| Author |  Topic  | |
christophe
V4 Fanatic
France
227 Posts |  Posted - 30 Nov 2021 : 09:55:07  
| Hello there,
I'm afraid I can't understand how my master cylinder (1979 model) really works, so, I am looking for some information.
I had to refurbish it because it was leaking into the servo. I noticed that the discharge hole at the bottom end was clogged. This may have caused the leak, but I don't know for sure.
I am puzzled by the radial hole in the nylon washer. Is it there to guide some brake fluid onto the piston to lubricate it? In this case, is the position of the hole of the washer located behind the seal relevant or not? The shop manual gives no explanation about it.
I used a Seinsa D1123 seal kit and the fit seem to be perfect. The two outer seals might be a little bit thicker but I was able to put the circlips back. This kit also includes a kind of a donut seal which might replace the outer seals and the nylon washer.
Thanks for your thoughts and have a nice day.
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Edited by - christophe on 30 Nov 2021 15:02:03 |
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Woody
V4 Guru
United Kingdom
2764 Posts | Posted - 30 Nov 2021 : 14:06:35
| Afraid to say it is 30yrs since a did any significant work on a brake master-cylinder, and that was on a 1970 model which differs from the 1972 model which I put new in the Troll. There are I believe differences between LHD and RHD cylinders even with the internal components.
I have some old rebuild kits which I would need to look at. As I haven't actually worked on a LHD cylinder there isn't much that I comment on. Member john-saab works on these from time to time and may be able to comment using a more experienced eye. |  |
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melle
V4 Guru
United Kingdom
3833 Posts | Posted - 30 Nov 2021 : 15:03:41
| Same here, I've done quite a few, but it's been a while and I find it really difficult to picture this kind of stuff without having one in front of me.
www.saabv4.com | |
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christophe
V4 Fanatic
France
227 Posts | Posted - 30 Nov 2021 : 15:04:50
| Thanks for your replies. Yes RHD and LHD units are different. RHD ones do not have the discharge hole as far as I know.
I've added the cutaway view it it might help. |
Edited by - christophe on 30 Nov 2021 15:06:34 | |
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andydeans3
V4 Guru
United Kingdom
2016 Posts | Posted - 12 Dec 2021 : 22:28:02
| Am I correct in saying that this is the ATE Master cylinder?
Where exactly is this discharge hole that you refer to Christophe?
1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro | |
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christophe
V4 Fanatic
France
227 Posts | Posted - 13 Dec 2021 : 11:52:05
| Hi Andy,
Yes, this is the ATE master cylinder.
The discharge hole is located at the bottom of the back end, at the end of the conduit just under the nylon washer. You can see it on the right of the picture.
This MC was also used on some VWs , BMWs, even some Renault Trafics and more. I studied the shop manuals I found online but they did not explain how this setup works.
Nevertheless, none of them mentioned a particular orientation for these washers. The BMW manual instructed to fill the space between the two seals with silicone grease, though.
I finally put the two holes up. The MC is back on the car but I have not tried to bleed the system yet.
Nice day to all. |
Edited by - christophe on 21 Dec 2021 10:09:48 | |
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christophe
V4 Fanatic
France
227 Posts | Posted - 21 Dec 2021 : 10:18:29
| Just a little follow-up about this refurbishment.
I bled the MC without any fuss by using a check ball unit.
I started by the front wheels and it seemed that the system was OK after this.
Of course, I also bled the rear wheels to get all the old fluid out but I don't think this was really necessary.
No leak so far at the MC, so I think the job is done.
Nice day to all. | |
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| | Topic | |
Late model Brake Master Cylinder - LHD
