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| Jimmys old Saab | Posted - 17 Apr 2021 : 15:38:06
I also got around to refitting the calipers to the 96, getting the flexi hoses secured to the pesky brackets on the inner wings is a massive ballache :)
So I started, with some assistance on bleeding, front nearside and rear offside produced some results, with fluid leaking out, however the pedal remained very floppy and after multiple tries nothing could be made to come out of the front offside and rear nearside bleed nipples.
I'm guessing that one part of the dual circuit is not working due to damaged seals in the master cylinder?
I also realise that some systems are an absolute pig to get the air out of, is the V4 an especially difficult one?
Saab 96 1971
Datsun 120y coupe 1975
Saab 9000 CSE turbo 1993
VW T5 LWB 2012
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| 15 L A T E S T R E P L I E S (Newest First) |
| Jimmys old Saab | Posted - 25 May 2021 : 18:07:09
A bit more progress made, I rigged up a vetinary siringe with a suitable bit of tubing and pumped fluid into the bleed nipples, worked especially well on the offside front caliper, air was expelled into the reservoir and then the level started to rise. I'd say the brakes feel and react normally now, certainly the calipers so that's a result.
Saab 96 1971
Datsun 120y coupe 1975
Saab 9000 CSE turbo 1993
VW T5 LWB 2012
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| 967220 | Posted - 20 May 2021 : 13:21:15
I have just had the master cylinder (large cap type) refurbished and relined by Pastparts of Bury St Edmunds, after having dismantled three older master cylinders and having bought the new seal kit from John.
I have done a drawing covering the repair and will send you copy if it is any use.
I assume that the flexible hoses are not blocked and the bleed screws are not blocked.
As you are still not getting any fluid out of the front left and rear right the problems still seems to be in the master cylinder.
There is a possibility that the small supply holes from the plastic reservoir to the the master cylinder have become blocked thus preventing any fluid entering the master cylinder block. When I dismantled the old ones these holes were blocked. They are very small and need to be cleaned when you dismantle and fit new seals.
Peter Tyler |
| green96v4 | Posted - 20 May 2021 : 12:46:02
I had a devil of a time getting air out when I put the new repair kit in - if I recall correctly I ended up with it on the bench and pumping a bunch of fluid into it by hand just to get the air out |
| Jimmys old Saab | Posted - 19 May 2021 : 22:18:27
Well I got one of John's kits and apart from a pair of thin washers it all matched up nicely to the large cap Lockheed master cylinder.
Taking that cylinder apart wasn't quite as bad as purported to be, neither my circlip pliers nor my friends collection of high end kit would do the job but in the end I managed with a pair of small, slotted, Wiha screwdrivers.
Having put it all back together....not much joy. I have bled all four corners using a good blake bleeding kit and have sunk about 500ml of fluid into the system but the front offside and rear nearside brakes will still not bleed. What is going on? Maybe I'm just under estimating the volume of fluid the system contains and just need to continue but I have been around each corner a half dozen times!
Saab 96 1971
Datsun 120y coupe 1975
Saab 9000 CSE turbo 1993
VW T5 LWB 2012
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| EdinburghJoe | Posted - 05 May 2021 : 17:34:50
I had a problem with one of John’s BMC seal kits (small cap type)- there’s one seal which is deeper than the others and this part was missing. In the end I got a kit from Speedy Spares in Brighton, which totally matched what was on the car. Every other kit I’ve got from John Saab was fine though, so I think this might have been a one off. |
| green96v4 | Posted - 02 May 2021 : 12:49:15
John Saab has the repair kits, sells them on eBay - he does both large and small cap reservoir kits (not sure which one your is as it's in that change over window, mine is a 71 and had the large cap, but I changed to the later as I was told the large cap BMC is garbage)
https://www.ebay.co.uk/usr/john-saab?_trksid=p2047675.l2559 |
| Jimmys old Saab | Posted - 01 May 2021 : 21:44:23
Had a very thorough attempt to get the brakes working again today, using a decent brake bleeding kit. Still problems though.
The nearside front and offside rear bled fine but the other two corners produce no brake fluid. The level of fluid drops only in the rear portion of the fluid reservoir.
I guess this means that there is a problem with the master cylinder? There is no external leak but maybe fluid is not getting to one of the two circuits because of a damaged internal seal. Can someone point me in the direction of the correct kit? My car is a 1971/72.
Saab 96 1971
Datsun 120y coupe 1975
Saab 9000 CSE turbo 1993
VW T5 LWB 2012
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| christophe | Posted - 21 Apr 2021 : 21:28:30
I came to the conclusion that some brake fluid had leaked into the booster because my car got a strange (acid) smell at the exhaust. I took quite a lot out of it by using a long rubber hose and a vacuum pump through the vacuum port. You can also stuff a length of cloth by the same port and let it soak for a while. I did this this very afternoon as I wanted to check my system after doing the front brakes. Unfortunately, brake fluid is back, so I have a master cylinder repair kit in my future! Nice evening to all. |
| SAAB96L | Posted - 21 Apr 2021 : 17:36:49
Hello Joe,
A classic sign of brake fluid in some servos will be the burning of brake fluid seen clearly as excessive exhaust smoke - quite spectacular in some cases !! The vacuum hose pulls the fluid from the servo into the inlet manifold, which more often than not is due to a defective diaphragm - although I'm not certain as to the internal set-up on the 96 servo. But generically, that is the case.
Regards.
Richard. |
| melle | Posted - 21 Apr 2021 : 17:15:42
quote:
Originally posted by EdinburghJoe
If you've been using the peddle to bleed the system then the brake pedal will be moving through its full travel - ie much further than usual. This can mean it scrapes up crud and corrosion that has remained undisturbed during normal usage, which can knacker the seals (I've never done this, but I have been warned!).
I've never experienced this with brakes, but I have with clutches (both V4 and 900). For the last few years I've also been using Eezibleeds, never had a problem again.
www.saabv4.com |
| EdinburghJoe | Posted - 21 Apr 2021 : 14:51:36
To get back to Jimmy's post: I've always used an Easibleed and it works well, but you need to keep the pressure low(ish) - maybe 10-15 PSI to avoid possible damage to the master cylinder seals.
If you've been using the peddle to bleed the system then the brake pedal will be moving through its full travel - ie much further than usual. This can mean it scrapes up crud and corrosion that has remained undisturbed during normal usage, which can knacker the seals (I've never done this, but I have been warned!). Again, the easibleed avoids this possibility.
I don't think the Saab is particularly difficult to bleed. I had problems on our Golf with flexible pipes bent in an 'n' - shape - the air gathers at the top, and the fluid flow from the Easibleed wasn't enough to flush it through. In the end I removed the caliper and held it vertically above, but I don't think this is an issue on the Saab.
Good luck! |
| EdinburghJoe | Posted - 21 Apr 2021 : 14:41:51
Interesting point about brake fluid in the servo: my master cylinder leaked quite a bit of fluid (before I had it relined) and I think it may have got into the servo, but I could see no way to check: the aperture on mine where the master cylinder fits into it had an inverted cap on it with a very narrow hole, just wide enough for the operating rod.
I know from speaking to Andy Deans that they aren't all like that: he told me his servo basically had an open hole that was plugged by the master cylinder.
So on the plus side it would have been harder for fluid to get into my servo, but I can't see how to get it out. Or indeed even be sure that there is any in there.
So far my approach has been to just leave it alone! |
| christophe | Posted - 21 Apr 2021 : 10:32:35
Don't worry about this. My English is far from being perfect and I can make some "bizarre" sentences from time to time. On the bright side of things, my 96 should be roadworthy again today and the weather forecasts are very good. Unfortunately, we still got the 10 km radius limit. So, I will have to be imaginative. Nice day to all. |
| melle | Posted - 21 Apr 2021 : 08:44:59
Oops, sorry for misreading!
www.saabv4.com |
| christophe | Posted - 21 Apr 2021 : 08:35:51
Melle, I am sorry if I exprssed myself incorrectly. Of course, there must be no brake fluid in the booster. I mentioned this because I found plenty of it in mine. It seems to me that few people bother with this when changing a leaking master cylinder. |
