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A friend of mine has his fathers 1969 out for much needed driving and maintenance, this car dose not get driven much. The problem is the brake pedal starts out fine but after a some driving the pedal goes to the floor. The master cylinder is full, but the front half is very cloudy, and when the pedal is pressed you can see gray fluid flowing back in to the master cylinder. His father says he has had the master cylinder replaced and the brakes bled recently. There are no leaks that can be seen.
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Re: 1969 Brakes
Sounds to me like the fluid needs to be changed again (shouldn't be any cloudy residue in a system with brake fluid freshly changed) and blead again. Sometimes we 'try' to get all the air out and miss the mark....
Also, there could be an issue of the seals at the caliper pistons. If there's not a good fit there or too much run-out in the rotors, you could be pumping air into the brake lines from the caliper(s).... -
Re: 1969 Brakes
The first issue is that it isn't driven much. These cars were not designed to be stored in garages, and the brake system is the first part that rebels.
Bleed the brakes, and since the fluid is cloudy, like Jack said, flush the old fluid and install new. Then prepare to bleed before each outing if it sits long periods.
If it gets worse, as you drive, there is too much run out in the rotors and they are pumping air into the system. Were the rotors removed from the car? Were the rotors turned? If yes, then this is the problem. You now have to locate the alignment that the rotors have the least run out, and if still excessive, you will have to shim them to be true.
If the pedal goes to the floor and stays, it won't pump up to come home, then the master cylinder is bad.Comment
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