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Post by dave1800 on Jul 3, 2013 11:55:18 GMT
I've scoured the internet, obviously not well enough as I cannot seem to find an answer about matching remote brake servos as fitted to the 1800s. I know the models used in the UK, Girling Mk2 and Mk2b whereas Australia used PBR with which I am not familiar.
Here the option should I be lucky enough to track down my car seems to be a servo from small Japanese cars. I have seen them fitted to the Mini and Austin 1100/1300 range.
A couple of basic questions.
(1) If I fitted a smaller servo would the only issue be heavier brakes or does anything else need to be considered?
(2) UK Mk1 1800s with the Mk2 servo used a combined limiting and reducing valve whereas the Mk11 1800s used the Mk2b servo and a simpler limiting valve mounted on the inner front wing. Mk111 cars used the Mk2b servo with a reducing valve mounted under the rear of the car.
Does anyone know the reasons for the difference between the Mk1 and Mk11 systems? Are the limiting /reducing valves interchangeable?
I believe the MK111 change was due to requirements to prevent rear wheels locking under heavy braking.
I guess some of you may have gone through this hoop already and used Lockheed or other components. Grateful for advice and a quick note of your experiences.
Thanks
David
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Post by kelsham on Jul 3, 2013 14:05:57 GMT
Some years back my servo failed, I fitted a repair kit and it failed within a couple of months. As no one seemed to be able to supply a new servo I ordered a Lockheed replacement which required some fettling of the mounting brackets to make it fit.
It is still in use.
I seem to recall reading that there is a company now rebuilding the earlier servos, sorry don't have a name.
regards Kels.
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Post by tommydp on Jul 3, 2013 14:36:30 GMT
All mk 2 1800s sold in Norway, and I believe Sweden too, had The Girling Supervac servo fitted. The mk1 I used to have, also had this. This has the master cylinder mounted on it.
I may have been unlucky with the two earlier I've had with the Powerstop servos but I prefer the Supervac by far. I've never had an issue with the Supervac units, other than some rattling from the one way valve. On the other hand I had numerous issues with the Powerstops.. Including brake fluid sucked into the engine.
So, Supervac it is for me. I believe the same units were used on early UK Maxis and Marinas. I believe you can modify the firewall to take the Supervac, but you may need a reinforcing panel behind it.
Tommy:-)
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Post by Penguin45 on Jul 3, 2013 17:37:46 GMT
NORTON SERVOS is the UK specialist repairer. Excellent reputation, expensive. Assistance ratio is 3:1, so from a purely practical point of view any single circuit (remote) servo with the right (ish) ratio would do the trick, bearing mind that an Eastern unit will probably have metric fittings. Chris.
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Post by dave1800 on Jul 4, 2013 0:50:03 GMT
Hi Tommy Am I right to think that the Supervac direct acting servo was only fitted to left hand drive cars because of space restrictions and the tandem master cylinder not on UK cars? regards David All mk 2 1800s sold in Norway, and I believe Sweden too, had The Girling Supervac servo fitted. The mk1 I used to have, also had this. This has the master cylinder mounted on it. I may have been unlucky with the two earlier I've had with the Powerstop servos but I prefer the Supervac by far. I've never had an issue with the Supervac units, other than some rattling from the one way valve. On the other hand I had numerous issues with the Powerstops.. Including brake fluid sucked into the engine. So, Supervac it is for me. I believe the same units were used on early UK Maxis and Marinas. I believe you can modify the firewall to take the Supervac, but you may need a reinforcing panel behind it. Tommy:-) |
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Post by dave1800 on Jul 4, 2013 1:00:32 GMT
Thanks Chris There are a few Lockheed (copies?) on EBAY at good prices, but I am reluctant to go down that line for critical brake components. I would much prefer to source a genuine Toyota, Nissan or Honda servo here if possible as it is unlikely I will have a Girling Mk2b or similar for exchange, but there's always hope. People here never seem to throw anything away but actually finding it makes your recent garage clearance and tidy up seem like a gentle stroll! Regards David but Ils NORTON SERVOS is the UK specialist repairer. Excellent reputation, expensive. Assistance ratio is 3:1, so from a purely practical point of view any single circuit (remote) servo with the right (ish) ratio would do the trick, bearing mind that an Eastern unit will probably have metric fittings. Chris. |
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Post by threelitre on Jul 4, 2013 7:49:22 GMT
The direct acting servo was also fitted to single circuit cars, but space limitations may have been the main reason for using two different setups. The problem here is, that no repair kits have been available ever, unlike the external units. And they are not as easy to interchange: Maxi, 3litre, 1800 all use fairly different units.
Regards,
Alexander
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Post by tommydp on Jul 4, 2013 7:59:07 GMT
Hi Tommy Am I right to think that the Supervac direct acting servo was only fitted to left hand drive cars because of space restrictions and the tandem master cylinder not on UK cars? regards David You're right, Dave! I had a look at it now. Because of the wiper motor and wiring connector/ fuse panel it looks as if a direct acting servo, or rather the clutch cylinder as a result of it, would not have fitted a RHD car. LHD cars with the Supervac have the expansion tank were RHD cars have the clutch and brake master cylinders btw. So, it looks to me like LHD cars can have both types of servos, while RHD ones have not got room for a direct acting one. The 1800s sold here only had a single circuit. Dual circuits were required from 1973, by which time the crab was no longer imported. Regards, Tommy |
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