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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...) ![]() |
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? ![]() |
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. ![]() |
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... ![]() Trust me it ain't funny... |
Author: | willy [ Wed Sep 21, 2011 10:15 pm ] |
Post subject: | |
Nope, only handbrake initiated. ![]() |
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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