Wynona the wagon's resurrection!

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DRIVEN
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Re: Wynona the wagon's resurrection!

Postby DRIVEN » Sat Dec 30, 2017 8:10 pm

Carbide
When the only tool you have is a hammer every problem starts to look like a hippy.
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Sat Dec 30, 2017 8:19 pm

So this is when I'm glad I'm older and possibly wiser. I got back from dinner, felt much better after eating. I was just getting ready to cut into the firewall, when I realized a problem. The mounting studs for the 280z booster are about 1 1/4" long, whereas the Maxima (to get through that big cavity with sound deadening and felt, are about 3" long. Whoops. Not going to work without some effort. I may end up ditching the booster after all. Going to search online now for different brake boosters that fit Nissan with a vertical mount master cylinder. Maybe I'll find a 720 one that will work or something similar.
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Sat Dec 30, 2017 9:39 pm

It looks like the wagon is not getting a brake booster due to the stud length issues. I'm thinking it's going to be set up like the Z car. 7/8 regular master cylinder mounted on a big plate. Annoyingly, the only similar master cylinder I can get is for '74 620s, which is the same master, but a 3/4 bore. If I use a 3/4 bore designed for manual brakes I have 226 psi for every 100 pounds of pressure on the pedal, whereas the 7/8 minus the booster is only 160 psi for every 100 pounds of pressure.

Of course, I can't find a new manual brake master for the 620, nothing but remanufactured.
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wayno
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Re: Wynona the wagon's resurrection!

Postby wayno » Sat Dec 30, 2017 9:53 pm

Centric are all new(no rebuilds), that is what I use in all my trucks, never had a bad one yet.
Sorry if I knew which box the 1979 620 master was in I would have a part number.

The number might be this one.

Centric 130.42303
Last edited by wayno on Sat Dec 30, 2017 10:00 pm, edited 1 time in total.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Sat Dec 30, 2017 10:00 pm

79 is a 7/8s, lol. I looked in my spare parts bin, have a brand new reman there I probably got 8 years ago. Still in the box. Same as the 280z one I have currently. Only the early 620s have the 3/4 master, no power brakes. I'm just going to use the 7/8s. Rose and I have strong legs, we're not scared!! :)
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wayno
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Re: Wynona the wagon's resurrection!

Postby wayno » Sat Dec 30, 2017 10:04 pm

I used the 79 brake master on the 73/74 620 booster in my 521 work truck, I believe it is the same master I used in the 521 kingcab diesel connected to a Ford Courier booster, but that was a while ago so I don't know for sure.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Sun Dec 31, 2017 6:20 pm

Yep, that sounds right, they're just all going to be 7/8 bore instead of the 3/4 bore I wanted. With a booster it'll work great. Without a booster it's just going to be harder pedal than usual, but it will stop just fine depending on how strong your foot is.
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Tue Jan 02, 2018 9:30 pm

Wayno, have you ever re-clocked a booster? I may disassemble the extra Maxima booster I have to see if it's possible. I'm only worried about re-sealing once it's apart. Much less, not sure if I have the tools to un-crimp it.
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wayno
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Re: Wynona the wagon's resurrection!

Postby wayno » Tue Jan 02, 2018 10:43 pm

No I just look around and find what I need, the 73/74 Datsun 620 booster works for most everything, but so does the Ford Courier booster, and the Ford Courier brake master has a remote reservoir, on my 47 Chevy truck the reservoir was 3 feet away from the master.
Here is the Ford booster/brake master in my 520 when it had a Weber.
Image

Image

Image
Here it is with Dual SUs, note the brake booster/master is where the clutch master used to be.
Image
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
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HRH
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Re: Wynona the wagon's resurrection!

Postby HRH » Thu Jan 04, 2018 7:19 pm

If I could remove my strut tower, it would work perfectly. ;) Got my piece of aluminum plate. 1/2" thick ought to do the trick, no more booster! Though I may still disassemble one for shits and giggles.

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