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Rear wheel cylinders
https://www.ausmini.com/forums/viewtopic.php?f=2&t=73110
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Author:  willy [ Sun Sep 18, 2011 11:36 pm ]
Post subject:  Rear wheel cylinders

For a dual circuit system, which rear brake cylinders are the size to go for?

The master cylinder will be this:
"MASTER CYLINDER FOR 1980 ON PRE SERVO (YELLOW IDENTITY TAG)"
http://www.minispares.com/Product.aspx? ... 659&title=

... the rear line will be going through a hydraulic handbrake (with 5/8 master - is this suitable?) and then to the rear wheel cylinders.

Any help appreciated.

Author:  DA9jeff [ Mon Sep 19, 2011 12:02 am ]
Post subject: 

We have a .70" m/cylinder on our Hydraulic hand brake... thought the rear cylinder should be bigger,not smaller than the front???

...the smaller the cylinder for a given pedal movement equals more line pressure...you want less line pressure on the rear brakes for obvious reasons [or a bias valve.]

Author:  drmini in aust [ Mon Sep 19, 2011 7:49 am ]
Post subject: 

DA9jeff wrote:
We have a .70" m/cylinder on our Hydraulic hand brake... thought the rear cylinder should be bigger,not smaller than the front???

...the smaller the cylinder for a given pedal movement equals more line pressure...you want less line pressure on the rear brakes for obvious reasons [or a bias valve.]

This is right for a MC, but the opposite applies for a slave (ie rear wheel) cylinder. You want less area on the piston to get less applied force to the shoes, so fit 5/8" diameter wheel cylinders as used on Cooper S and GT.

Most drum braked cars here had 3/4" rears. They can lock up after you fit front discs (as I found out at 110KMH once in the wet...) :shock:

Author:  willy [ Mon Sep 19, 2011 4:45 pm ]
Post subject: 

Cool so 5/8 if it has disc brakes up front - they are 8.4" if it matters.

And on that note, is the 5/8 MASTER cylinder of the Hydraulic handbrake OK size wise?

8)

Author:  drmini in aust [ Mon Sep 19, 2011 7:07 pm ]
Post subject: 

5/8" master cylinders are most uncommon- they were used on 998 Coopers and on nothing else.
Worth $$$ for rarity, if you have one.
I'd fit a 0.7"MC, they are easy to get. :wink:

Author:  willy [ Wed Sep 21, 2011 9:11 pm ]
Post subject: 

I meant the handbrake master, is 5/8".

So 5/8" wheel cylinders for the rears with my 8.4" disc brake setup, yeah?

Author:  drmini in aust [ Wed Sep 21, 2011 9:47 pm ]
Post subject: 

Yep, 5/8", unless you like doing emergency loop da loop in the wet on a greasy road at speed... :lol:
Trust me it ain't funny...

Author:  willy [ Wed Sep 21, 2011 10:15 pm ]
Post subject: 

Nope, only handbrake initiated. :lol:

Author:  poeee [ Thu Sep 22, 2011 12:35 pm ]
Post subject: 

3/4" is the size of choice for a hydraulic handbrake. A land rover s2 clutch master cylinder.

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