same caliper for 2.0 and 2.8 fitted with 292mm discs..why another master..
Yeah idk. Any ideas what else could be going on? Could it be a booster issue? I checked all of the vacuum line being the manifold and all look good no leaks. I've done hundreds of brake jobs on other cars, installed BBKs with new lines and after bleeding they would all be good. This is the first time I've come across this condition and of course with the Saab.if it was master then regardless of whether engine is running or not,the pedal would fall to the floor..Because the fluid would still pass the bad seals..
That may be normal- does it sink at higher RPM as well? The below is from WIS:No leaks anywhere.
But when the car is off the pedal is stiff one I start the car is get soft and goes to the floor.
The braking force is weak all around when driving, near unsafe.That may be normal- does it sink at higher RPM as well? The below is from WIS:
In a situation with an idling engine and a stationary car, the brake pedal may feel "soft" and sink somewhat lower than normal when applied. This is completely normal and will not affect braking force in a negative manner.
No leaks anywhere, fluid level stays the same. When doing all 4 corners brake job all pistons compressed with a normal amount of force and all slide pins free. Using pressure bleeder I ran 1 Liter total through the system equally at each corner to make sure no air was in the lines, then bleeding by pedal pump I cracked each corner 4-5 times just to be sure.If the pedal goes all the way to the floor, there is either a leak somewhere, or a bad master cylinder. You would have to press a LOT harder for the same brake pressure with no assist than when it cuts in. But in any case, if the pedal goes to the floor, the above two choices are about it.
Well, there is another possibility. There is a stiff caliper that makes an outsized stroke when high pressure is applied, but won't budge when you are pressing without boost. That seems somewhat unlikely to me.
Anyway, either there's a lot of brake fluid going easily down the brake lines, so pedal goes to the floor, or the fluid is bypassing the seals so the pedal can go down to the floor. I fail to think of an alternative explanation.
Well I replaced the cap this morning and unfortunately it did not help. I drove it into work and It felt like a caliper was dragging somewhere and sure enough my right rear rotor was glowing red. (I only live 3.miles form my work). So I have to take that apart tonight to see why that is happening, I'm thinking maybe my ebrake cable is sticking. When I replaced pads and rotors a month ago the piston compressed/rotated smoothly and the slide pins were free, also relubed them. Man these f-ing brakes on this car are the only issue. I just bought it used 2 months ago and it sat for a year before I bought it. Outside of replacing coil packs and a few small things I have had no major issues besides the brakes.I had the same problem you're describing with my '09 9-3 SportCombi Aero XWD. Plagued me for months. After bleeding multiple times with different methods, I thought my problem was the master cylinder and I pulled it and tested it on the bench and it was fine. Even had the dealer connect a vacuum bleeder to the reservoir cylinder, which confirmed there was no air in the line. Problem persisted. I noticed the bladder in my brake reservoir cap was deformed so I ordered a new cap and replaced it and the brake pedal has been firm ever since (1 year ago). Check the cap for cracks. I can't explain it and several folks more knowledgeable than me have said there's no way the cap was the problem but... Order a new cap and try it. May not fix your problem but bc of the heat produced by the turbo, these caps crack easily and it's good to have a spare.
I'll see what it looks like when I take it apart Brand new pads and rotor, will most likely replace. I had to do that to the left rear caliper, I peeled the boot back and spray pb blaster in there. Will most likely replace both back caliper.Holy chit!! Shes glowin! Maybe the piston is sticking inside the caliper. Poke a tiny hole in the boot & spray penetrant in there with the straw
Id probly replace the pads& rotor after that.