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Brake pedal goes all the way to the floor , just blead all four wheels , and the master cylinder , but it still goes all the way down , what can be some options for what its doing and fixing
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Did you get a good bleed with fluid coming out at all four wheels? If they bled good, and the pedal still goes to the floor, you need to check the brake master cylinder-it is probably shot with an internal leak. An internal leak will not let fluid pressure build up, so no brakes.
Did you keep the brake fluid reservoir from going dry while bleeding? If it went real low, air might have got back into the lines.
It is not uncommon when bleeding brakes on an older vehicle for the master cylinder to suddenly develop an internal leak and require replacement . Here's why: pushing the pedal all the way to the floor causes the master's piston to push in farther than ever before. The rubber cups then travel over a section of the cylinder not usually touched by the cups-old fluid can develop a crud there and when the piston pushes over it, the cups can get ruined. To avoid this when bleeding brakes, put a short piece of 2X4 wood block under the pedal. Then the pedal will not extend the master's piston beyond it's normal travel. Of course on a new master cylinder, you do not have to do this. A new master cylinder does require bench bleeding before installing, however, to ensure no air pockets develop from there.
you have air in the lines....must be blead from the furthest wheel cylinder first going forward to the closest one to the master cylinder. then bleed the master cylinder last
Check your parking brake. if it goes down to the floor or does not hold, then your back brakes needs adjusted. bad master cylinders bleed off slowly to the floor while pushing on the brake pedal. If you need assistance on adjusting let me know.
Randy
check your master cylinder and booster see if you see a fluid leak if not then take cap off resivior and open bleeder valves just enough to let them bleed out on all four wheels KEEP THE RESIVOIR FULL OF BRAKE FLUID while your doing this .. this procedure should take about 45 min
Is the brake-light on? I understand what you replaced but what was the procedure that you followed to bleed the brakes? Did you bench bleed the master? After installing the new master, did you bleed air out of the proportioning valve, and all four wheels. You need to start with the F/L wheel and finish with the R/R wheel. Unless you own and are using an automatic brake bleeding unit. You will have to get another person to help bleed them.
must still have air in system or a bad new master cly.make sure you bleed all 4 wheels.could take awhile if you did not bench bleed the master cly first.
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