 Master cylinder, How you know when its time.................. |
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| eyecolor |
 May 3 2010, 04:31 PM
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Eyecolor  Group: Members Posts: 80 Joined: 15-August 08 From: Wilmington,DE Member No.: 9,425 Region Association: None 
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I have 4 beautiful rebuilt calipers thanks to Eric and PNB . I have already used 2 quarts of fluid and the pedal is still soft.
I have been very careful to bleed in the proper order with no air being introduced. The back calipers close nicely during the pumping and the fronts move a little. I did note someone mentioned bleeding the proportioning valve. I have no leaks anywhere!! Is it time to replace the master cylinder or am I giving up too soon. I also have an an old pedal cluster that I may owe someone as a core replacement. Let me know if it is you or I can send it to anyone with the best advice that can use such a mess. thanks George Wilmington,DE |
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| davesprinkle |
May 3 2010, 10:33 PM
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#2
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Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None
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Typical symptom of a bad mc is that the pedal slowly travels to the floor. (This is with all bleeders closed.) If your pedal doesn't do this, then your MC is OK.
Try the "long tube" bleeding method. Get 15' of 1/8" ID clear vinyl tubing at your hardware store. Drop one end into the master-cylinder reservoir. (I tape the tube onto the fender to ensure that it doesn't fall out.) Put the other end on a bleeder. Open the bleeder. Sit in the car and pump the crap out of the pedal. Over and over. You'll see the bubbles chasing themselves through the loops of the tubing. Keep pumping until you don't see any more bubbles. No need for a helper and no need to waste fluid. Do this for all 8 bleeders. BTW, you did adjust the rear venting clearance, right? QUOTE(eyecolor @ May 3 2010, 03:31 PM)  I have 4 beautiful rebuilt calipers thanks to Eric and PNB . I have already used 2 quarts of fluid and the pedal is still soft. I have been very careful to bleed in the proper order with no air being introduced. The back calipers close nicely during the pumping and the fronts move a little. I did note someone mentioned bleeding the proportioning valve. I have no leaks anywhere!! Is it time to replace the master cylinder or am I giving up too soon. I also have an an old pedal cluster that I may owe someone as a core replacement. Let me know if it is you or I can send it to anyone with the best advice that can use such a mess. thanks George Wilmington,DE |
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Posts in this topic
eyecolor Master cylinder May 3 2010, 04:31 PM
dr914@autoatlanta.com yes I would say that it is time to replace!... May 3 2010, 04:48 PM JamesM Did you replace your rubber lines as well?
I hav... May 3 2010, 05:08 PM
eyecolor I did replace all the flexible lines May 3 2010, 06:01 PM PanelBilly I had all new lines and rubber. It seems to take f... May 3 2010, 05:21 PM eyecolor Thank you Dave and Zach and the all the rest
Gre... May 4 2010, 01:48 PM Vacca Rabite :agree:
try the long tube method before replaceing... May 4 2010, 08:15 AM |
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