Factory Manual Brakes Question

J

JBsCamino

Not-quite-so-new-guy
Jan 5, 2016
37
4
8
#1
I went to the pick n pull today and got some parts off a wrecked 1978-1980 Malibu that I saw on a previous trip. It had what looked like a factory manual brake set up so I grabbed the master cylinder and block off plate.

The block off plate was a thin 2 piece sheet metal covering, and inside the car it was the skinny pedal from what would have been a manual car, but it was a column shift auto tranny.

Does that all sound correct that it is an original block off plate? Unlike the booster that has studs in the booster and then the nuts are in the passenger compartment, this had the studs in the firewall and nuts were in the engine bay. I wacked the studs quickly to see if they would come out and if there was another support plate on the inside of the firewall, but they were pretty stuck.

I would have thought that the firewall would have been a little thin to support pressing studs through.
 
J

JBsCamino

Not-quite-so-new-guy
Jan 5, 2016
37
4
8
#2
Here is a pic of the 2 piece sheet metal cover.


The car is also a factory bucket seat car if anyone in the MD, PA, DE wants a set of seats that are in rebuildable condition. It is also a factory heat only non a/c car, but the car isn't in a good spot to spend a few hours to get everything out.
 
Longroof79

Longroof79

Geezer
Oct 14, 2008
9,461
2,591
113
Gainesville, Fl
#3
You mentioned the studs coming thru the inside of the car rather than the other way around. Are the studs affixed to a steel plate, and then pushed thru the firewall?
 
J

JBsCamino

Not-quite-so-new-guy
Jan 5, 2016
37
4
8
#4
The car in the salvage yard was without wheels so it was really close to the ground and in a mud pit so I couldn't get in there and crawl up under the dash to see what the studs were attached to. I have a feeling maybe the brake pedal bracket was bolted to the firewall and the studs are pressed into the brake pedal bracket and then the studs go through the firewall to the master cylinder and block off plate.

I did manage to reach up and disconnect the pushrod and take it with me when I got the master cylinder since that is the special length. I am googling around and seeing maybe I can keep my existing brake pedal, but have the move the stud up and maybe there is another stud hole.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,515
4,237
113
Kitchener, Ontario
#5
G bodies didn't come with manual brakes. If that was an OEM plate there would be a part number stamped on it. Also when the top holes are used to install the mater brake cylinder the cylinder is sitting higher and not lined up with the brake pedal. You can see what I mean in this picture

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Last edited:
J

JBsCamino

Not-quite-so-new-guy
Jan 5, 2016
37
4
8
#6
I thought there was some on the early years. Rock Auto lists a manual brake master cylinder. I took a look and I do have a higher empty stud hole on my brake pedal of my el camino.
 
Garrett1982

Garrett1982

G-Body Guru
May 18, 2014
582
47
28
Uniontown, Pa
#7
I switched my car to manual brakes. I used a kit from manualbrakes.com. It does use the upper mounting hole for the pushrod. I would contact them, they sell individual parts and they could help you out.
 
O

oldsmobile joe

G-Body Guru
Nov 12, 2015
830
522
93
mpls
#9
i agree with pontiacgp, i didn't think these cars came with manual brakes. however, if they did, they would have positioned the pushrod higher up on the pedal, closer to the pivot, to gain more leverage for manual brakes. also , that two piece plate is complicated enough and symmetrical enough to say its factory. but i don't know why it would be two pieces. I've seen enough weird things in the auto world to never say never and never say always. anyone else out there with info or insight.
 
Garrett1982

Garrett1982

G-Body Guru
May 18, 2014
582
47
28
Uniontown, Pa
#10
The plate he has pictured does have the mc positioned higher to line up with the other hole in the brake pedal, just like the aluminum one I purchased. I don't know why it is two piece though.

http://www.manualbrakes.com/G-BODY.html
 

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