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PostPosted: Sat Sep 09, 2017 9:39 pm 
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Joined: Mon Nov 16, 2015 9:45 pm
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Hi all,

Doing a full set of pads and discs on the car and I've got the rear discs off. One side needed 'encouragement' to free the disc but it came off and the remaining parts are all ok. What I wondered was:

Do I bother swapping the handbreak shoes? Stripping them according to the good word that is Haynes, suggests I should strip the hub assembly off (stopped before that stage today due to time). There is a pretty reasonable amount of meat left on the old shoes. Any thoughts?

Anyone removed the shoes with the hub in situ? Any tips for getting it done? I would accept 'don't bother, remove the hub' in this category!!

While I'm thinking on it, both inner rear pads seemed to have jammed in the calliper and had to be prized out. Anyone had to deal with siezed piston on the inner side (it looked like it was a piston on both sides. It I could be wrong there)?

Thanks guys, all the best.
Ally


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PostPosted: Sat Sep 09, 2017 10:25 pm 
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Joined: Mon Sep 10, 2012 10:50 am
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Location: Bury St Edmunds, Suffolk
Car Model: 9-5 Aero HOT Edition 2008
I changed the rear discs and pads on my car today and the handbrake shoes had plenty of meat on them so i didn't touch them. In relation to the jammed pads, are you talking about the actual brake pads on the piston side.

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PostPosted: Sun Sep 10, 2017 7:55 am 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
The more I think on it, the more I think I'll do the same and leave the old shoes on, like you suggest.

As for the pads, I assumed at first glance that there was a piston pushing on each brake pad. Even having just looked again, I'm unsure if that's true. So as a daft question, how many pistons per side and on which pad does a piston push.

The ones that were stuck in there were the inner pads on both sides. Both outer pads had worn away all the brak pad lining, while both inner pads had about 1cm of wear left.


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PostPosted: Sun Sep 10, 2017 8:12 am 
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Location: Queenborough, Kent
Car Model: 9k, 9-5 Aero & a Jaaag
I can't be 100% sure, but generally Saabs of that era use a "floating" rear calliper with a single piston. So if it's wearing on one side only, the would indicate that it's not able to slide. Check it's able to move, make sure you use red rubber grease (or silicone spray) on the rubbers that the calliper pin fits into - copper grease will cause the rubber to swell, impeding movement of the pins.

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PostPosted: Sun Sep 10, 2017 8:49 am 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Thanks for the replies. That all makes sense to me based on what I can see having stripped it down. I'll get some grease get it freed off and then it is just a rebuild. Thanks again all the best.

Ally


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PostPosted: Sun Sep 10, 2017 12:52 pm 
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Location: South Wales
Car Model: 900 SE Stage 3
These will be twin piston fixed calipers. Two pistons in each, one either side of the disc. You can buy new pins and spring clips if yours are heavily corroded. Pistons can and do get stuck with these causing odd wear patterns.
Image

No harm in leaving the handbrake shoes if the material is still thick and well attached.

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PostPosted: Thu Sep 14, 2017 5:52 pm 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
I should have known better than to say it's just a rebuild.

I have both rear calipers of now as both outer pistons seem reluctant to budge. The inner pistons push right back into the housing but the outer ones won't (with similar force). Anyone know if the outers do need to be pushed in fully flush?

Also, anyone got any tips for getting the pistons out the caliper in order to renew the internal seals and dust covers? One dust cover per caliper is split.


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PostPosted: Thu Sep 14, 2017 7:23 pm 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
It's possible to pop them out with compressed air.

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PostPosted: Thu Sep 14, 2017 8:29 pm 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Are both pistons pressurised by the brake fluid when fully installed, and thus both would come out with compressed air? I looked at the calipers and thought that if there is an internal passage cast in the metal as a feed line, then it must be pretty narrow due to the size of the available path.


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PostPosted: Fri Sep 15, 2017 4:53 am 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
Yes they should both come out.

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2000 9-3 2.3 viggen convertible.
NoobTune Stage 3, with Wossners.
http://miikka.org/saabcode/


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PostPosted: Fri Sep 15, 2017 6:05 am 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Thank you sir


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PostPosted: Sat Sep 23, 2017 5:08 pm 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Right - how in a the name of **** do you fit the piston dust gaitors back on? My finger tips are agony and I've split one good and proper trying to refit it!!


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PostPosted: Sat Sep 23, 2017 5:45 pm 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
It’s been a good few years since I’ve messed with brake callipers. Yes they are tricky. I can’t remember how I did it. :( try searching on YouTube.

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http://miikka.org/saabcode/


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PostPosted: Sat Sep 23, 2017 6:54 pm 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Could be that they are old and have hardened up a bit. Perhaps a new set.


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PostPosted: Sat Sep 23, 2017 7:30 pm 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
Probably sometimes putting them in warm water for 10 minutes make them pliable.

https://youtu.be/rf-ONbg9-os

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2000 9-3 2.3 viggen convertible.
NoobTune Stage 3, with Wossners.
http://miikka.org/saabcode/


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PostPosted: Sat Sep 23, 2017 8:54 pm 
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
That's a top idea.

Ever heard of anyone building them up without gaitors?


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PostPosted: Sat Sep 23, 2017 8:59 pm 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
No I haven’t. They there to keep all the road poo out. Dust covers.

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2000 9-3 2.3 viggen convertible.
NoobTune Stage 3, with Wossners.
http://miikka.org/saabcode/


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PostPosted: Sat Sep 23, 2017 9:13 pm 
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Car Model: 9k, 9-5 Aero & a Jaaag
not just dust, but moisture too - which makes the pistons rust and then seize ... :wall:

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'98 9k 2.3T CSE, stage 3
'04 9-5 Aero manual, stage 3
'08 Jaguar XFR (quick enough as-is)


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PostPosted: Sat Sep 23, 2017 9:21 pm 
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Location: Ingleby barwick, cleveland
Car Model: 2000 9-3 viggen convertible.
And that. ^^^

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2000 9-3 2.3 viggen convertible.
NoobTune Stage 3, with Wossners.
http://miikka.org/saabcode/


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PostPosted: Sun Sep 24, 2017 7:11 am 
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Joined: Mon Nov 16, 2015 9:45 pm
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Car Model: 9-3 (2001) 2.0 SE Turbo Petrol
Fair point. I stumbled on a thread asking the gaitor / no gaitor question. Best replaces then!!


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