1995 Isuzu Trooper Master Cylinder

1995 ISUZU TROOPER
Avatar
TROOPER13
  • MEMBER
  • 5 POSTS
Brakes problem
1995 Isuzu Trooper 6 cyl Four Wheel Drive Automatic

I replaced the master cylinder in my trooper and bled all 4 wheels. When the trooper is off the breaks are great, and when its on the breaks go to the floor... what gives?
Jul 4, 2009 at 11:42 AM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
If there's no actual leak within the brake system-double check the brake master cylinder could be defective regardless if its new-
Jul 4, 2009 at 11:50 AM
Avatar
TROOPER13
  • MEMBER
  • 5 POSTS
How would you check it?
Jul 4, 2009 at 11:54 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Remove the brake lines from the master cylinder and plug it-then apply pressure-if it sinks in half way-you've found your problem
Jul 4, 2009 at 4:31 PM
Avatar
TROOPER13
  • MEMBER
  • 5 POSTS
I was unable to get something to block the brake line holes. I have taken the master cylinder off. After looking at an online diagram at myisuzuparts.com of the master cylinder, I noticed that 2 parts are missing. What the diagram calls a retainer frt shell m/vac, and the seal m/vac. Do these parts typically come with the master cylinder?
Jul 5, 2009 at 1:17 PM
Avatar
TROOPER13
  • MEMBER
  • 5 POSTS
I have gotten a new master cylinder and the brakes felt better. Then I turn on the car and the brakes still go to the floor. Is there a specific sequence in bleeding the brakes, Am I missing something else?
Jul 6, 2009 at 10:14 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Check the calipers/wheel cylinders if they're leaking if not bleed the brakes from RR/LR/RF/LF
Jul 6, 2009 at 10:19 AM
Avatar
TROOPER13
  • MEMBER
  • 5 POSTS
That is the same way I bled the brakes.. I got lots of fluid and little to no air. While the car was off the brakes felt firm, then I was going to take it for a test drive and turned the car on. The brakes went to the floor and the rear abs and parking brake light came on. After checking the lines again I got discouraged and went to search for other things online about the brakes. I went back out and started the car.. the lights are off, the brakes still go to the floor, and there is a loud clicking coming from the shifter when I apply the brakes. Thoughts?
Jul 6, 2009 at 10:54 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Check the ABS unit
Jul 6, 2009 at 10:56 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.