Brakes are not working and filling it with brake fluid doesnt seem to work. how can you check the brake lines and how do you now if one is broken on a 1995 cutlas ciera oldsmobile?

you have a leak brakes are a sealed hydraulic system so when no fluid some part is leaking look under vehicles for fluid also when you fill an empty reservoir you add air also but look for leak

check the level of dot 3 oil in the reserves...remember you replaced the lines and air has gotten into it- ti may take a bit to fill caliper..
if this doesnt work there might be a problem with the brakes fluid dispersion- it regulates the amount of fluid to each wheel...

Check the fluid level in the brake resivior. It sounds like you have a leak. Check all the brakes and look for ruptured lines or a leaking caliper. If no leaks at the wheels and along the brake lines the issue would be the master cylinder or hydo boost unit.

if the master cylinder is full of brake fluid, then replace the master cylinder, if master cylinder is not full of fluid then fill with DOT 3 brake fluid pump brakes and look under truck for leak.......GOOD LUCK

Your master cylinder is worn out and must be replaced. Unless you are a skilled backyard mechanic, get this fixed professionally. This needs to work every time correctly - no room for error when it comes to stopping your vehicle.

Thanks for your question today.

fill master cylinder and leave the rear nipple open overnight and see it runs through ,if that doesnt work then another trick is to fill master cylinder then put a brick on brake pedal so it holds it down or a broom handle jammed against the seat and leave overnight and with the master cylinder open as such then the air might rise up

Replace the leaking line, then bleed the system of all the air in the lines. Start at the furthest point from the reservoir. Until there is no air bubbles in the system.

I would suspect there is either a crack in your brake line. the fluid has to go somewhere if youre having to refill the reservior. Maybe they didnt bleed them after the work was done, and had an air bubble and when you applied pressure is blew out a fitting. needs to be checked out though for sure!

one gose to the parts store and get the broken part . find the master cylinder reservoir , when at parts store find out what kind it fluid ittakes. refill reservior with brake fluid .put on your safety glasses raise side of that is broken remove wheel , place on jack stand. remove broken part try not to let all the fluid drain from reservior. may have to use a trick or two to get it off but it dose come off , install new one ,check fluid again top off if necessary . IT VERY VERY IMPORTANT IT DOSE NOT RUN DRY. start at the farest brake ,on the back of where the tire gose there is a small nut with a hole running throw it that is called a bleeder valve. 2 people will be needed 1 in the kar and 1 to say hold it back to the back side of tire loosen bleeder nut then re tigthen hand tight.then yell ok the person inthe car will pump the brake paddle 7 to10 ten times slowly press to floor then back up1 one thousand then down again a thousand between each pump. after 7 to 10 pump the car person will yell ok and hold down the brake then the under buddy turns the bleeder nut open,letting out air trapped in the lines repeat until you get a good stream of fluid. move to other side of car, car person will re fill reservoir putting cap back on reservior each filled bleed the brake same way . by this time the paddle should be getting hard not going to the floor. if it is recheck brake line work for leaks . if not game on after back is done recheck fluid move to front .do the one not broken first then broken last paddel should be hard like you have brakes don t forget to top off fluid again . then turn hard. if it is you are done if not look for leak and fix
once the car is in action it may or may not have to be done again goood luck DONOT STRIP BLEEDER NUT

bleed the sistem