No brake pressure on front circuit after master cylinder replacement

[e70jane]

Originally Posted by andrewwynn

Nope zero chance. It's for sure the boost acting on its own. Checks all the boxes and exactly matches the symptoms.

You should be able to loosen the nuts on the master cylinder to confirm.

It looks like the o-ring seal might be fat enough to perform this test and get the brakes to work properly.


–awr–

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I bled the caliper and abs again, but I haven’t yet driven on the hwy to test if the problem was still there. I did want to point out a strange problem when bleeding the calipers. While bleeding the last caliper, the front driver, loosening the bleed screw and applying the brake pedal, no fluid came out. The pedal was stiff. I had to continuously apply pressure on the pedal to finally see some fluid come out. But even then, it was dripping rather than spraying out. I wonder if this is normal?

Andrew, when you ask me to loosen the mc from the booster to see if the brakes will release, do you mean that once the car starts acting up again, and I am pulled over onto the shoulder, keep the car on and pop open the hood to loosen the bolts?