Ok...so I'm running into this really small issue.
When I dropped my subframe to replace it - I also decided to change my SS brake lines to SS lines that had an exterior clear teflon coating - which would protect the SS weaves from picking up dirt particles and causing them to work their way into the lines.
Very straight forward - I've done it before, it's not difficult at all.
At the same time, I went ahead and removed my master cylinder to bench bleed it since I hadn't done it before when I removed it. Did this correctly, I thought, and got rid of any and all air bubbles within the master cylinder.
When I got everything back together, I bled the brakes using the BavAuto pressure bleeder (and of course brand new fluid) set at 15 PSI.
I went around once, then waited a night and went around the car a second time.
I'm pretty sure there's still air in the lines even though after both times of bleeding them, I've had no air come out.
Now, when I'm more than half way on the brake pedal, ALL FOUR brakes vibrate. This isn't a warpage vibration - it's something else.
Let me make note of something else - before I took my car apart, my brakes were PERFECT! I went to a track, and slowed down from speeds up to 100mph - and they worked PERFECTLY! Not a single ounce of fade or vibration.
Now vibration is apparent at speeds as low as 40 mph when I apply more than half the brakes. This, again, is not rotor warpage, I know what that feels like. The vibration occurs from all around the car. At higher speeds, I also get a lot of brake fade - where I never got any at all before.
All calipers are rebuilt, less than 5000 miles on them, all fluid was as clean as the day I put it in when removed, and all pads and rotors are in excellent shape.
HERES what I'm thinking and I wanted to see what others thought. I'm thinking that since there's still air in the lines, the fluid had boiled when I faded, and now the air bubbles are all trapped at the caliper of each line. So, when I get on the brakes, that slight small amount of air allows the caliper piston to bounce back and forth causing a slight vibration - but only under a heavy amount of pressure from the pedal.
Does this make sense? I'll be bleeding my brakes sometime this week. They work fine around town, which is why it's not so cruicial to me. Just wanted to see if other people thought this might be the case?
When I dropped my subframe to replace it - I also decided to change my SS brake lines to SS lines that had an exterior clear teflon coating - which would protect the SS weaves from picking up dirt particles and causing them to work their way into the lines.
Very straight forward - I've done it before, it's not difficult at all.
At the same time, I went ahead and removed my master cylinder to bench bleed it since I hadn't done it before when I removed it. Did this correctly, I thought, and got rid of any and all air bubbles within the master cylinder.
When I got everything back together, I bled the brakes using the BavAuto pressure bleeder (and of course brand new fluid) set at 15 PSI.
I went around once, then waited a night and went around the car a second time.
I'm pretty sure there's still air in the lines even though after both times of bleeding them, I've had no air come out.
Now, when I'm more than half way on the brake pedal, ALL FOUR brakes vibrate. This isn't a warpage vibration - it's something else.
Let me make note of something else - before I took my car apart, my brakes were PERFECT! I went to a track, and slowed down from speeds up to 100mph - and they worked PERFECTLY! Not a single ounce of fade or vibration.
Now vibration is apparent at speeds as low as 40 mph when I apply more than half the brakes. This, again, is not rotor warpage, I know what that feels like. The vibration occurs from all around the car. At higher speeds, I also get a lot of brake fade - where I never got any at all before.
All calipers are rebuilt, less than 5000 miles on them, all fluid was as clean as the day I put it in when removed, and all pads and rotors are in excellent shape.
HERES what I'm thinking and I wanted to see what others thought. I'm thinking that since there's still air in the lines, the fluid had boiled when I faded, and now the air bubbles are all trapped at the caliper of each line. So, when I get on the brakes, that slight small amount of air allows the caliper piston to bounce back and forth causing a slight vibration - but only under a heavy amount of pressure from the pedal.
Does this make sense? I'll be bleeding my brakes sometime this week. They work fine around town, which is why it's not so cruicial to me. Just wanted to see if other people thought this might be the case?
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