| Author |  Topic  | |
Dirtbiker
V4 Guru
United Kingdom
1061 Posts |  Posted - 17 Mar 2018 : 19:28:20  
| Hi,
Anyone know where I can find an exploded diagram of the later type (small cap) Lockheed brake master cylinder? Page 521-7 of the SAAB workshop manual shows a cut away drawing but an exploded diagram would be useful.
Cheers |
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green96v4
V4 Mad
Canada
738 Posts | Posted - 17 Mar 2018 : 20:23:44
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greg124
V4 Fan
United Kingdom
173 Posts | Posted - 17 Mar 2018 : 22:24:43
| | That's good timing guys, as rebuilding the master cylinder is getting close to the top of my to do list. | |
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Dirtbiker
V4 Guru
United Kingdom
1061 Posts | Posted - 19 Mar 2018 : 20:51:11
| Hi Matt,
Thanks for the diagram, very helpful. Also, love your car, I think it must be the same spec as my 96 only much more lovingly restored!
Right then, never done one of these master cylinders before and what I started with is as follows:
An utterly butterly tub with a load of bits in submerged in brake fluid (which is good!)
A freshly painted mc body (also good!)
A four part seal kit
I have established that some of the bits were for the clutch mc which is now working nicely.
I think I have figured out where the rest goes on the brake mc but I would welcome input on if I am correct before bolting it in and bleeding the brakes.
So, pictures:
The picture above shows how I think it all goes together. I am a bit concerned about which way around the seals go. I think the following (referencing the part numbers in Matt's diagram):
7. lip facing left
10. lip facing right
7. (second one) lip facing left
13. lip facing left
The picture above shows the same from another angle.
The one above has the mc body in so you can check I am looking at the right diagram.
And this one shows the Utterly Butterly tub with it's remaining contents. I'm worried about that "peg" at the top of the picture. Perhaps (and hopefully!) from elsewhere?
Help much appreciated!
Thanks in advance,
Gareth
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Edited by - Dirtbiker on 19 Mar 2018 20:55:25 | |
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digger
Starting Member
46 Posts | Posted - 20 Mar 2018 : 20:34:05
| Hi Gareth
I think I'm right in saying the pin in the utterly butterly tub is quite important, as it is the secondary piston retaining pin. On Matt's exploded diagram it is number 15. If you look at the two fluid feeds on top of the master cylinder, one has an extra hole, this is where the pin will be inserted using a pair of snipe nosed pliers after you have inserted the secondary piston and spring, and compressed the spring. The pin is there to limit the secondary piston's travel. I hope this is of some help | |
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green96v4
V4 Mad
Canada
738 Posts | Posted - 21 Mar 2018 : 10:49:00
| Digger's right, I've just checked the parts list on the following page and 15 is listed as "Stop Pin" 7372642
Glad you like my car, although mine has the earlier "large cap reservoir", much to my frustration as it's leaking and I've tried a new piston, new seals and I've now sent it away to be resleeved | |
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Dirtbiker
V4 Guru
United Kingdom
1061 Posts | Posted - 21 Mar 2018 : 16:26:13
| Digger - thanks, extremely useful! Unfortunately I have been struck down with man flu so no evening garage time this week but I shall report back as soon as I get back out there!
Matt - This MC is for my 95. My 96 has the "large cap reservoir" too. Here's a link to my car so you can see how similar (in spec, not condition!) they are
http://www.saab-v4.co.uk/speedball/topic.asp?topic_id=2683
Cheers
Gareth | |
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john-saab
Administrator
United Kingdom
2679 Posts | Posted - 22 Mar 2018 : 19:05:04
| Sorry for the late reply. The pin is vital AND fitting it correctly is also vital. With the master body in a vice push the pistons as far in as they will go (I use a 1/4 socket bar) it's only then that you insert the pin (look into the hole that you will be pushing the resvoire into..you will see the offset hole) Then release the pressure off the pistons. If you don't do this the first time you use the master you will destroy the seal and the brakes wont work.
The thin washer in your tub should also be in your master...item No 8 in the top picture..you should have 2 of them..these are anti return "valves"
'73 96 (Vernon),'74 95 (Veronica)plus 4 other 95's and 2 96's | |
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Dirtbiker
V4 Guru
United Kingdom
1061 Posts | Posted - 26 Mar 2018 : 21:08:19
| Hi John,
Don't worry about the slow reply - man flu continued to halt progress last week! Catching up with life this week but hopefully back in the garage over Easter. Thanks for the tip with the socket bar, sounds like a plan!
The tub had four washers and three circlips in it. One washer and one circlip found their way into the clutch MC and two washers into this already so I think one left over... This excess of components was what led me to believe the pin was not needed, I thought 15 was pointing at the seal between the reservoir and just didn't spot the pin.
Cheers | |
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pchristy
V4 Guru
United Kingdom
1790 Posts | Posted - 26 Mar 2018 : 22:54:43
| And the reason John knows this is because a few years ago, I had a master cylinder sleeved and professionally rebuilt, and they managed to get the pin in the wrong side of the piston. As I discovered when I tried to bleed the rear brake circuit!
Fortunately, John had spare seals in stock, but did I curse at having to do the job all over again.....! 
--
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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john-saab
Administrator
United Kingdom
2679 Posts | Posted - 30 Mar 2018 : 07:25:03
| quote:
Originally posted by pchristy
And the reason John knows this is because a few years ago, I had a master cylinder sleeved and professionally rebuilt, and they managed to get the pin in the wrong side of the piston. As I discovered when I tried to bleed the rear brake circuit!
Fortunately, John had spare seals in stock, but did I curse at having to do the job all over again.....!
--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
And since then they have done the same to at least one more I know of plus lost a master (as they did with the first one I sent them)
'73 96 (Vernon),'74 95 (Veronica)plus 4 other 95's and 2 96's | |
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pchristy
V4 Guru
United Kingdom
1790 Posts | Posted - 31 Mar 2018 : 17:30:43
| On the plus side, since I reassembled it correctly, its been fine!
--
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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| | Topic | |
Brake Master Cylinder Diagram
