Dual brake master cylinders as in 2 anyone do it?

[PROCRAFT]

We made kits back in the stone age that used the rotor I spoke of with a 2 piston caliper and the stock hub spindle John Sybrandt still races one of our kits on his Tiger

 

[Dan Moore]

Hi Barry
Check out Brian Holums web page tigre here on the site I used it on My car and it works good http://www.myturboalpine.com/
Dan

 

[Barry]

I responded to Jim Nichols who suggested using a vented rotor with a "spaced" Alpine caliper.

I specifically stated "..., the problem is making any of them work with the Alpine spindle, Alpine hub, Alpine caliper and especially the Alpine caliper location."

The picture PROCRAFT posted does not use an Alpine caliper, does not use the Alpine caliper location and the rotor is a lot bigger than 10".

Brian Holum's solution does not use an Alpine caliper, does not use the Alpine caliper location and the rotor is a lot larger than 10".

Again, my response was very specifically directed to a post about using a vented rotor with a "spaced" Alpine rotor on an Alpine. It had nothing to do with larger diameter rotors, relocated calipers or non-Alpine calipers.

 

[Toyanvil]

I got the inlets today, and they look like they will work.

 

[DanR]

Is there a vented 10" rotor that fits the Alpine hub and lines up with a "spaced" Alpine caliper?

Now that would be a "Nice" arrangement for our Alpines

 

[260Alpine]

Toyanvil, What do you plan for reservoirs? VW dealers used to carry nice blue brake hose.

 

[Toyanvil]

I am hoping to use the stock reservoir set up, maybe add one more or use a 3 way fitting.

 

[dmich2]

John,
I'm using a dual master from a Nissan F-10. I sourced it from Rock Auto, if memory serves.
Here's a shot of it in the car with the V6.

Cheers!
Steve

Steve. Where did you source the individual reservoirs for your master cyl? I don't see them listed on the Rockauto site?

Dennis

 

[sunalp]

Hi Dennis,

I had actually purchased another master ( also a dual or tandem) that had those reservoirs on it.
I was going to use it but the outlets were on the bottom and it fouled on the steering box.

I would search Ebay, but I'm sure that someone must sell these.

Cheers!
Steve

 

[jzuk7]

Toyanvil, do you how long the mazda MC is? Or the distance from the MC mounting face to the center if the outlets? It is hard to determine if the mazda MC will fit in my car without having the MC in hand. Not only is the valve cover in the way, but the oil dipstick is there too. I'll get around to moving it to the front of the engine when I pull the engine.

I thought I struck gold when I looked at a MC for a mid 70s Nissan b620. It has a 3/4 in bore, and tandem outlets. But the outlets are on the bottom. I can't find the length of the MC, but I assume it would put the outlets right on top of the steering box. Does the stock MC spacer need to be used on any of these MCs? If not, maybe this MC could fit. Although I assume this MC has been tried already.

I received the banjo fitting today, and they worked great. The bolt is 10mm x 1.25 and banjo is 3/8 24 inverted flare out. I also made a push-rod from a grade 8 bolt. jzuk7 with the fitting it is a little over 2 1/2 inches from center to outside of bolt, you could gain an 1/8 inch with a smaller headed bolt. Remember I am running a Miata motor and have a lot of room on the motor side.

 

[Bill Blue]

I wonder if a person could turn the MC upside down? Don't see why not. Rig up a remote reservoir, unless the fluid lines foul the steering column.
Maybe worth a look.
Bill

 

[Toyanvil]

For the V6 guys, I think I would look at a bell crank system and just move the M/C parallel to the fire wall away from the motor.

 

[Toyanvil]

jzuk7
The distance from the MC mounting face to the center if the first outlet is 3 3/8" and 5" to the second 5 3/4" total.

 

[Ken Ellis]

Upside down would be interesting. Perhaps canted at a 45-degree angle? With remote reservoirs, it could present a fitting-free side to either the bottom or the side. Jeg's offers a somewhat generic 90-degree adaptor, but other angles are easy enough.

 

[Barry]

My understanding is that any air bubbles in the MC need to be able to rise into the reservoirs when the MC piston(s) is fully retracted and the reservoir port(s) is open. Slightly tilted might still work, but...

Seems like having the discharge port(s) on top would result in any air bubbles being pushed into the brake lines rather than escaping back into the reservoir(s).

 

[Bill Blue]

My understanding is that any air bubbles in the MC need to be able to rise into the reservoirs when the MC piston(s) is fully retracted and the reservoir port(s) is open. Slightly tilted might still work, but...

Seems like having the discharge port(s) on top would result in any air bubbles being pushed into the brake lines rather than escaping back into the reservoir(s).

Well, top brake line outlets are used, in fact, they are currently on my car.

I can see the argument that the bottom inlet would not allow bubbles to return to the reservoir. While bleeding the system, air would be forced out the wheel cylinders, no problem. Are air bubbles an issue during normal operation? As you might guess, I have no idea what that answer may be. Well, it is either "yes" or "no". Beyond that, I'm lost.

Bill

 

[Barry]

Don't remember ever seeing an OEM setup with bottom inlets and top outlets, but you certainly have the miles to show that it works.

 

[Toyanvil]

Sunbeam's are top outlet so is the Toyota Prius I started with.

 

[Barry]

For the V6 guys, I think I would look at a bell crank system and just move the M/C parallel to the fire wall away from the motor.

What "V6 guys" problem would a bell crank system solve?

 

[Toyanvil]

Outlets on the right side hit the valve cover.