Jump to content


Photo
- - - - -

Z31 booster and MC on 240Z


  • Please log in to reply
15 replies to this topic

#1 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 03 April 2017 - 04:44 PM

So I have modified a Z31 dual-diaphragm booster and also bought the MC.

 

-The MC has 2 outlets though for the front brakes.

 

-Can I plug one of the outlets?

 

OR

 

-Do I need to plumb lines separately to the front calipers?

 

Currently I have:

 

Toyota 4 pistons up front

 

Mustang calipers rear

 

Thanks, GI

 

 



#2 Miles

Miles

    Miles ahead!

  • Donating Members
  • PipPipPipPipPipPip
  • 1888 posts
  • LocationSacramento, CA

Posted 03 April 2017 - 05:39 PM

Does your MC look like this?

 

 

Attached File  Ah2VPi2.jpg   71.95KB   0 downloads

 

 

What diameter piston does it have?

 

You do know that it is a fast fill MC.  See the bulge on the side.  Has to do with reducing pad drag on the rotors by using "low drag calipers". Google what a "fast fill MC" is. 

 

 

With your particular caliper combination you would need a 15/16in.  to  1in. diameter MC to flow enough fluid.

 

Search the brake and FAQ forums to see if another member has used this MC.

 

Opinion: Why would you do all of the unnecessary plumbing when tried and true bolt on solutions are available.

 

 

 

 

 


“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell


#3 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 03 April 2017 - 06:38 PM

It is a 15/16 bore MC.

 

-If the MC is not recommended, can I use the 280zx MC with Z31 booster.

 

- I have a ZX MC but thought the dual diaphragm would brake the car better since it will have a 3.0 liter in it.

 

-I just need to know if I can plug the one outlet and run the one to the 240Z  prop valve

 

Thanks, GI



#4 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 08 April 2017 - 06:52 PM

-I read up on the "fast fill MC aka Quick uptake MC".

 

- It does not say you can use  a non-low drag caliper with a fast fill MC.

 

-But, it did say you cannot use low drag caliper with a regular MC.

 

-So my question is:

 

-Can I block off one of the front caliper ports, since it has 2 for the front, and run it with regular calipers?

 

Thanks,

GI



#5 Miles

Miles

    Miles ahead!

  • Donating Members
  • PipPipPipPipPipPip
  • 1888 posts
  • LocationSacramento, CA

Posted 09 April 2017 - 12:38 PM

The only member I recall doing something like this is Tooquick260.  You might PM him or  google "Tooquick260"

 

If you do plug the outlet use a plug made for inverted flair M10 x 1.0.


“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell


#6 98blackbell

98blackbell

    Always Here

  • Donating Members
  • PipPipPipPip
  • 170 posts
  • LocationGa. Isle of Hope

Posted 09 April 2017 - 03:47 PM

We did the Z32 mastercylinder and booster, as well as the z32 front and year brakes.. We drove it for about 2500 miles and a couple events.

The booster from the z32 over powered the breaks and made them very touchy. Hard to modulate. Had to go back to the stock booster and m/c.

Seems the S30 is a lot lighter and does not need the over boost. The z31 may be ok. You can only try and see.

The z32 booster is bigger. Do you have a comparison in booster size.
Father to tooquick260, part time mechanic and co-driver.

Our build since 2012, never ending but soon to be a master piece.
http://forums.hybrid...echnotoytuning/

#7 98blackbell

98blackbell

    Always Here

  • Donating Members
  • PipPipPipPip
  • 170 posts
  • LocationGa. Isle of Hope

Posted 09 April 2017 - 03:51 PM

Comparison, s30 left and z32 right.

Attached Files


Father to tooquick260, part time mechanic and co-driver.

Our build since 2012, never ending but soon to be a master piece.
http://forums.hybrid...echnotoytuning/

#8 Miles

Miles

    Miles ahead!

  • Donating Members
  • PipPipPipPipPipPip
  • 1888 posts
  • LocationSacramento, CA

Posted 09 April 2017 - 04:17 PM

A one inch Wilwood MC paired with a 280Z booster is what I am using with the Toyota - 240SX combination. Pedal is not stiff. Just feels like normal power brakes.

 

Originally used a 280ZX MC with stock 240Z booster, but the pedal was too stiff.

 

There are several posts here and at ClassicZcars.com describing the 280Z booster swap.

 

 

 

Attached File  280Z Booster 8.5 in. dia.jpg   89.46KB   0 downloads


Edited by Miles, 09 April 2017 - 04:42 PM.

“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell


#9 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 11 April 2017 - 06:50 AM

The Z31 booster is the same diameter as the 73 z, just dual diaphragm. I hesitate with wilwood product quality is why I haven't looked at their 1" MC.
Thank you,
GI

#10 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 15 April 2017 - 07:54 AM

So I have the 15/16" ZX MC mated up to the Z31 booster but the BB to MC pin seems a bit short. I usually run .020" clearance but with the original MC spacer/mount I am not even close. Does anyone make a longer rod that is adjustable?

 

Thanks, GI



#11 Miles

Miles

    Miles ahead!

  • Donating Members
  • PipPipPipPipPipPip
  • 1888 posts
  • LocationSacramento, CA

Posted 15 April 2017 - 10:46 AM

Did the reaction disk fall into the booster?

 

 

Attached File  Booster plunger with seal and reaction disk.jpg   119.35KB   0 downloads


“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell


#12 NewZed

NewZed

    Clandestine Moderator

  • Donating Members
  • PipPipPipPipPipPipPipPip
  • 5362 posts
  • LocationWashington County, Oregon

Posted 15 April 2017 - 10:58 AM

 

-So my question is:

 

-Can I block off one of the front caliper ports, since it has 2 for the front, and run it with regular calipers?

 

Thanks,

GI

It's gotta be two ports just to handle the fluid volume that the calipers use.  Blocking a port should work.  But, as noted, you're kind of reinventing one of many wheels.

Attached Files



#13 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 16 April 2017 - 12:38 PM

NewZed,

 

-that makes sense about the amount of fluid for the calipers.

 

-I am extending the booster to MC pin since the 240z booster spacer make the MC sit too far out.

 

-I will post some pics soon.

 

Thanks,

GI 



#14 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 26 April 2017 - 07:09 PM

What if I run lines directly to the front calipers and plug off the prop. valve at those three sites and run a line from the MC rear port to the prop. valve rear inlet?

GI



#15 Miles

Miles

    Miles ahead!

  • Donating Members
  • PipPipPipPipPipPip
  • 1888 posts
  • LocationSacramento, CA

Posted 26 April 2017 - 09:41 PM

Because Z brake systems changed year to year, you need to tell us what year Z you have.

 

Post some pictures of what you are calling a "proportioning valve"  would help.


“Life is like arriving late for a movie, having to figure out what was going on without bothering everybody with a lot of questions, and then being unexpectedly called away before you find out how it ends.”    -Joseph Campbell


#16 GIchiro

GIchiro

    Newbie

  • Members
  • Pip
  • 18 posts
  • Locationnorcal

Posted 09 May 2017 - 07:15 PM

I have a 1973 with the wheel well mounted prop valve and then firewall mounted that feeds passenger front brake and rear brakes. I have been able to mount the stock 15/16 ZX booster to the Z31 brake booster. I made new lines for that. I did by an adj. prop valve.

 

-Is the firewall mounted proportioning valve a "damper" device of some sort. I do not know why there would be 2 proportioning valves. I did take it apart and cleaned it (wow was it nasty, both of them actually).

Thanks, GI






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users