Manual brake system parts interaction.

The C-body booster confuses things – so I “X”ed out.

I have found no good pictures of a manual brake master cylinder vs. Power brakes – so I used and modified your picture.
brake-stepup-linkage-B.jpg

The Red is push rod. The Blue is location where master cylinder should be located at – which is a couple of inches lower than power master cylinder is at.

If your car has a cast iron master cylinder – it will be worth the weight loss to convert to an aluminum master cylinder (if applicable).
I think ’78 was last full year of cast iron and ’80 was first full year of aluminum master cylinders.

I’m fairly sure (but not 100%) that you can get undersize and oversize bore master cylinders as well as same for wheel cylinders.
Other than relocating existing master cylinder to correct holes – I think wheel cylinders would be easier to change out.

My suspicion is the previous owner used a power brake reinforcement plate instead of manual brake one. If so, I would make your own plate – for finding a manual reinforcement plate is not easy to do.
BudW
 
So the right diagram isn't F-body? I'll have to look if I can lower the M/C for a straight shot. But no time for this weekend. I'll just try the bigger M/C and see what happens. Previous owner already had the aluminum version. I'm going from Cardone car 10-1821 1.03" to a Cardone truck 10-1860 1.125"
 
F Body manual brakes have a plate on the firewall to mount the master cylinder so the pushrod goes into the interior to the brake pedal.
101_0029.jpg
101_0030.jpg
 
Locomotion said:
So the right diagram isn't F-body?
Click to expand...
There are two pictures side by side. The picture on Right (that I marked off) is for C-body and they have more space under the dash than the rest of the cars have.
The Left side picture is for B, R, F, M & J-bodies – from about ’66 to ’89.



Something I didn’t think about – but the stiffener plate that DCAspen posted, could be installed upside down.
He took a front and back photos (one with studs down and other with studs up).

A person could install the plate upside down (where studs go into the lower holes when they should be going into the upper holes).
BudW
 
It has been awhile – but the firewall hole is oval-ish and a fairly large hole.
I think a person could get it in there with that stiffener plate upside down, without much trouble . . . I think.
 
You must log in or register to reply here.
Back
Top