Hello everyone- I really enjoy your site, this is my first post. I recently purchased a '58 BN4 100/6 with drum brakes. The brake pedal hits the floor, and the brakes still aren't fully on.
The first thing I tried after reading all of your similar posts is replacing the master cylinder, bench bled, then bled lines with a Motive pressure bleeder.
Then I noticed a small leak in a front wheel cylinder, so I replaced all 4 front wheel cylinders and brake pads, then bled the system again.
The brake lines and rubber lines look recently new, with no leaks. The rear cylinders and pads are new, and don't leak.
All 4 wheels have been adjusted until the drum can just turn without hitting the pad.
There is almost no resistance on the pedal, and it will finally brake if I pump 3 or 4 times. Then, the next time I pump it goes back to the floor. The new master feels exactly the same as the original master.
Any help would be appreciated!!! Thank you, Neil
The first thing I tried after reading all of your similar posts is replacing the master cylinder, bench bled, then bled lines with a Motive pressure bleeder.
Then I noticed a small leak in a front wheel cylinder, so I replaced all 4 front wheel cylinders and brake pads, then bled the system again.
The brake lines and rubber lines look recently new, with no leaks. The rear cylinders and pads are new, and don't leak.
All 4 wheels have been adjusted until the drum can just turn without hitting the pad.
There is almost no resistance on the pedal, and it will finally brake if I pump 3 or 4 times. Then, the next time I pump it goes back to the floor. The new master feels exactly the same as the original master.
Any help would be appreciated!!! Thank you, Neil