How do i build pressure to front brakes after replacing all the brake lines and bleeding them several times.

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.

Hi Tommy, I'm glad to help! There are only 5 things that can cause brakes to hold: (1) Calipers are sticking. NOTE: There are several reasons calipers stick, there are internally frozen meaning you need new calipers. Here's how to check them release the nut that holds the hose to the caliper when the fluid bleed out and the calipers do not release pressure from the brakes then they are internally frozen, replace them. (2) Hose's are calapsed internally. You check the hoses in the same way, release the bolt and if the calipers DO Release pressure from the brakes then you know it's the hoses. (3) The actual metal lines going to the back of the Vehicle could be damaged. Example: One time one of the rear brakes would not release pressure and I found where the line goes acroos the rear axle something had hit the line and smashed it flat and so it was holding brake pressure on the wheel. (4) Let's not forget how much dirt and grime builds up on the brakes themselves. Example: I found one time where the LANDS where the brake shoes slide were so dirty that the brake pad itself was stuck and holding the brake pressure on that wheel. (5) The Master Cylinder, not very often, but I have seen the ports in the master cylinder clog-up and will not bleed back to release brake pressure. This is a few thing for you to check out that will help you find the problem yourself and save you money. Hope this helps and have an awesome day Tommy.

sounds like the brake master cylinder seals are worn buy a master cylinder kit and get a mechanic to repair it it is a lot cheaper than replacing the whole unit

check it in front of the hose you may have a bad brake hose.

Yes, try bleeding the brakes again, you may have to bleed the front brakes too. when the master cylinder goes dry from a broken line sometime air gets into the front lines also. otherwise the master cylinder could be bad when the pedal goes past it normal travel sometime it tears the seals inside and you be unable to build pressure in the master cylinder

try bleeding them more,start with the right rear,then left rear,then right front ,then left front, always bleed the brake that is furthest from the master cylinder, sometimes you have to bleed them several times until you get a steady stream of brake fluid.

do you mean that you pump the brakes to build up pressure in order to stop?

bleeding brakes requires you to bleed them from each wheel starting at the right rear. procede as follows: have someone sit in the drivers seat. have them pump the brakes slowly and forceably to build up pressure. maintain force on the pedal. starting at the right rear, open the bleed screw slowly. the pedal will go to the floor and the fluid will drain. hold the pedal to the floor and tighten the bleed screw. repeat this procedure several times until you are sure there is no air in the line. follow these steps at each wheel- left rear, right front, left front. keep reservoir filled with fluid. fill after each wheel. (note) get a length of rubber hose that fits snuggly over the end of the bleed screw
and drain fluid into a container.

i think you were draining the anti-lock brake system. in which, case follow the steps above for that also.

You have to check your master cylinder, pump your brake several times and hold it, see if is going down to the bottom, if does, the master cylinder is wrong, check the brake pressure hose, maybe you have some air in your brake lines, be sure you have enough brake fluid

did you possibly replace brake lines with standard instead of metric lines.The standard lines will fit but you will not get pressure back

hello i think you should have the system power bleed with a power bleeder theres a good chance the plunger in the proportioning valve is sticking if you have this truck power bleed it will push out the old fluid replacing with new usually if theres any type of contaminates especially oil ,or power stewering put into master by mistake it would swell any rubber piece to the point of a hard pedal and nothing working then you would have to replace everthing like your being told the only thing you could still use would be the lines wich would have to be cleaned with denature alcahol i would have it bleed in sequence firthest tire down to the closest to the master goodluck