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How do I identify size of rear cylinder?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=60242		 Page 1 of 1
Author:  Mearcat [ Tue Jan 12, 2010 4:48 pm ]
Post subject:  How do I identify size of rear cylinder?
Is there any way to identify whether rear brake cylinders are 3/4", 5/8", etc. I have two new ones in a box but there are no parts numbers.
Author:  Mick [ Tue Jan 12, 2010 4:49 pm ]
Post subject: 
You're identifying the ones in the box and not on the car?

You can lift the rubber boot on either end of the cylinders and measure the diameter of the bore.
Author:  Mearcat [ Tue Jan 12, 2010 4:53 pm ]
Post subject: 
Mick wrote:
You're identifying the ones in the box and not on the car?

Yup - in the box. I guess if they were intsalled on the car, I'd have to remove the brake pads first to do measure that.
Author:  GT mowog [ Tue Jan 12, 2010 5:02 pm ]
Post subject: 
I would suggest rather than looking at what has been fitted, look at what is correct for the car. 99% of the Mini's I see have the wrong rear wheel cylinders fitted.

Drums on the front - twin leading shoe = 3/4"

Discs = 5/8"

There were a couple of sizes for the rears when drums were on the front, but the 3/4" are about all you'll get now (for drum front end) and should work OK.
Author:  850man [ Tue Jan 12, 2010 6:06 pm ]
Post subject: 
850s with single leading shoe front brakes had 5/8 cylinders on the back.
Twin leading shoe fronts had 3/4 rear
Discs had 5/8 rears, like Mr Mowog said.
Author:  GT mowog [ Tue Jan 12, 2010 6:18 pm ]
Post subject: 
850man wrote:
850s with single leading shoe front brakes had 5/8 cylinders on the back.


I do actually know that but does anyone still run single leading shoe?
Author:  drmini in aust [ Tue Jan 12, 2010 6:20 pm ]
Post subject: 
Considering how crap those old 850 front brakes were, you could probably fit BIG ones in the back and still not lock em up. :lol:
Author:  sitnlo62 [ Tue Jan 12, 2010 9:39 pm ]
Post subject:  Re: How do I identify size of rear cylinder?
Mearcat wrote:
Is there any way to identify whether rear brake cylinders are 3/4", 5/8", etc. I have two new ones in a box but there are no parts numbers.


With the wheel cylinder in your hand, and the bleed nipple facing you and uppermost the 5/8 cylinders have the roll pin on the right hand side!!!!! :wink:
3/4 ones have it on the left hand side.
Obviosly back plates are different too but many have been redrilled.
Dave
Author:  Mearcat [ Wed Jan 13, 2010 10:13 am ]
Post subject:  Re: How do I identify size of rear cylinder?
sitnlo62 wrote:
With the wheel cylinder in your hand, and the bleed nipple facing you and uppermost the 5/8 cylinders have the roll pin on the right hand side!!!!! :wink:
3/4 ones have it on the left hand side.
Obviosly back plates are different too but many have been redrilled.
Dave


Now THAT is some useful info :D Thanks Dave!
Author:  greyghost [ Wed Jan 13, 2010 12:22 pm ]
Post subject: 
GT mowog wrote:
850man wrote:
850s with single leading shoe front brakes had 5/8 cylinders on the back.


I do actually know that but does anyone still run single leading shoe?


i do and they are quite good as long as you have them adjusted correctly, have the "good" pads and never use them too much (just so they don't over heat)
drove the car to Brisbane like this, and probably will never change them for anything else. it is an 850 afterall :D
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