Question about long tube method of brake bleeding |
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Question about long tube method of brake bleeding |
computers4kids |
Nov 26 2011, 10:42 AM
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#1
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Love these little cars! Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None |
I have some air trapped in my brakes and want to try the long tube method to purge. With the tubes in the resevoir and connected to each caliper nipple, I understand the idea of cracking each nippple open and pumping until the cows come come.
What puzzles me is the idea of injecting air back into the system using this method. Until the lines are full of fluid, won't you be sucking air on each pump of the brakes back throuh the nipple from the empty tubes? I have a motive bleeder but can't seem to get all the air out. It takes a couple pumps to get a hard pedal. New MC All new rebuilt calipers, etc Used the pedal pump and release method Flushed a 1/2 gallon of fluid throuh the calipers Rear vented to .004 Driven the car and repeated the bleeding with motive and two people Yes, the front caliper nipples are pointed up No speed bleeders (IMG:http://www.914world.com/bbs2/uploads/post-419-1182989448.jpg) |
IronHillRestorations |
Nov 26 2011, 02:03 PM
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#2
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I. I. R. C. Group: Members Posts: 6,731 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
Here's how I bleed a 914 brake system, from my post back in Mar 05.
Remember the "Search" function is your friend! Get a spare cap for the brake fluid resevior. Get a tire valve & stem. Drill a hole in the center of the resevior cap, the same size as the hole in a wheel (or measure the narrow part of the tire valve). Pull the valve stem through the hole. Remove the plastic screen in the resevior. Fill the brake resevior completely, not to the fill line, all the way full to the bottom of the tube that holds the plastic screen. Put on your new modified pressure bleeder cap. Drain your air tank to 10 psi, for cheaper compressors setting the regulator at 10 psi may not work. If you put too much pressure in the system, you'll blow off the blue lines that connect the supply lines to the resevior, or worse. Take a clip on air chuck and clip it on your new pressure bleeder cap. Bleed the brakes, starting at the furthest bleeder from the master cyl, and finish at the bleeder nearest the master cyl. Bleeding sequence (RR-LR-RF-LF) EDITED FROM ORIGINAL POST Pump the pedal hard about ten times and repeat the proceedure. Do not get brake fluid on painted surfaces it will ruin them. If the pressure bleeder cap retains pressure, bleed it down before taking it off the resevior. This works very well, and makes it a one person job. Replace brake fluid every two years. Properly discard used brake fluid. |
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