Re: weak brakes - Saab 9-5 Bulletin Board - Saabnet.com
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Re: weak brakes
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Posted by Mark in Marine [Email] (#1837) [Profile/Gallery] (more from Mark in Marine) on Sat, 30 Apr 2016 19:04:06 Share Post by Email
In Reply to: weak brakes, SRS900S, Sat, 30 Apr 2016 15:23:01
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I can't comment on the Tech II (wish I had one though). The brakes are very likely a pad and rotor thing - rarely, it can be sticky calipers. Usually it is correctable by changing pads alone if the rotors are true and not corroded.

There are lots of opinions on rotors. Cast iron rotors perform mostly the same if cast and machined well - EXCEPT that the surface chemistry does matter. So heat history and the pad material last used will modify the iron, but exactly how much is one of those areas hard to pin down. Properly bedding pads with enough organic content is said to create a very hard iron carbide layer on the rotor surface. This is chemically very probable under high heat with enough organic binder or carbon in the pads. I doubt that this is the only way to get long wear and good performance.

I have had very good experience with Akebono ceramic pads on the 9-5's we have owned. But my BMW 325xi with Akebonos will soon get different pads - the Akebonos on it are great when warm, or cold and dry, but when cold and wet they seem to hold a film of water which slides over the rotors (maybe only a rotation or two), and first application at freeway speeds can give a momentary pull left or right. That car has brake cooling vents that dump air and water right onto the rotors. I have never had this happen on our 9-5s, and it didn't happen on the BMW with previous pads.

Search for more opinions on pads - many opt for Textar.

Good luck,

Mark in Marine


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