I think that you could do better with a newer style GM master cylinder.
The stock, factory original master cylinder is a step bore design with a 24mm pressure bore and a 34 or 36mm volume bore. The step bore master cylinder is used in conjunction with the from the factory, never been changed...
In my opinion, the wheel cylinders size is not that important. I believe the stock drum brakes should have plenty of stopping ability. I would add the wheel cylinder brackets to "lock" the wheel cylinder to the backing plate. With this type of wheel cylinder, they tend to move a little front...
Here is my opinion on master cylinders and calipers.
I do not like the 1982-1988 step bore master cylinders. I believe these master cylinders give you a spongy pedal because of the internal transition from a larger volume bore to a smaller bore. These are meant to work with LOW drag calipers...
Brian D’s 8 second, twin turbo, 5.3 LS G-Body Cutty with manual brake conversion.
https://www.manualbrakes.com/g-body.html
Buick Regal (1978–1987)
Chevrolet El Camino (1978–1987)
Chevrolet Malibu (1978–1983)
Chevrolet Monte Carlo (1978–1988)
GMC Caballero (1978–1987)
Oldsmobile Cutlass...
Customer’s G-Body MANUALBRAKES.com manual brake KIT install.
https://www.manualbrakes.com/g-body.html
If you have any questions about the install call, text, or email. 832-264-5566 or [email protected]
Brian D’s 8 second, twin turbo, 5.3 LS G-Body Cutty with manual brake conversion.
https://www.manualbrakes.com/g-body.html
Buick Regal (1978–1987)
Chevrolet El Camino (1978–1987)
Chevrolet Malibu (1978–1983)
Chevrolet Monte Carlo (1978–1988)
GMC Caballero (1978–1987)
Oldsmobile Cutlass...
When using the plug method, it lets you know that the master cylinder is holding pressure AND that there is no air.
If you are getting piston movement, then there is air OR the master cylinder is defective.
You can also try bleeding the master cylinder like a caliper: crack both plugs, push...
...and the outlet size for the line fitting going to the rear brakes is 1/2-20 instead of 9/16-18. The line fitting going to the front brakes is the same 1/2-20.
SUMMARY
Normal, left hand drive S-10: Both outlets on the engine side and both outlet sizes are 1/2-20 inverted flare.
Right hand...
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