Re: Changing from DOT 5 To DOT3 brake fluid FED UP WITH AIR BUBBLES on my 67
Originally, the MC was bled on the car, but was removed and bench bled on the vise (and no, it was not clamped down too tight-just the opposite). It has been taken off the car as recently as yesterday and bled again on the vise again. Then did the gravity flow to the calipers and as Ed Johnson suggested, I started with the drivers side, followed by the passenger side, then the right rear inner bleeder, followed by the RR outer bleeder and on to the driver's side inner bleeder and finished up on the driver's outer bleeder. The MC was completed disconnected from the booster and allowed to hang by the fluid lines during this process to eliminate any possibility of the engagement rod holding the MC piston slightly forward inside the MC body and not allowing the piston to completely return to the rear of the body. The fluid level in the MC never got lower than 1/2 full. It's not a problem with runout as the car is not being moved, other than up & down on the jack stands. I talked with CSSB tech department this morning and he told me the MC had to be pointed downward toward the front when bleeding to insure all air was removed from inside the assy. at the rear, otherwise air could be trapped here. Anyone ever heard of this?? Anyway, he told me to do this & if it didn't work, call back, and they would send me a new MC. I'm not sure if some of the air I saw in the lines when my wife was PUSHING the pedal SLOWLY, was from within the lines, or being pulled into the hose at the bleeder threads. I tried to keep the bleeders turned only approx. 1/4 turn when manually bleeding, so I don't feel that the air was siphoned past the bleeder threads. Anyone have thoughts on this as a possibility. I also tried to re-tighten the bleeders before she had the pedal fully depress each time (not sure how successful this was). Again, all fittings have been checked for tightness and seepage by visual, fingertip, and using a shop towel. I don't see any leakage around the calipers, but cannot fully rule that out. I don't have hose clamp-off devices, but was wondering if grip pliers would severely damage the hose if the hose was wrapped with something prior to clamping down on it. I also wondered on 2 other possibilities, 1) the MC itself and 2) the new safety distribution switch. The switch is tightly screwed into the block. What else? Open to opinions on the above questions and wonderings.
Originally, the MC was bled on the car, but was removed and bench bled on the vise (and no, it was not clamped down too tight-just the opposite). It has been taken off the car as recently as yesterday and bled again on the vise again. Then did the gravity flow to the calipers and as Ed Johnson suggested, I started with the drivers side, followed by the passenger side, then the right rear inner bleeder, followed by the RR outer bleeder and on to the driver's side inner bleeder and finished up on the driver's outer bleeder. The MC was completed disconnected from the booster and allowed to hang by the fluid lines during this process to eliminate any possibility of the engagement rod holding the MC piston slightly forward inside the MC body and not allowing the piston to completely return to the rear of the body. The fluid level in the MC never got lower than 1/2 full. It's not a problem with runout as the car is not being moved, other than up & down on the jack stands. I talked with CSSB tech department this morning and he told me the MC had to be pointed downward toward the front when bleeding to insure all air was removed from inside the assy. at the rear, otherwise air could be trapped here. Anyone ever heard of this?? Anyway, he told me to do this & if it didn't work, call back, and they would send me a new MC. I'm not sure if some of the air I saw in the lines when my wife was PUSHING the pedal SLOWLY, was from within the lines, or being pulled into the hose at the bleeder threads. I tried to keep the bleeders turned only approx. 1/4 turn when manually bleeding, so I don't feel that the air was siphoned past the bleeder threads. Anyone have thoughts on this as a possibility. I also tried to re-tighten the bleeders before she had the pedal fully depress each time (not sure how successful this was). Again, all fittings have been checked for tightness and seepage by visual, fingertip, and using a shop towel. I don't see any leakage around the calipers, but cannot fully rule that out. I don't have hose clamp-off devices, but was wondering if grip pliers would severely damage the hose if the hose was wrapped with something prior to clamping down on it. I also wondered on 2 other possibilities, 1) the MC itself and 2) the new safety distribution switch. The switch is tightly screwed into the block. What else? Open to opinions on the above questions and wonderings.
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