I have a 2000 Nissan Frontier, the brakes started going to the floor the first time you applied them, but would pump up. It was thought to be the master cylinder, after 2 new master cylinders it still is doing the same thing.
No brakes the first time you hit the pedal will pump up the 2nd time you hit it. Replaced master cylinder and bled the system but it still does the same thing.
If rear drum check linings and rear adjustment, start here.
April, 21, 2012 AT 2:23 AM
MAYBE YOUR BLEEDING TECHNIQUE IS NOT BEING DONE JUST RIGHT
My Bench bleeding ain't on the bench...it's on the vehicle!
Much EZer that way!
This can be done on the vehicle (my preference) using two people, one pumping and one monitoring the Master Cylinder.
I wrap string loops around the little hoses and tie a knot, as to keep the tubes from blowing off of the plastic adapters.
I take it one step further, by squeezing the little hoses with my fingers (as if I were a check valve) The VERY SLOW PUMPING OF THE PEDAL will push the fluid into the reservoir, SCOOTING BY MY PINCHING, but the pinch will not allow it TO S.UCK AIR BACK, as you see in the beginning of this video....My way makes things faster, but if you did not tie the hoses to the adapters--THEY WILL BLOW LOOSE (lots of adjectives will be bust loose out of your mouth!)
KEEP FLUID IN THE RESERVOIR AT ALL TIMES/ CONSTANTLY CHECKING!
START WITH FURTHEST OUT WHEEL CYLINDER, FROM THE MASTER CYLINDER, WORKING TO THE CLOSEST (RR, LR, RF, LF)
2 PEOPLE, ONE PUMPING, OTHER BLEEDING AND REFILLING
#1 man is the Bleeder
#2 man is the Pump Man
1-MAN BREAKS BLEEDER LOOSE-SNUGS IT BACK YELLS, "PUMP IT UP"
2 MAN-PUMPS 6-8 TIMES (YELLS "PUMPING") THEN HOLDS PEDAL--YELLS, "HOLDING"
1-MAN CRACKS BLEEDER...AIR/ FLUID SPURTS OUT
2-MAN YELL, "FLOOR", JUST BEFORE THE PEDAL, ACTUALLY HITS THE FLOOR
1-MAN TIGHTENS THE BLEEDER....WHILE IT IS STILL SPURTING OUT (NOT AFTER IT STOPS...OR IT WILL SUCK AIR BACK IN).....THEN YELLS, "OKAY---PUMP IT UP"
PROCESS STARTS OVER UNTIL YOU ARE SATISFIED, WITH EACH WHEEL
THIS DOES NOT MATTER WHETHER THEY ARE DRUM BRAKES OR DISC.
ON DRUM BRAKES:
YOU SHOULD ALREADY HAVE THE SELF-ADJUSTERS PUSHING THE SHOES CLOSE TO THE DRUMS, SHOES SLIGHTLY TOUCHING THE DRUMS , BEFORE YOU DO THE BLEEDING PROCEDURE.....THIS WILL KEEP YOU PEDAL AT THE TOP AND TIGHT.
I PREFER THIS OVER USING THE ONE MAN, HOSE AND CUP, METHOD WHERE YOU SUBMERGE THE HOSE AND PUMP....TO ME THIS IS FASTER AND MUCH EZer.