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Posted on Jan 02, 2017
SOURCE: 2001 Mustang GT rear brake job
yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.
Posted on Oct 12, 2008
Did you put fresh fluid in the master cylinder? I really think you still have air in the lines. To bleed manually, start with the bleeder the greatest distance from the master cylinder, car running, helper pushing down about half way on brake pedal and releasing 3 times, on 3rd time, holding pedal down to half way depressed point while you open the bleeder valve. Repeat until you are sure all air has been flushed out. Check master cyl reservoir level often, because if it gets low and you **** air into the system, you have to start all over again. Go to wheel next greatest distance from master cyl, repeat above, working your way to wheel closest to master cyl last.
Posted on Apr 12, 2009
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.
Posted on Apr 29, 2009
First look for obvious leaks under the vehicle, especially the inside area of each wheel... If you see fluid, you have either a blown cylinder seal or a bad line (check the rubber hoses to the front and back brakes too) Repair the offending part and bleed the air out of the system... (remember to clean pads or shoes if they have fluid on them)... If you see no hint of leakage anywhere, then suspect the master cylinder... if you remove the master cylinder, check and make sure that it didn't leak fluid into the brake booster diaphragm (Brake fluid will destroy the booster)... as in any repair when you open the system (lose fluid), you will need to bleed out the air to restore function... hope this helps...;-)
Posted on May 04, 2009
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I recently had to replace the master cylinder of my hydraulic clutch system. This was easily done as it comprised only one fluid line..and two bolts. Once the new master cylinder was mounted however, I found that air had gotten into the line..and adamantly refused to leave.
I undertook all of the common methods of removing this air but to no avail. I tried bleeding the system from the slave cylinder. I tried opening and closing the bleeder valve at the slave cylinder while someone pumped the clutch pedal for me. I tried using a vacuum pump to pull fluid and air out of the system. Each and every effort failed.
Air in a hydraulic line is a for certain way to insure that the hydraulic function will NOT occur. Air is compressible. A fluid is not. So when you place you foot on a brake pedal, or a clutch pedal and apply pressure, the non-compressing nature of that fluid, allows that fluid to behave as if there was an actual physical link in action. As an example..if there was a steel bar attached to your brake pedal..that would activate the brakes when you stepped on the brake pedal...that bar would be an actual, physical, material link..from pedal to brake shoe. A hydraulic line is very similar. When you step on the pedal..there is a force applied to the brakes..by the non compressing nature of the fluid..within that line...the force applied on that pedal, is instantly applied at the other end of that line...unless..there is air trapped within that line. The air will compress..stealing energy..and will not transmit the force applied.
I did a great deal of searching online trying to find a method of removing this air from my hydraulic clutch system and discovered some of what was causing the problem. The Bore of the piston inside the master cylinder is small...and the stroke or forward movement of that piston..is rather short. There just wasn't enough movement of fluid going on to force the air out of the system in a reasonable amount of time. But my search did bare fruit finally..I found a wonderful article on refilling a hydraulic clutch system..that eliminates air, takes only a very few minutes and is not at all expensive.
What you need is one of those oil cans that has a spout and a trigger that will squirt the oil for you. This trigger...should be of the type that requires your index and middle fingers to operate as opposed to a can that has a thumb trigger. You will also need a length of clear plastic tubing that will fit snugly over the end of the oil can's spout..and will also fit snugly over the end of the disconnected fluid line at the slave cylinder.
In practice..it's very easy. Remove the fluid line from the slave cylinder and allow the system to bleed out entirely. While that is going on, fill your oil can with fresh clean brake fluid. Attach the tubing to the spout..and once the system has bled out..attach the other end of the tubing to the fluid line. Start pumping...just regular timed pumps are needed. Not too fast. This fluid, coming in from the bottom..fills the system from the bottom..UP..and pushes any air right out through the master cylinder. Take a peek at the master cylinder every now and again. When you see it beginning to fill with fluid...go ahead and fill it completely with brake fluid. Slip under the vehicle, re-connect the fluid line, pop open the bleeder on the slave cylinder..watch for fluid to come out...tighten the bleeder close again..and you are finished.
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