AFTER BLEEDING THE MASTER CYLINDER ON THE BENCH, DID YOU BLEED IT IN THE CAR, IF NOT, OPEN THE LINE AT THE MASTER 3/4 TURN OFF, HAVE SOMEONE STEM ON THE BRAKES, DO IT SEVERAL TIMES UNTIL YOU SEE FLUID ON BOTH LINE NO AIR COMES OUT, THEN WITH THE KEY ON START FROM THE RIGHT REAR WHEEL , SOMEONE PUMPS AND HOLDS THE BRAKES AND YOU OPEN THE BLEEDER 3/4 TURN, THEN LEFT REAR , THEN RIGHT FRONT AND LAST LEFT FRONT, IF NO PRESSURE AFTER OPENING 4 OR 5 TIMES, OPEN THE SYSTEM BY THE BRAKE HOSE, BEFORE THE CALIPER, IF PRESURE THERE REPLACE THE HOSES. 14 YR OLD HOSES MAY BE INTERNALLY CRACKED. NOT ALLOWING FLUID TO GO THRU.
Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.
SOURCE: Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?
Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!
SOURCE: no brake pressure
should not need to bleed module try giving the proportion valve afew good smacks sometimes this will dislodge the valve then rebleed
SOURCE: brake pedal dropping to floor
do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.
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