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 Rear brake cylinders
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GeoffC
V4 Mad

United Kingdom
507 Posts

Posted - 03 Mar 2013 :  16:22:51 Show Profile Reply with Quote
Sonett failed it's MOT last week shock horror! Unheard of for me but it had a leaking back cyl so the rh rear brake shoes were soaked, so not good for braking efficiency!

Anyway a trip to GSF spares got me some brand new in stock (much to my amazement) rear brake cylinders labeled for 1970 Mini and Saab 96! However on getting the old ones off I find the new ones are the bigger dia ones used on the Austin 1100s and 1300s of the time which also have the dowell on the other side of the pipe fitting. Bloody annoying but I tried the bigger cylinders with my first 96 back in the 70's and the car kept swapping ends- quickly reverted to the std set up! No way am I doing that again so now on the hunt for the right diameter ones! Just wondered if anybody else had had similar problems in getting them from normal rather than spe*****t suppliers?

pchristy
V4 Guru

United Kingdom
1790 Posts

Posted - 03 Mar 2013 :  16:43:16 Show Profile Reply with Quote
The ones I got for my 96 had the pins the wrong way round - think I got them from "2-stroke to Turbo", but I could be mistaken. Not had any braking issues with that one since fitting them. I recently got another pair for the 95 from Malbrads. These had the pins in the right place! Only fitted one so far (one piston had seized in the old one), but again, no issues so far.



--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
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GeoffC
V4 Mad

United Kingdom
507 Posts

Posted - 03 Mar 2013 :  17:01:21 Show Profile Reply with Quote
Thanks Pete looks like malbrads then.
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 03 Mar 2013 :  18:20:20 Show Profile Reply with Quote
I always buy the cheapest ones I can find on eBay. Just ask the seller what the piston diameter is and order according to requirements. Pins in wrong positions are easily solved by drilling new holes.

I had an issue once with a set of cylinders bought at a 'classic car s.p.e.c.i.a.l.i.s.t' in the Netherlands. The brake power at rear was uneven with the MOT, the difference between left and right was about 50% With opening up the drums the cause became clear, on one side the cylinder was leaking. I replaced both cylinders, but the difference still was around 50% After having been to the MOT-station 7 times and replacing/ refurbishing the rest of the system step by step to be sure I found the cause of the problem, the new cylinders (that were identical from the outside and came in boxes with the same number) proved to have a different bore. Never occurred to me new cylinders could be the culprit (not so sure with rotors and distributor caps normally). By the 8th time everything was working as it should with a set of cheap eBay cylinders. The 's.p.e.c.i.a.l.i.s.t.s' wouldn't give me my money back though, because the items had been fitted...

1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V
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Woody
V4 Guru

United Kingdom
2757 Posts

Posted - 03 Mar 2013 :  18:56:18 Show Profile Reply with Quote
The standard rear cylinders are 5/8" bore and the others 3/4".
I too found as Geoff did that sharp braking with the 3/4" could cause interesting handling characteristics. This was on the black 96 which then had front/back brake bias for rallying, with a two-stroke pressure valve in the rear circuit. I changed it back to standard soon afterwards.
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