DWinTX
Well-Known Member
Had a scary thing happen yesterday. My son was driving his 65 Coronet when the brakes failed. All of them, not just one end. Fortunately, he was almost stopped already at a stop sign when it happened. Pedal went to the floor and the brakes were 95% gone. They provided a little drag so he was able to limp it into a parking lot and called for a tow.
There was no fluid loss. We looked at the street and it was clean. When we got the wheels off we checked the entire system, no leakage anywhere. MC was full. But the pedal just went to the floor with minimal resistance.
This has had the Disc-O-Tech swap so manual front disks with 70's A body stuff on the front. Rear drums are stock style, but rebuilt. The MC is a Raybestos MC36406 (15/16" bore). I happened to have a spare MC (same part #), so since we couldn't find any leaks, we swapped it on. With just bench bleeding there was plenty of pedal pressure.
This brake system, including the M/C, probably has 500-600 miles on it. I pulled the piston out and the seals look fine, I see no tearing. This is supposed to be new, not reman. The bore looks good as far as I can tell. I'd think if it was scored, out of round, whatever, that the brakes wouldn't have worked from the start.
What could be wrong with it? Have you ever had an MC fail on both sides? I thought they we designed not to do that?
These brakes worked great for those 600 miles, didn't even notice they weren't power. The pedal didn't require much pressure and the stopping power was as good as a modern car.
There was no fluid loss. We looked at the street and it was clean. When we got the wheels off we checked the entire system, no leakage anywhere. MC was full. But the pedal just went to the floor with minimal resistance.
This has had the Disc-O-Tech swap so manual front disks with 70's A body stuff on the front. Rear drums are stock style, but rebuilt. The MC is a Raybestos MC36406 (15/16" bore). I happened to have a spare MC (same part #), so since we couldn't find any leaks, we swapped it on. With just bench bleeding there was plenty of pedal pressure.
This brake system, including the M/C, probably has 500-600 miles on it. I pulled the piston out and the seals look fine, I see no tearing. This is supposed to be new, not reman. The bore looks good as far as I can tell. I'd think if it was scored, out of round, whatever, that the brakes wouldn't have worked from the start.
What could be wrong with it? Have you ever had an MC fail on both sides? I thought they we designed not to do that?
These brakes worked great for those 600 miles, didn't even notice they weren't power. The pedal didn't require much pressure and the stopping power was as good as a modern car.