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Dual circuit brake systems
https://www.ausmini.com/forums/viewtopic.php?f=2&t=5787		 Page 1 of 1
Author:  998_Clubman [ Thu Mar 24, 2005 3:32 pm ]
Post subject:  Dual circuit brake systems
ok guys im just about finished with everything with the gti conversion, motor is going, i have finally managed to make a bracket and clutch arm, now i have a clutch :D

i have one cv at the moment, and all i need is brakes, now i bought a dual circuit master cyl and proportioning valveoff cazmo a few weekends ago, had to send them away, prop valve was seized, but was only $433 later :shock: but thats all resleeved and kitted, and they even painted them to! the top secion of the MS was also seized, had to get that sent away aswell, but at least everything is new now :? the only problem i have is i dont know which hole goes where, theres the 2 on the MS, and i think 4 on the prop valve.

i have a brand new, well reco'd VH44 booster, which i have to plumb in also.. has anyone got any pics of the setups? which pipe goes where etc? and is there is a brake line going to each rear wheel also?? looks like ill need to do something about that to!

thanks in advance!
Author:  WhoDat [ Thu Mar 24, 2005 4:53 pm ]
Post subject: 
A lot of your questions are answered in the Braking systemems section of the haynes manual here - http://www.coopermania.it/0646-09.pdf

Cheers Dat
Author:  998_Clubman [ Thu Mar 24, 2005 5:51 pm ]
Post subject: 
oh ok thanks dat, i have 3 workshop manuals here and none even mention the dual circuit system, obvuisly to old,

cheers :)
Author:  13secmini [ Thu Mar 24, 2005 7:12 pm ]
Post subject: 
$433 :shock: i didnt even fit the proportioning valve on mine,, run one line from the master to your vh44, then run that line from it to a T piece, then run them 2 to the front calipers...

The other line runs thru a brake light switch then to the rear brake line.
Author:  drmini in aust [ Thu Mar 24, 2005 7:29 pm ]
Post subject: 
13secmini wrote:
$433 :shock: i didnt even fit the proportioning valve on mine,, run one line from the master to your vh44, then run that line from it to a T piece, then run them 2 to the front calipers...

The other line runs thru a brake light switch then to the rear brake line.

Brad, are you sure you have not got a standard pressure limiting valve on the rear subframe? They were on early Clubbies, like yours. :wink:
Author:  13secmini [ Thu Mar 24, 2005 7:44 pm ]
Post subject: 
i could have kev,, the guy that made the brae lines up said i didnt need it so i just assumed it was fine.
Author:  drmini in aust [ Thu Mar 24, 2005 7:59 pm ]
Post subject: 
I know you have 5/8" S rear wheel cylinders now, but, without a limiting valve or balance valve of some sort, there's no way the rears won't lock up.. :lol:
Author:  998_Clubman [ Fri Mar 25, 2005 9:13 am ]
Post subject: 
yeah it was $433 for the master cylinder, and the prop valve to be reco'd.. it was like $260 or somthing for the prop valve.. you think i should just ditch it?

anyone wanna buy a recod prop valve for $270? :(

and you've have no problems brad? :oops:
Author:  13secmini [ Fri Mar 25, 2005 12:52 pm ]
Post subject: 
crap mate thats not cheap,, my master cost $50 to reco, the kit to do it yourself is $25. As for the proportioning valve i wouldnt have a clue what they are worth to reco, but $270 sounds a heap of cash,,,, What model clubman do you have?? as kev said the early 72,73 models had a pressure limiting valve at the rear.
Author:  998_Clubman [ Fri Mar 25, 2005 2:08 pm ]
Post subject: 
they resleeved everything, stainless or copper sleeves, not so sure, i got it done through work aswell, (trade price) from abs..

not to sure wtf is going on, might have to have a chat to them about it.. but yeah.. i do have a pressure valve on the rear subframe.. well i think it is, ill have to have a look on tuesday.. but hmm ill be having a look to see if they actually resleeved it :roll:
Author:  Chris [ Fri Mar 25, 2005 2:30 pm ]
Post subject: 
IIRC the late model dual line master cylinders were worth a fortune to kit even when new, being a far different proposition to the earlier cylinders. I think when new, the kit was nearly a hundred dollars. Resleeving any master cylinder in SS will cost at least $100. I don't think the cost is ridiculous.
Author:  TheMiniMan [ Fri Mar 25, 2005 6:45 pm ]
Post subject: 
That late model brake brake valve doesn`t "limit" anything,,,it`s simply a safety valve,,,the floating piston will sense a leak or a problem in the system & shut that side of it off,,,that`s all,,,it won`t "limit" brake pressure at all.

the smaller rear cyls are all that`s needed as the rear section of the master cyl is sized to suit.

the early "single" systems did use a limit valve tho, mounted on the rear subfram & also acted as the "T" piece as well...late minis just had the "T" piece fitted in that same place.

& the later tandem system mokes went to an "inertia" type valve mounted on the drivers side of the rear subframe
Author:  998_Clubman [ Fri Mar 25, 2005 7:35 pm ]
Post subject: 
i think i should have asked about this before i got it rebuilt :oops:

so i dont really need it then hey? :cry:

i can re sell it if need be, and get most of my mony back, so should be ok.. :cry:
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