Sometimes the bleed screw is clogged. Remove the bleed screw and inspect the bleed hole in it.
Sounds like the safety valve is not centered in its fixture. What happens is the system has diagonal braking control which is used to prevent the complete loss of brake fluid. This shuts off the wheel that is losing pressure from complete fluid pressure loss One front wheel and one diagonally opposed rear wheel are used so that the car will not pull left or right when stopping.
The situation may clear if you attempt to bleed the brakes using the longest line first and progress to the shortest line last.
There are different ways of bleeding brakes. A suction method is used by manually pumping a Vacuum pump on each brake bleeder to draw the fluid out as well as any air. A power bleed is when a pressurized canister is attached to the Master cylinder and fluid is forced through the lines without pumping the brakes. Gravity bleeding is when all bleeders are cranked open and fluid is allowed to leak out of the cylinders for a period of hours. Theory is that at some point, a suction will be created in the system and some fluid will be retained. Pressure is assumed to equalize as Gravity affects each bleeder the same. In all cases, the safety valve will recenter itself to restore all 4 brakes.
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SOURCE: 1998 chevy C-1500 brake problems
Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps.
Good luck!
SOURCE: no fluid come out when bleeding brakes drivers side front
Brake rubber flex line could be collapsed,,or kinked,,,i suggest loosening of the line at the master cylinder distribution block (this will give you the ability of loosening off one line at a time,,and have some one push the brake pedal down,,if you see fluid at this point then you know it has to be the line or the caliper.
if you get no pressure from the distribution block then its the master cylinders fault
SOURCE: Problem bleeding the brakes
ITS POSS FOR IT TO BE THE WEIGHT VALVE IF THERE ONE FITTED IF YOU LOOK UNDER THE CAR NEAR CENTER OF REAR AXLE YOU SHOULD SEE A BOX WERE THE BOTH SIDES BRAKE PIPES GO TO THIS SHOULD HAVE A ARM ON IT WITH A SPRING.. THIS WORKS WHEN YOU PUT EXSTRA WEIGHT IN BOOT ETC IT ALTERS THE BRAKING POWER TO HELP WITH THE WEIGHT ETC. THIS IS PROB FAULTLY ,, AND NOT LETTING TO FLUID FLOW BACK
SOURCE: 98 chevy S10.Tried bleeding brakes,Front ok,Rear not reacting
Check the master cylinder and make sure it is working correctly and both resevoirs are full.
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