Question about 1999 Saab 9-5

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Press brake peddle almost to the floor and it does not stop.The mechanic says it is the master cylinder. Possible or not likely?

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If the pedal has sunk further than usual or gradually sinks then usually a Master cylinder gone bad, but also can be a ruptured barke hose or line. It can also be leaking brake caliper or wheel cylinder (will show a fluid level loss in Master Cylinder)

Posted on Jun 24, 2009

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After bleeding the brakes on my 84 mustang I noticed that one of the bleeder screws was not tight and fluid spilled out on the driveway. I tightened the screw and re-bleed the brakes but, the peddle goes...


Yes and No...Replacing the master cylinder is a good idea, however, giving the vehicle that much pressure with old lines attached may blow out the old rusted lines. If you are going to replace the master cylinder, you may just want to replace the brake lines as well.

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The brake peddle goes to the floor and has no pressue to the peddle? the brakes will still stop the car?


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When i press on my brakes it feels like it's trying to build up pressure but the break peddle go's all the way to the floor theres no noise like there's a problem with the brakes but it just wont stop what...


it sounds like one of the following problems 1. a bad master cylinder (worst case scenario) 2. air in the brake lines- solution bleed the brakes (easy to do) 3. a leaking or bad wheel cylinder- solution replace the wheel cylinder (fairly cheap)

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Brake peddle will stop vehicle, but if I keep pumping, the brake peddle will go to the floor. Is this the booster or master cylinder?


this sounds like the master cylinder check the rear brakes to make sure that they are not leaking break fluid.

Good luck

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2 Answers

Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

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Put new roders, brake pads, and calipers on 2002 Olds Alero. The brake peddle is really soft and goes almost all the way to the floor....Why is this? Car has 26,000 on it..


groan......master cylinder not brakes and rotors and what not. hopefully you kept all of you old stuff because there was probably nothing wrong with it. also, make sure that you do a realy good job bleading you break = air will cause the pedal to go down to the floor. also if you change the master cylinder, that you try and bleed most of the air out before you install it into your vehicle

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Brake fade on a honda accord


here are the possibility, air in the brake line, brake line has a hole, no brake fliud, master brake cylinder bad.
need to bleed the brake lines and see if there is ahole in any of the brake lines. if not, then your master brake cylinder need to be replaced.

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1 Answer

Brakes won't hold


Check to make sure you have no leak around the tires or from the pistons in the calipers. If all that checks out ok, then I would top off the brake fluid close the top and re bleed the brakes to make sure that you have all the air out. Also make sure that the master cylinder lines and booster lines are tight and no air is getting in.

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