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Brake master upgrade

bobbo

bobbo

Donation Time
Looking to upgrade to a dual master brake cylinder. Dan R had sugested to me a Cardone part I can't locate here in Canada.
I've seen some suggesting a Datsun Z240 ..260 master as a replacement. Have any of you tried this master, will it work and any issues with the install?
Thanks Bob
 
Series Alpines without a brake booster used a master cylinder with either a 0.700" or 0.750" master cylinder bore.

IIRC, both the '78 Ford Courier and 240 / 260 Z tandem master cylinders have a 0.875" bore which will result in a considerably (about 36%) higher brake pedal effort compared to a 3/4" bore.
 
Thanks gentlemen for your input. I don't think I need more exertion on the pedal, so any suggestions for à readily available Master with the smaller bore would be appreciated.
 
I am using one from a 1975 B1600 Mazda pickup that is .75. If you have a V6 it may hit the valve cover. It was easy to install, I just needed to make a rod and remove the check valve for the drum brakes that holds some pressure on the lines. I also installed a proportioning Valve to adjust my rear disc brakes, it also has 1 into 2 outlet for the front brakes and a brake light switch.
RIMG0542-XL.jpg

RIMG0573-XL.jpg

RIMG0593-XL.jpg
 
Looks like a fine set up. I don't know a lot about brake mechanics, so do I need a proportiong valve for the standard set up? Front rotors and drums on the back. The brake servo has also been removed from my system.
 
bobbo said:
Looks like a fine set up. I don't know a lot about brake mechanics, so do I need a proportiong valve for the standard set up? Front rotors and drums on the back. The brake servo has also been removed from my system.
Click to expand...

Proportioning valves are typically used to address an imbalance in front / rear braking force. If your current braking force distribution is OK with the original single cylinder / single output MC, it should also be OK with a tandem cylinder / two output MC. Toyanvil has rear disc brakes which develop more braking force than the factory rear drum brakes and used a proportioning valve to prevent rear brake lock-up.
 
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Expect I'll go with the Dormam m96583. As Barry mentioned with the. 875 bore I'll need to push a little harder, but that should be OK.
Readily available here in Canada and it comes with reservoirs.
Thanks to all and cheers.
 
About 1/3 harder if 13/16" The one you mention is 7/8", so a lot harder. I'd look around for a 3/4". Ebay would be a good place to look. You can get a 3/4" version of that one on Rockauto. If you are V6 the bottom outlets won't work, they will hit the valve cover and you probably need banjo bolts to clear the steering.

 
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Toyanvil said:
The 1975 B1600 Mazda pickup M/C .75 works great with the same feel as stock and easy to find. It also comes with the reservoir, I did not use the reservoir because I used the stock series 2. here's a link 1975 B1600 Mazda pickup M/C
RIMG0609-XL.jpg
Click to expand...
Beautiful setup @Toyanvil . I've just picked up a 62 Alpine (also own a 94 miata with an M45 Supercharger), so I love the combination! Dual master seems like a no brainer, so i've ordered the B1600 master like you did.
Where did you get those inlet caps that go on the master? I'm having a heck of a time finding them. Only ones I see are wilwoods and Tilton, but it looks like those are meant to go on the OD of a resevoir.

Thanks!
 
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Heck ya. Thanks for the link, ill order some. Actually just got the master in today, earlier than expected. It does interfere with the intake, however after a bit of head scratching, I see no reason why I can't clock it by 30-45 degrees and redrill the 2 mounting holes. Only initial point of concern would be leakage at the resevoir inlet, but seeing as it always has fluid on the seal in a vertical application i dont see why it would make a differnece clocked a bit. Roughly placed in that position it looks like an excellent fit.
 
One thing to know is the Mazda M/C is for a 4 wheel drum brake vehicle so it has a valve to hold a little pressure in each outlet. You will want to remove the valve from behind the front outlet for your disc brakes. I have 4 wheel disc brakes on my Alpine, so I removed both. It's easy to do, just remove the outlet fitting and remove the valve.
 
Been using the Ford Courier/Mazda M/C for Decades

on the Tigers.

I like it a LOT!

The last time they where on sale

I bought 6 !

I picked it because the line output is mostly

out of the way, not sure of all the Alpine

configurations... look over the line routing...

I have been using them Without removing

the residual valves, they work fine.

I did try it without the res valve but I

found it added to the peddle travel.

So, out of the box works well.

They have 3/4" pistons, go larger for

a firmer peddle.

DW
 
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So, rookie mistake. The master brake cylinder I purchaced ( datsun 240 260 z ) is far too long to fit. It's around 7 inches long and there is only about 5 to 5 1/2 inches of space before bumping into the Stromburg carbs. Perhaps this is more suited to a converted car. Does anyone have a pic of a dual master in a SV with the 1725 engine.
 
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