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My son’s civic (165K) brake pedal sinks way down to the floor to engage the brakes. Shoes and pads a relatively new. Performed a brake bleed (2 person method) the pedal improved and operated like it should. A few weeks later its back to the way it was. Performed a visual inspection of all lines and wheel cylinders no visible leak. Is this a master cylinder issue. not to expensive and relatively easy to replace ,I think. Can anyone please point me in the right direction.
Thank you
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Sounds like a classic master cylinder problem. Very common on that vehicle.
More info on solving brake problems at the link College man posted for you.
Please keep us updated on your progress.
I imagine it is probably solved by now but my first thought –
When doing brakes, make sure the caliper guide pins move freely. For some reason they tend to seize in their bores and make brake feel pretty bad.
Mine is a toyota but when i got it, there was that spongy, almost to the floor feel. During pad replacement, I came across a seized pin. Spent an hour trying to work it out, clean it, clean bore, regrease, and then finish brake job. Brakes work excellent now. Just barely tap on the brake pedal and the car screeches to a halt. 😀May not likely be the problem you are having but these pins are often overlooked.
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