Working on a 1977 Delta 88 Oldsmobile. Trying to bleed the break lines, possible air in the break lines. No leakage indicated, and the master break cylinder stays full, all except when bleeding of course. Now, when bleeding rear breaks first everything was going great. When I did the front passenger break it lost air presure, the break peddel went to the floor. I started over again, had an assistant pump the break peddel 5 times to build up presure, to push air out of the rear break line, nothing happened, no fluid, air bubbles, nothing.
Now, pumping break peddel, doesn't build presure, just goes to the floor when trying to bleed the break lines. What could have went wrong?
You need to hold in the metering valve.when you bleed the front brakes.long as the valve closed off you wont be able to bleed front brakes.better to get extra help.hard to bleed by your self .
look at all brake lines from combination valve.to brake hoses on brake caliper and wheel cylinders.make the calipers and wheel cylinders are not leaking at seals.if you cant find no leaks problem in the master cylinder.look at all brake lines from combination valve.to brake hoses on brake caliper and wheel cylinders.make the calipers and wheel cylinders are not leaking at seals.if you cant find no leaks problem in the master cylinder.
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Well replacing the caliper without bleeding the brakes you would of had to of pressed on the break pedal and held it down before opening the break line. Just letting the brake fluid leak out completely introduces air into your brake .
You have a vacuum leak in the system causing several problems.
You will need to inspect vacuum lines from motor to brake master cylinder and to the A/C system. Just run your fingers down the lines looking for a burn or a brake in the line. Once you find the problem you can use a two inch piece of rubber fuel line or vacuum line to do the repair. The part should cost you no more than a Dollar if they charge you anything at all for a small piece of rubber.
Have you checked your Master Cylinder to ensure that it's full of fluid? If it is empty the best way to bleed the brakes in that case would be to add fluid and then break the caliper bleeders loose and let gravity do its thing. Gravity bleeding is the best way to make sure you don't trap air in the brake system. Make sure you keep the master cylinder full of fluid while gravity bleeding. Run approx 2 reservoirs full to make sure that you have no more air in the line! And you should be done. Also, the vehicle does not need to be running to gravity bleed. Good luck!
You are either low on brake fluid or you have a vacum problem. It is a long shot but possible the Master Cylinder is having an issue or an air bubble in the system. Start the vehicle and make sure it is blocked. With the engine running perform system bleeds on all four calipers. Pump 3 times then release bleed valve. You are going to need a couple bottles of brake fluid to bleed all these calipers and get the air out of the lines. You should make sure the primary vacum is connected to the master cylinder and that there are no leaks on any lines before you start the bleeding process.
Start at the master cylinder and bleed ,then the right rear,then the left rear,and right front,then the left front wheel.You should not have to bleed the brakes to install brake liners.
There is probably still just some air in the system, it only takes a small amount to have no pedal. Did you bench bleed the master cyl before installing? Start bleeding the brakes again, start with the wheel the greatest distance from the master cyl. bleeding until no air is evident, working your way closer to the master cyl, doing the closest wheel to it last. Check all the new brake line connections. A slightly loose connection would allow air into the system, making it impossible to bleed it all out. Make sure the master cyl level never drops too low, or you will be pulling in air and have to start all over. Good luck.
Sounds like you have a blockage in the brake line going to the back breaks...maybe a kink in the brake line or maybe the junction piece (found attached to the bell housing in the back) that sends brake fluid to both breaks in the back is bad. Or your rear breaks need to be adjusted... I would say brake cylinders, but I doubt both would go out at the same time. Also check to make sure your master cylinder is working ok and there is no air in the line...try bleeding the back brakes to see if any fluid is getting to the brake cylinders in the back, this will tell you if you have a kink in the line or air...if it bubbles when you check (bleed the lines) then your problem is air in the line and should be bled until you get a solid flow of break fluid with no bubbles at all. If you want to know how to bleed the rear break just write me back and I will instruct you on how to do that.
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