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,396
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Re: 1970 C/10 Brake Booster Bracket Question
Quote:
And yet, there are millions of trucks (like mine) that never had those brackets. We just haven't figured out the design criteria.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#14 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: 1970 C/10 Brake Booster Bracket Question
More info in these old threads.
https://67-72chevytrucks.com/vboard/...d.php?t=653806 https://67-72chevytrucks.com/vboard/...d.php?t=156683
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Jim |
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