Chris,
The dual master cylinder is a safety item and yes the lines are separate
systems for front and rear brake circuits. This means if you blow a rear
wheel cylinder (drum brake) the fluid is supposed to drain from one cylinder
only. In a single system if this happens, guess what? Fred Flintstone to the
rescue.
I just thought of a safety issue and that is not all dual master cylinders
have the front brake line nearest to the firewall so make sure you know
which is which before you connect things up, especially on other makes than
a Datsun. Some PBR units have the lines a about face (eg AMI Toyotas).
On the safety light thing, the inbuilt switch was very fluky as when you
bled only one circuit the damn thing would shift in the cylinder and
activate the light and these things were a nightmare to get repositioned in
the centre. You had to bleed both circuits an hope. Nissan replaced this
idea in the 180B SSS with a fluid level plunger in each reservoir and you
can tell if you have these by the wires attached to the reservoir caps. Most
cars still use some variant of this system today. If this frigs up you only
have to buy a new cap.
regards
Terry
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Chris Halpin
Sent: Thursday, 13 July 2000 2:18 PM
To: [EMAIL PROTECTED]
Subject: RE: 4 spot callipers
rick, my dato ('71) has dual reservoirs - well did have before I pulled them
out. As far as I know, the second was a safety unit, so where the first
fails, the second can pull the car to a halt safely, but I'm not saying that
they are for the front and back seperately, just saying what I heard. It is
also written in the gregories manual like that. The 180B booster has no
warning light leads coming off it as I know it (3/4"), where the 240K (7/8")
has the leads for the light. Maybe the model of 180B I have it different to
the majority, or maybe the wires were already taken out when I got them - I
don't know. Both 180B and 240K's have dual reserviors though.
chris
>From: Rick White <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: RE: 4 spot callipers
>Date: Wed, 12 Jul 2000 06:04:17 -0700 (PDT)
>
>Terry it is a Nabco system you talked about but it doesn't have the
>electrical cable joining them together but it seems to have two bleeder
>valves(well that is wot they look like.
>Please exuse my ignorance but wot is a prop valve??
>As I don't know wot I am looking for.
>--- "Terry & Heather" <[EMAIL PROTECTED]>
> > wrote:
> >Hi Rick,
> >
> >Some 1600's towards the end of the model run usually imported into
>Australia
> >like the wagon came with a 3/4" dual cylinder complete with a pressure
> >differential warning light. The Nabco variety has different reservoirs
>for
> >front and back, the front one (back brakes) is a perfect cylinder and the
> >rear res (front brake) in a shorter rounder affair. If it still has the
> >original cylinder there will be an electrical connection somewhere
>between
> >both reservoirs, also the original Japanese 510 system doesn't
>incorporate a
> >prop valve so if it has one it's been fitted ex factory.
> >
> >The dual cylinder also may have been fitted by an Aussie PO and if this
>is
> >case then it's more than likely a 180B unit.
> >
> >regards
> >
> >Terry
> >
> >-----Original Message-----
> >From: [EMAIL PROTECTED]
> >[mailto:[EMAIL PROTECTED]]On Behalf Of Rick White
> >Sent: Wednesday, 12 July 2000 9:51 PM
> >To: [EMAIL PROTECTED]
> >Subject: RE: 4 spot callipers
> >
> >
> >Hi there just a quick question.
> >In my 1600 WAGON it has two (yes two)reseviors for the master cylinders
> >which I can't find any info o about in my workshop manual.(manual is
>datsun
> >510 owners handbook and service manual published bye Floyd Clymer in Los
> >Angeles)
> >I guess one is for the front and one is for the rear has anyone used this
> >system with quod spots and R31 rear disks?
> >Are they compatable?
> >It is just an idea I have.
> >Any info would be good.
> >Thanks in advance.
> >Rick White.
> >
> >--- "Cameron Stean" <[EMAIL PROTECTED]>
> >> wrote:
> >>
> >>Hey,
> >> if you are going to do just the quad spots on the front you would
> >>probably want to try the 7/8 master cylinder, but when you go for the
>R31
> >>rear discs you may have to go up to a 15/16 master cylinder cus you may
> >have
> >>too much "freeway" in the pedal.... i have found that even the quad
>spots
> >on
> >>the front (havent put the rear discs on yet) there is a little bit of
> >>"freeway" in the pedal with a 7/8 master... so you really have to try
>for
> >>yourself and see what you feel comfortable with...
> >> Cameron
> >>
> >>
> >>>From: "Terry & Heather" <[EMAIL PROTECTED]>
> >>>Reply-To: [EMAIL PROTECTED]
> >>>To: <[EMAIL PROTECTED]>
> >>>Subject: RE: 4 spot callipers
> >>>Date: Tue, 11 Jul 2000 15:51:15 +1000
> >>>
> >>>"we tend to use the 1 small and 1 large pistons because you don't have
>to
> >>>use a bigger master cylinder"
> >>>
> >>>
> >>>That makes pretty good sense if you are considering going all the way
>with
> >>>a
> >>>R31 rear disc conversion.
> >>>
> >>>
> >>>terry
> >>>
> >>>-----Original Message-----
> >>>From: [EMAIL PROTECTED]
> >>>[mailto:[EMAIL PROTECTED]]On Behalf Of Cameron Stean
> >>>Sent: Tuesday, 11 July 2000 11:36 PM
> >>>To: [EMAIL PROTECTED]
> >>>Subject: Re: 4 spot calipers
> >>>
> >>>
> >>>
> >>>there are too types od calipers you can get..........
> >>>1- small and large piston
> >>>2-two large pistons
> >>>we tend to use the the 1 small and 1 large pistons because you dont
>have
> >to
> >>>use a bigger master cylinder
> >>>we have them for sale for $200 a set and reconditioned $400
> >>>if you are interested go to www.workin4u.com/zcarworkshop
> >>> cameron stean
> >>>
> >>>
> >>> >From: "Chris Halpin" <[EMAIL PROTECTED]>
> >>> >Reply-To: [EMAIL PROTECTED]
> >>> >To: [EMAIL PROTECTED]
> >>> >Subject: Re: 4 spot calipers
> >>> >Date: Mon, 10 Jul 2000 22:41:26 EST
> >>> >
> >>> >all this talk of hilux 4 spots, just wondering what years they are
>off,
> >>>and
> >>> >ifthey are expensive to buy from a wrecker or wherever?
> >>> >
> >>> >
> >>> >>From: "Cameron Stean" <[EMAIL PROTECTED]>
> >>> >>Reply-To: [EMAIL PROTECTED]
> >>> >>To: [EMAIL PROTECTED]
> >>> >>Subject: Re: 4 spot calipers
> >>> >>Date: Mon, 10 Jul 2000 18:15:56 EST
> >>> >>
> >>> >>
> >>> >>yes they do bolt straight up BUT like what i did i had to grind a
> >little
> >>> >>bit
> >>> >>of the head of the bolt down the bottom near the nuckle joint as
>when
> >>>the
> >>> >>car is at full lock the nuckle joint and the bolt hit...
> >>> >> cameron stean
> >>> >>
> >>> >>
> >>> >>>From: natas katas <[EMAIL PROTECTED]>
> >>> >>>Reply-To: [EMAIL PROTECTED]
> >>> >>>To: [EMAIL PROTECTED]
> >>> >>>Subject: 4 spot calipers
> >>> >>>Date: Sun, 9 Jul 2000 11:04:36 -0700 (PDT)
> >>> >>>
> >>> >>>
> >>> >>>
> >>> >>>Do these 4 spot calipers(Hilux) bolt straight onto the 240k strut!!
> >>>Does
> >>> >>>anybody know?
> >>> >>>
> >>> >>>
> >>> >>>
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