pewe
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| posted on 6/9/07 at 09:21 AM |
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Tin top brake question
Noticed yesterday whilst driving the tin top (SAAB 9-5) that when hot the brake pedal goes soft (long) for the first application but firms up for
subsequent braking.
It's particularly noticeable under motorway braking.
Today when relatively cold it's hardly noticeable at all.
My intial thought is air in the system (it's probably overdue for a fluid change anyway) though I would expect it to happen all the time.
Could it be pad/disc wear or servo related?
It's strange that it only happens when hot.
Any solutions/thoughts welcomed.
Cheers, Pewe 
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omega 24 v6
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| posted on 6/9/07 at 09:39 AM |
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could it be the pads retracting into the calipers during a long period of time(overnight) or a long period of vibration (motorway).
Just a thought.
If it looks wrong it probably is wrong.
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pewe
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| posted on 6/9/07 at 09:55 AM |
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Omega, thanks - like that one.
Strange that it only happens when its hot and/or been running for a bit.
That's why I was thinking servo but hadn't thought of slack in the pad area.
Pads are about up for renewal so looks like that's Sat. taken care of.
Cheers, Pewe.
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britishtrident
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| posted on 6/9/07 at 12:28 PM |
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Two main causes both already high lighted by the omega man -- pull back by the seals (especially with worn pads) pad knock back by disk run
out/bearing play.
In addition build up of light coating of dust/crud/slime on the disc cab cause a slight delay in the brakes bighting on first press, the latter can be
really noticeable on some models in wet motorway driving.
If you have ABS on the car remember to clamp the brake hose and push the excess fluid out through the nipple when pushing back the caliper pistons.
[Edited on 6/9/07 by britishtrident]
[Edited on 6/9/07 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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pewe
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| posted on 6/9/07 at 03:07 PM |
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Thanks guys, never ceases to amaze me how user friendly and rapid this site is. Cheers, Pewe
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