few brake Q:
Turbo Mini Forums

What brake setup do Miglias use?
What size master cylinder does the metro turbo use?
how do i work out what size master cylinder/s are req in relation to piston and slave cylinder sizes and the amount of fluid that needs to be moved?
when looking at master cylinders i see that they are listed as 5/8 15/16 3/4 ect ect is there a table that converts to .625 .7 .750 ect ect


cheers

Doh im a bit Fik

Getting the master cylinder sizes right is a bit of a fiddle, needs some educated guesswork to get it right, on the 205 I have a 3/4 front and 7/8 rear master cylinders. However the caliper piston size areas are more evenly matched. On a Mini you are quite likely (esp with 4 pot calipers) to have approx 5 times the area at the front than the rear of the car.

REMEMBER it is PRESSURE GENERATED you need to think about, not volume of fluid you need to move. It does take a bit of getting your head around.

.625" front (ap 4 pots) .750" rear (drums)

On a metro

Metro turbo weekend driver,Mini turbo in the making again!

as for the miglia setup-

Mine has KAD 4 pot 7.9" vented front discs, minifin rear drums (although these wont do a lot!), remote reservoirs and seperate AP cylinders for front and rear.

Probably be able to dig some photos out from somewhere.

oh yeah and obviously a custom peddle box, or possibly could be standard off something, not sure. not something i've looked at too much!

it sometimews comes down to trying it and seeing if its too hard or not firm enough ,and then changing it for the better after finding out whats wrong , a smaller dia master would give a softer or more snsitive brake pedal , a larger dia would give a harder pedal .but untill you try it its sometimes hard to know whats best.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Or use the formula that I found,bit mind blowing

The following information and calculations were obtained with reference to the Brake Handbook by Fred Puhn:

GTD 40 I = wheelbase (95").
Rft = Rolling Radius of Front Tyre (12").
Rrt = Rolling Radius of Rear Tyre (12").
FF = Vertical Friction Force On Both Front Tyres (1328 lbs).
FR = Vertical Friction Force On Both Rear Tyres (1172 lbs).
Weight Of Car = 2500 lbs.

The following information is difficult to obtain so a typical or approximate value must be used:

N = Coefficient of Friction of Tyres = .75
dm = Maximum Deceleration = .75 G
Ycg = Height of Centre of Gravity = 21"
N1 = Coefficient of Friction of Pads = .3
Front Brake Torque = (N x FF x Rft)/2 = 5976 "/ lbs

Rear Rrake Torque = (N x FR x Rrt)/2 = 5274 "/lbs

Front Caliper Piston Area = 8.547 sq"
Rear Caliper Piston Area = 7.065 sq"

Front Max Hyd Pressure = (Brake Torque)/(N1 x Total Caliper Piston Area x Effective Brake Radius) = 460.5 psi

Rear Max Hyd Pressure = 553 psi

Now, the maximum brake torque both front and rear is known, also the hydraulic pressure is known and the caliper must be able to operate safely at these pressures.
Next, we have to determine:
1). The pedal ratio; and,
2). The master cylinder size and pressure.

Metro turbo weekend driver,Mini turbo in the making again!

KAD do a reasonably priced twin cylinder pedal box, might be worth a look

I've seen the future and tbh its Pie

yeah think its 150ish and direct fit although not 100%.

see they have an online shop now though. not the easiest thing to navigate but i managed it eventually!

thats perfect Iain just what i wanted really, its what i wanted to try and make myself but to be honest it would have cost me that

1012280 pedal box
1012281 2 integral reservoir master cylinders
1012282 cable adjuster




cant see costs though

Adjustable bias pedal box unit

Adjustable bias pedal box unit

Price:
£143.33 (excl. VAT)
£168.41 (incl. VAT)

then the cable adjuster is optional (£35)

then not sure it includes the cylinders or not.

But still not silly prices. if you go on the website they have fitting instructions you can download now.

added to the xmas list!!

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

the cylinders are about 25quid each or summat, hardly worth batting an eyelid.

however a big word of caution... durnig setting his car up a friend found a tree, setting them up is NOT something to be taken lightly or brushed off as simple... if your not sure you should be asking for help.

only trying to help, most definatly not trying to imply anything or offend!

Edited by andeh on 23rd Nov, 2006.

I've seen the future and tbh its Pie

ooo that must have stung .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

that must have been fun! look where the tree hit

was he ok?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

he was a lucky sob, but yeah hes ok

I've seen the future and tbh its Pie

Piss poor wiring!

On 23rd Nov, 2006 andeh said:

Edited by Sprocket on 2nd Dec, 2013.