Master cylinders, which to use?
Turbo Mini Forums

Have been out in the garage again this eve and weighing up which parts under the bonnet of my turbo minus build will pertrude above the bonnet line (as the minus is 3"less in height, and all the parts in the bay affectivly seem higher in reation to bonnet) and found that the master cylinder I was planning to use sits above the bonnet will sit over an inch and a half into the bonnet,
My choices are, fit the original tin can, and convert to sigle line brake system.
Huge bonet bulge (not an option!!!!)
Have looked at these also, http://www.merlinmotorsport.co.uk/BRAKE-&-...oduct_info.html with remote resevoir.
and http://www.minispares.com/Product.aspx?pid=38017
I need a set up that is going to stop a potential 130 banana mini on 10"s!
What are your thoughts to a sencible solution? would really like to stitck to twin line system, has anyone used single?
your thoughts please
Shane.

Attachments:

18.74kb

Use AP Racing ones, I have these on my 150 banana MiniSprint. Theyre well upto the job.
Paul

I seriously doubt it!

shane, i have single tin can
single line 4 pot metro vented calipers

with the pressure bias valve from minispare at the rear

it stops on a sixpence (no servo either)

I'm not sure if I saw it in the Merlin or Rally Deisgn cats but I know I recntly saw a dual / tandem master cylinder for remote resoviors.

Also KAD do a bias set up that sits horizontal.

I normall try to run tandem front / rear split so that if I loose a line I still have some stoppers. Not unheard of for the rear flexis to suffer on a low Mini.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Paul, who stocks the AP items, and at what cost?
Roger, like the idea of duel better, not going to have the low car and brake line issue as they are all being ran internally.
Benross, is the can you have the 3"tall "s"/ GT item? also do have a link to the bias valve (please)
Thanks gents, appreciate it
Shane.

Out of interest does anyone know when dual / tandem set-ups become a legal requirement?

Thats a good question, my build is a '68 will this be a problem? I doubt it will as im sure i've seen newer cars running single line.
Shane.

shane i have just looked my memory is crap

severall years ago i fitted the new plastic master cylindar from minispares

its the one you have to fit the wrong way around ......lol

and i got a standard braking biast valve from a 70s cooper S

i believe minispares still do these have a word with richard at minispares north

Thanks benross, been sat here thinking some, and have realised i have already ran the pipework round the front subby for twin pipe set up, and am reluctant to change it, so am now thinking, as another option using the servo master cylinder set up from the (I think), 1990 on model (master cylinder into the bay rather than on top of cross member)
Do you guys think it is possible to use this set up, but less the servo (ie master cylinder to the linkage from the pedal box to which the servo normally mounts).
Space is of a huge premium in the bay of this build, and would also rather not to have a servo.
This is going to take some further head sratchin!
Thanks
Shane.

demon tweeks sell those ap cylinders,

you need 7/8 for the brakes and 3/4 for the clutch

Cheers Nic, is that single or twin line?
Shane.

errrr single...i think.../????

Every day is a school day ...........

How fast and how expensive ...... the same question...

Every day is a school day ...........

How fast and how expensive ...... the same question...

Every day is a school day ...........

How fast and how expensive ...... the same question...

The short answer is not really, the pedal ratio is quite different and the whole frame is a bit overly bulky.


Why not just fit a late front/rear split master and the valve that goes with it (4 pipe job on the bulkhead .... there to shut of a line that goes very low pressure)?????? Easy and very safe install and not going to intrude into the engine bay any more than a single line ........ I personally do not understand why anybody would run a single line system.[/quote]


That is the set up I was hoping to use (as per pic), but as its a minus shell, and is 3" less in hieght, (the 3" has been lost in the door skin area, so the gubbins in the bay sits closer to the underside of the bonnet) the master cylinder sits higher than the bonnet, hence me looking for a twin line servo, with remote resevior (that is less in height that the one I ahve) so I dont have to modify the bonnet.
I could just run single line system, with presure reg on the rear subby as Benross suggested, (and your post previos about flexis rubbing thru), I have braided lines fitted, so is this still an issue?
Whats the draw backs of single line, and how does it pipe up? at the mo, I have the pipes fitted to the front and rear subbys as per split line requirements, (nothing else has been done luckily, so now is the time to repipe if need be?) will this need to be altered??
Thanks
Shane.

Edited by shane on 16th Mar, 2007.

i'm also running a single line setup the same as benross, it splits on the bulkhead at a T piece in pretty much the same place as the bias valve on a tandem setup so your front and rear pipes should still be useable.

What about the front, at the mo, the line comes from the bias valve, to the top of the flesi (drivers side) runs round the front of the subby, to the the pas side flexi, if I run a single line system will the front subby be piped differntly? does the "t" for the rear brakes take off before or after the "t" for the front, is it like this? http://www.miniminus.co.uk/pictures/29%20-...ne%20-%2003.jpg
Shane.

Down side of single line is that loose one part of the system you use it all ..... resulting in a near certain trip to hedge!!!

Edited by RogerM on 16th Mar, 2007.

Every day is a school day ...........

How fast and how expensive ...... the same question...

LOL @ Roger!

These guys are good AP dealers. They know their stuff and can get hold of anything from AP quickly if they aint got it.

http://www.techcraft.co.uk

Thanks for that Richard will give them a bell next week. I think Im going to struggle to fit a twin line master cylinder (without using the off the baulkhead bulky I saw servo used on the later cars) due to my height restriction, I had a look at the AP twin line servo that my boss is running on his caterham, its a little longer than the item I was planning to fit.
I dont think I have too much choice other than a single line system (eek!!!), that or two single line servos and a balance bar, again space is the issue.
Shane.

AP do a few different styles of cylinder. You can use remote resovoir units to help keep your height down, but the res must be above level of the master cylinder.

http://www.apracing.com/car/cylinder/dataselect.asp

cheers again Richard if the ap unit is only say an inch less in height im gonna struggle then to get the resevoir higher, I think A realistic solution to my problem is either use, single line system or the later twin line servo assisted item (which I loath the look of, very unpleasing to the eye!)
Shane.