1994 Isuzu Trooper • 6 cylinder 4WD Automatic • 176,850 miles

My 1994 isuzu trooper brake pedal goes to the floor. I replaced power booster master cylener bleed the brakes they still went to the floor. Then after 2 days went back out and bleed them again and they started working. Worked for about a week then they started going back to the floor again. No leaks anywhere. Checked the vacuum line check valve seemed o k. No signs of cracks. Bleed the breaks once more. Lots of pressure in dack celipers but not much pressure in the front calipers help. Disk brakes allfour
November 26, 2010.

If there's no external leak double check the master cylinder for an internal leak and also if it has an ABS unit check that too!

Nov 26, 2010.