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Old October 1st, 2011, 09:37 AM   #1
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Default Brakes issue.

pedal went soft, massive reduction in braking force (I have almost nothing)

No loss of fluid. pads and rotors are good.

Thinking the master cylinder shit the bed?
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Old October 1st, 2011, 09:47 AM   #2
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Thinking you're right. If you can clamp off the front and rear brake hoses and the pedel is still poopy, its the master. Also, look for some fluid loss between the master cylinder and the brake booster.
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Old October 1st, 2011, 11:47 AM   #3
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Does it have drum's in the rear? Could be a bad wheel cylinder if there are drums in the back.
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Old October 1st, 2011, 11:53 AM   #4
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What kind of vehicle?

Is it a vacuum boost system or hydro boost system?
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Old October 1st, 2011, 12:02 PM   #5
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4 wheel disc brakes, 1999 subaru impreza.

I felt/heard something click in the brake pedal, 4 or 5 pedal strokes later and no braking power, feels like a loss of fluid, do not see a burst line anywhere and master seems to be holding fluid with out any kind of leaks.
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Old October 1st, 2011, 12:07 PM   #6
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Then it does sound like a master cylinder problem. I would think if you booster was bad you would have a rock hard pedal and not soft. If you are not losing fluid then it seems maybe the plunger inside the master snapped and it isn't moving the fluid as it should.
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Old October 3rd, 2011, 08:38 AM   #7
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well, I had a lot of chores to do over the weekend, so I didn't really touch the scubaru, but there was half a brake pad laying in the driveway yesterday, and when i pulled the car in the garage and popped the front tires off there was no brake pad material on one of the pads. Still no leaks, master is still topped off fully, thinking maybe I just lost a pad and tha tmade the pedal soft and the brakes less powerful, but doesn't seem like just a missing pad could be the only culprit.
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Old October 3rd, 2011, 12:15 PM   #8
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did you clamp off all the hoses and retry? it could be swelling like a balloon when you step on it. also the loss of the pad would cause a soft pedal untill the caliper adjusted for the disdance. then it wouuld stop like crap since it is metal to metal
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Old October 3rd, 2011, 08:02 PM   #9
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Quote:
Originally Posted by JeepInABox View Post
did you clamp off all the hoses and retry? it could be swelling like a balloon when you step on it. also the loss of the pad would cause a soft pedal untill the caliper adjusted for the disdance. then it wouuld stop like crap since it is metal to metal
I haven't done any trouble shooting at all except to pull the front tires off and the one caliper.

I only tried to use the brakes about 3 times after the initial loss of pedal, then I was home, and parked it.

I'll probably get to it in a few days.
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Old October 5th, 2011, 09:44 PM   #10
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put new pads on, car is good to go.
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