Changing Booster and MC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big Blue · 10-21-2015, 08:45 PM

OK, Here is the question...................First the build up to the question. I have a 1979 Blazer frame, complete rolling chassie, Brakes, shocks, everything except the body. I am going to use the chassie to put a 1987 Cab on it and make a truck out of it. I am now starting to put things back together after about 8 years of off and on work on it. I picked up a lot of 87 parts over this time period. The one thing that I have a concern about is the Brake Booster came off a 1987 Suburban. THE QUESTION.....Drum roll please.........Will the 87 Suburban Booster and MC work my be using the 1979 Blazer Braking system? I going from this... Name: 1 Booster MC.jpg
Views: 141
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Name: 1 Booster MC.jpg
Views: 141
Size: 41.0 KB

To This..... Name: 2 BOOSTER MC.jpg
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Size: 13.3 KB

. I want to use the Newer Style. Thanks For reading.

John

enaberif · 10-21-2015, 08:55 PM

My understanding is no nothing is going to just bolt up. But if you don't mind doing some extra work it could possibly work.

Big Blue · 10-21-2015, 09:22 PM

Thanks enaberif, It seems to bolt up to the firewall. Everything looks like it matches up. I am just wondering if it will work,like stopping the truck

John

69heavychevy · 10-22-2015, 12:05 AM

I would say it should work.

I used an 85 c10 MC and booster on my 80 c10. The brake lines going from the MC to the Proportioning valve were different.

I had to use the ones from the 85 since the ones from my 80 wouldn't line up correctly on the MC. Everything works great with no issues.

KQQL IT · 10-22-2015, 09:26 AM

I just swapped to a later model master cylinder on my 73
The hole in the firewall was a bit smaller, used a hole saw and some tubing to open it up.

Big Blue · 10-22-2015, 01:57 PM

Sounds good so far 69heavychevy , KQQL IT....you said the hole in the firewall was a bit smaller, maybe that is why the plastic tube does not go into the firewall to well. I'll have to make the adjustment then. Thanks Again. John

KQQL IT · 10-22-2015, 02:30 PM

The vacuum booster could be the same, I swapped from power to manual using an 84 manual brake master cylinder.
And had to open up the hole a bit.

Shugalou · 10-22-2015, 03:21 PM

Also make sure the brake pedal hole is proper - may need to be lower or higher?

A pedal for non boosted vs boosted the hole is lower for the rod.

KQQL IT · 10-22-2015, 09:58 PM

My 73 was in the top hole, with the booster. Stopped great with 9" vacuum.

10-21-2015, 08:45 PM	#1
Big Blue Registered User Join Date: Feb 2005 Location: Northeast--Bethlehem, Pennslyvania Posts: 642	Changing Booster and MC OK, Here is the question...................First the build up to the question. I have a 1979 Blazer frame, complete rolling chassie, Brakes, shocks, everything except the body. I am going to use the chassie to put a 1987 Cab on it and make a truck out of it. I am now starting to put things back together after about 8 years of off and on work on it. I picked up a lot of 87 parts over this time period. The one thing that I have a concern about is the Brake Booster came off a 1987 Suburban. THE QUESTION.....Drum roll please.........Will the 87 Suburban Booster and MC work my be using the 1979 Blazer Braking system? I going from this... To This..... . I want to use the Newer Style. Thanks For reading. John __________________ Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in.

10-21-2015, 08:55 PM	#2
enaberif Registered User Join Date: Jan 2009 Location: Calgary, AB Posts: 1,181	Re: Changing Booster and MC My understanding is no nothing is going to just bolt up. But if you don't mind doing some extra work it could possibly work.

10-21-2015, 09:22 PM	#3
Big Blue Registered User Join Date: Feb 2005 Location: Northeast--Bethlehem, Pennslyvania Posts: 642	Re: Changing Booster and MC Thanks enaberif, It seems to bolt up to the firewall. Everything looks like it matches up. I am just wondering if it will work,like stopping the truck John __________________ Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in.

10-22-2015, 12:05 AM	#4
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	Re: Changing Booster and MC I would say it should work. I used an 85 c10 MC and booster on my 80 c10. The brake lines going from the MC to the Proportioning valve were different. I had to use the ones from the 85 since the ones from my 80 wouldn't line up correctly on the MC. Everything works great with no issues. __________________ 80 C10 SWB Step Side - 350 w/ vortec heads, TH350, 12-bolt 3.73

10-22-2015, 09:26 AM	#5
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,260	Re: Changing Booster and MC I just swapped to a later model master cylinder on my 73 The hole in the firewall was a bit smaller, used a hole saw and some tubing to open it up. __________________ " That didnt make it any newer " " Dont antique the equipment "

10-22-2015, 01:57 PM	#6
Big Blue Registered User Join Date: Feb 2005 Location: Northeast--Bethlehem, Pennslyvania Posts: 642	Re: Changing Booster and MC Sounds good so far 69heavychevy , KQQL IT....you said the hole in the firewall was a bit smaller, maybe that is why the plastic tube does not go into the firewall to well. I'll have to make the adjustment then. Thanks Again. John __________________ Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in.

10-22-2015, 02:30 PM	#7
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,260	Re: Changing Booster and MC The vacuum booster could be the same, I swapped from power to manual using an 84 manual brake master cylinder. And had to open up the hole a bit. __________________ " That didnt make it any newer " " Dont antique the equipment "

10-22-2015, 03:21 PM	#8
Shugalou Registered User Join Date: Jan 2013 Location: Toronto, ON Posts: 458	Re: Changing Booster and MC Also make sure the brake pedal hole is proper - may need to be lower or higher? A pedal for non boosted vs boosted the hole is lower for the rod. __________________ Found my dad's old truck http://67-72chevytrucks.com/vboard/s...d.php?t=563321 Newspaper Article Publishing the quest find my dad's old truck http://www.theglobeandmail.com/globe...ticle12494281/

10-22-2015, 09:58 PM	#9
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,260	Re: Changing Booster and MC My 73 was in the top hole, with the booster. Stopped great with 9" vacuum. __________________ " That didnt make it any newer " " Dont antique the equipment "



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