Truck is a 99.5 F-250 Super Duty Diesel. Has 160K miles. Stock master, Aftermarket flex lines, bleeders are Russell Speed Bleeders.
I have been having a continuing issue with a mushy brake pedal, pedal firmness changes all the time, sometimes its firm, other times its soft. I figured it was just air in the system. I got around to bleeding the brakes a few weeks ago. Didn't have any issues until I got to the right front wheel, where I found air in the lines, it was mainly small bubbles nothing to be concerned about. I ran out of brake fluid before I could finish completely bleeding that wheel so I had to stop.
I tried bleeding the brakes again today, didn’t have any issues until I got to the front. This time both front wheels had air in the lines as I bled them, never seemed to get any better or worse as I bled. Some decent sized bubbles, but really just a lot of small bubbles suspended in the break fluid. I went through about ¼ a gallon of fluid doing the bleeding today.
I never let the master cylinder get below 1/2 full, so I doubt I introduced air into the system. I checked around and didn’t see any evidence of fluid weeping from the distribution blocks, lines or master.
Anyone have any ideas? Do I have a bad master cylinder? Any help/comments/suggestions are appreciated.
Thanks,
Dave
I have been having a continuing issue with a mushy brake pedal, pedal firmness changes all the time, sometimes its firm, other times its soft. I figured it was just air in the system. I got around to bleeding the brakes a few weeks ago. Didn't have any issues until I got to the right front wheel, where I found air in the lines, it was mainly small bubbles nothing to be concerned about. I ran out of brake fluid before I could finish completely bleeding that wheel so I had to stop.
I tried bleeding the brakes again today, didn’t have any issues until I got to the front. This time both front wheels had air in the lines as I bled them, never seemed to get any better or worse as I bled. Some decent sized bubbles, but really just a lot of small bubbles suspended in the break fluid. I went through about ¼ a gallon of fluid doing the bleeding today.
I never let the master cylinder get below 1/2 full, so I doubt I introduced air into the system. I checked around and didn’t see any evidence of fluid weeping from the distribution blocks, lines or master.
Anyone have any ideas? Do I have a bad master cylinder? Any help/comments/suggestions are appreciated.
Thanks,
Dave