[Tigers] dual circuit master cylinder options?

[Gary Winblad]

I put in a mid '80s(?) or '70s(?) Ford Courier(Mazda) truck tandem 
master back 20 years ago.
I forget the exact details but pretty sure I used the adjustable plunger 
that used to come with Sunbeam Specialties replacement
stock master cylinders.  I think I rounded the push end an just put it 
into the Courier cylinder.  To prevent it from falling out
I was able to limit the possible rearward pedal movement by putting a 
stopper bolt in a hole that is in the stock pedal bracket.
The Courier bore is 3/4in and results in perfect pedal effort without a 
servo.  I have stock front brakes and Dale's old rear disc kit
using Fiat 124 calipers, Dale's carbon pads.
I had Paul Reisentz install the brake lines, he used a few hydraulic 
line adapters and new lines.
I added a mechanical brake light switch above the pedal too.
Has worked great for 20 years.
Photos attached (I hope)
Gary


On 4/16/2019 10:08 AM, Tom Witt via Tigers wrote:
> I adapted a Datsun 710 3/4” master cylinder. It was originally 
> attached directly to a booster and obviously in the Tiger it is not. I 
> poked around and found an adjustable push rod and rod capture piece 
> from a Volvo 122. The round capture piece was larger than the 3/4” 
> bore but I was able to grind its circumference down until it fit. Also 
> of note was that the Volvo rod end was more of a half round ball where 
> as the plunger socket in the master cylinder more of a taper. Likely 
> not an issue as the ball just stops at the appropriate depth of the 
> taper. It all fit well, and there was a subtle looseness so I know the 
> plunger was at the appropriate resting point.  I’d like to tell you 
> how well it has worked but 19 years (and counting) on jack stands 
> offers no proof of results.
> I believe this question has been asked before and someone directed the 
> party to a generic adjustable rod at one of the on line speed 
> equipment vendors.  Likely they will be easier than finding a Volvo 
> 122 push rod and modifying it. I say this assuming that the 280Z 
> master cylinder is similar to the 710.
> *From:* Richard Hyatt via Tigers <mailto:tigers at autox.team.net>
> *Sent:* Tuesday, April 16, 2019 6:58 AM
> *To:* tigers at autox.team.net <mailto:tigers at autox.team.net>
> *Subject:* [Tigers] dual circuit master cylinder options?
>
> HI,
>
> I wondered if any had converted their tiger to a dual circuit brake 
> master cylinder. If so, which type and year worked well for you. Two 
> issues seem to be plaguing my attempt to do this. I tried using a 1980 
> Datsun 280z master cylinder, This uses a loose rod to actuate it 
> meaning the brake deal must have a stop or a custom push rod and 
> modification to the master cylinder to keep the rod in place when 
> letting off the brake pedal. The second issue is that I had all custom 
> brake lines made for my conversion to Wilwood disks all around but 2 
> attempts to get correct flare/fitting combination at the new master 
> cylinder have failed. Still have leaks. Not sure if the supplier has 
> used proper flare and fitting despite the info I provided. Any 
> thoughts on a better arrangement? Thanks.
>
> Rick
>
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