I just purchased an 04 Trailblazer LT. There were no brakes on the truck and upon further inspection, it was discovered that the right rear line had been cut. Also, the booster was disconnected from the pedal. I replaced the booster and the broken brake line but still not much fluid at the right rear caliper. I replaced the caliper and the master cylinder as well and I have fluid coming from the master cylinder but still only very little fluid at the rear cylinder. I have inspected the line from the master cylinder to the caliper and I cannot find any damage or blockage. Any ideas where the problem may be?

 

This problem is with the left rear not right rear?

 

On my 99 blazer, I had a metal bracket around a rubber hose swell from rust, which in the end caused my caliper to constantly fail.

different vehicle and setup, but could be a possibility if you have brackets holding rubber lines...