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Sinking brake pedal

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95 Outback, 158k. Stops great, no fluid leaking anywhere. If I stand on the brake pedal at startup it will be fine then about 3 seconds later it sink down lower. I did get an ABS light come on earlier where I had an idiot abruptly stop in front of me. The light went off when I restarted the car.

 

Brakes needing bled?

  • Author

I'm sorry to offend. But you're English confuses the crap out of me.

The seals in the master cylinder are leaking. you need to replace it.

Master cylinder is bad. Pressure is bypassing the seals so your pedal sinks. Fix it asap.

Master cylinder is bad. Pressure is bypassing the seals so your pedal sinks. Fix it asap.

 

X2 on MC seals going bad. I would replace the Master Cylinder, if it were me.

  • Author

Just to ask a few last questions for my sake.

 

Doesn't sound like air in the lines or ABS unit?

How do I go about changing this thing?

  • Author

Also did the brake booster check. About the 4th pump the brake pedal was very firm and sank a little lower once the car was started. Least that ain't broke.

Just to ask a few last questions for my sake.

 

Doesn't sound like air in the lines or ABS unit?

How do I go about changing this thing?

 

It is very simple. Look at a haynes manual, but it is very straight forward. Use line wrenches for the brake lines. No need to mess with the ABS and it is all startight forward to bleed.

before you get a new master cylinder, double check your ABS codes, my 94, lego will sometimes sink a bit when i'm at a stop, but it will throw a code and the pedal feels as if the ABS is kicking in.

 

A quick reset of the ignition and its good to go again.

  • Author

No more ABS codes since the other night. I am assuming they are linked. The light came on right after I had to get on the brakes really hard but went off when I restarted the car.

  • Author

New master cylinder installed this evening. No more Titanic brake pedal.

 

Not a bad repair at all.

New master cylinder installed this evening. No more Titanic brake pedal.

 

Not a bad repair at all.

 

Congrats on the MC install. It is always satisfying when a do it yourself project is successful. Drive your Subie another 100K miles!

  • Author

Oh, I plan to.

 

Now I just need to find that STi to park next to it.

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