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I think I went too far and pushed in the master cylinder seals (pedal sticks to the floor) PLEASE HELP????

posted by  someone claiming to be 747 on  Wed May 25 01:59 CST 2005 [RELATED]

Greetings:

I think I went a little too far when attempting to bleed the air from my front brake calipers? Also I did it while the car was running. My helper built up pressure via a series of pumps to the pedal. I then instructed them to hold the pressure while I would open the lower bleeder screw. Lots of fluid and or air would then pump out. I would close the bleeder, and then instruct them to release the pedal thereafter. Well while working on the second front caliper (passenger's side), the pedal got stuck at the very bottom of the floor! I have read that my master cylinder seals could have been pushed into a corroded area of the master cylinder? I have 2 donor master cylinders on hand (new like condition) ATE non-abs for 85-92 740 8 valves (dual piston girling calipers) single rear pistons. The only difference is one of the calipers has 2 bleeder screws on the side of it, in addition to all of the required line connections. The other master cylinder is just regular and doesn't have any bleeder screw additions. Both are ATE and were pulled off of 90/92 740 gle wagons with 8 valve engines (low mileage) aw-70 A.T. Could I use the bleeder screw version? Would I have to bench bleed, or could I just do a general bleed from the calipers? What does bench bleeding a volvo mc entail? What would be the recommended tools (mechanically inclined). I think when I was bleeding the system half strokes were not applied, thus causing my pedal to push pass the seals. The dealer wants 140.00 just for a mc kit!!! I opt to use one of my donor mc. One last thing. Is my servo booster ok, I have a new valve (white plastic insert/hose connector) to put in. Please all of your help would be greatly appreciated!!! THANKS IN ADVANCE

1989 740 GL 8 VALVE NON-TURBO NON-ABS AW-70 A.T. Excellent condition 393,000 MILES






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