Disc/drum MC on a Drum/drum car?

I'm getting ready to do the brakes on my Dad's '41 Plymouth and it's drum front and rear. Can I use a disc/drum mc on it? I'm thinking no but amazingly, I don't know everything.

Thanks.

 

You might be able to get away with it but I wouldn&#8217;t recommend it. A disc/drum Mc has two pistons in it that push different amounts of fluid so you might have problems with one set of brakes applying before the other. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>

 

The disk part of the master cylinder will lack the residual pressure valve used with drum brakes.

Bob

 

Not TRUE!! unless it is one for the low drag metric GM calipers.

 

I've been searching for answers about how to set up a brake system and was given this link, it's a short read but very informative:

http://ecihotrodbrakes.com/brake_facts.html

It should help. Do a search of the HAMB there's a lot of information already posted.

 

Using a disc/drum master on a drum/drum system is a good idea. They are more plentiful with more choices, there's no question about which port (chamber) goes to the fronts (larger), and you're ready if and when you upgrade to front discs.

Re: Disc/drum MC on a Drum/drum car?



<HR style="COLOR: #e5e5e5; BACKGROUND-COLOR: #e5e5e5" SIZE=1>"You might be able to get away with it but I wouldn&#8217;t recommend it. A disc/drum Mc has two pistons in it that push different amounts of fluid so you might have problems with one set of brakes applying before the other. fficeffice" /><O></O> "

Not true. Fluid volumn might be different, but the pressure is the same out of both pistons.

Re: Disc/drum MC on a Drum/drum car?



<HR style="COLOR: #e5e5e5; BACKGROUND-COLOR: #e5e5e5" SIZE=1>"The disk part of the master cylinder will lack the residual pressure valve used with drum brakes.

Bob"

No quarantee a drum/drum master has residuals, as they were gone by the early 70s, and are not found in many new/rebuilds. It's a simple matter to add residual(s) if needed

 

There is nothing magic about a disk vs. drum M/C as far as the pistons go. Yes, disk M/Cs have a larger reservoir, but that is irrelevant as far as the hydraulic function of the M/C operates. All that matters is the diameter of the piston. The volume of fluid is controlled by the size of the wheel cylinder or caliper, not the M/C, so long as the M/C does not bottom out. Assuming the M/C has the same diameter pistons for front and back (and nearly all do) then the only issue is the piston diameter vs. the wheel cylinder diameter - period. This is a very simple hydraulic system design problem.

Now, an M/C with different diameter pistons will not work in this application, but those are few and far between.

 

Not sure why you're quoting me, but my point about using a disc/drum master (farther up) is availability and obvious (larger) chamber that goes to the fronts, as most drum/drum master chambers appear the same when in fact the pri. and sec. strokes (volumns) may not, and the fronts should always have the larger volumn.
Maybe trying to answer 3 quotes on the same post wasn't the best thing for me to do.

 

If you use a '67 Mustang drum/drum master you won't need a metering block or have anything else to worry about.

 

If it m/c is to be located below the floor, be sure to read the ECI thread quoted above.

 

Non-power drum/drum dual cylinder master cylinders were used on virtually every make during the changeover period from about 69/70-75 before drum front brakes disappeared.
Ford/GM and Plymouth/Dodge are still available new from your local auto parts stores. Power cylinders should also be available.

 

Dual master cylinders were mandatory starting in 1967 on all US cars/lt. trucks. Many drum/drum masters appear to have equal fluid chambers, but are not 50/50 in volume out, and unless you know for sure the correct frt/rear plumbing for the master you have, a displacement problem could result. That's why using a late 60s/70s disc/drum master takes the guess work out of it by having the front chamber obviously larger.

 

find a late 60's mopar that had drum drum (cuda, challenger etc..) and pick up that MC. I am using a late 60's truck MC in mine

 

Don't want to start another thread on this, but after reading this one, i'm still confused.

Is it okay to run a disc/drum MC on a drum/drum car?

I want to replace the single reservoir MC on my 1964 c10 (for safety sake) and since i'll eventually do a disc brake swap in the front, can I run a disc/drum MC in the meantime with my drum/drum truck until I have time to do the swap?