Yet another blake bleeding question |
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Yet another blake bleeding question |
florida 914 |
Mar 21 2015, 09:17 PM
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#1
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Newbie Group: Members Posts: 29 Joined: 29-September 10 From: Salem, OR Member No.: 12,227 Region Association: Pacific Northwest |
Sorry, folks, for asking yet another question about bleeding brakes, but I can't find the answer to this specific question and am at wits end.
I have a 1971 914. I am only able to get about a quarter of a pedal, i.e. it is off the floor, but only just, and no more improvement no matter how much we go through the routine. What seems weird is this: when I open the rear bleed nipples, the pedal goes to the floor (as my assistant pushes), but nothing like that happens on the front. I don't see air being pushed through on any corner any more, but there is fluid moving on all four corners (though probably more on the back than the front). And the pedal never pumps up better than a quarter or so even with all nipples closed. We have installed rebuilt calipers, new pads, new flex lines, and a new master cylinder (in fact, we tried a second new master cylinder on the theory that the first may have been faulty). As far as I can tell there is no clog in the fixed lines (we checked the front especially). Any suggestions? Thanks! |
76-914 |
Mar 22 2015, 10:54 AM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Did you bench bleed the MC?
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florida 914 |
Mar 22 2015, 12:00 PM
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#3
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Newbie Group: Members Posts: 29 Joined: 29-September 10 From: Salem, OR Member No.: 12,227 Region Association: Pacific Northwest |
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Johny Blackstain |
Mar 22 2015, 12:44 PM
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#4
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Walnut Elite Stratocaster player Group: Members Posts: 3,434 Joined: 5-December 06 From: The Shenandoah River Member No.: 7,318 Region Association: MidAtlantic Region |
Did you bench bleed the MC? No. I don't even know what that means. It means filling the MC w/ fluid & capping it before you install it. One of the possibilities available to you. Same applies to the proportioning valve in the rear. However, you can address these while the items are installed. With your assistant there, crack the lines on the MC while he remains up top & makes sure the reservoir does not go dry as you let the MC drip a bit. You should do the same for the proportioning valve in the rear although it's not as easy to do as the MC; your assistant might have to run between the pedal inside & the reservoir up front, making sure it never goes dry. Check the bushings & return spring on the pedal assembly as someone previously posted. Lastly, have you used a .004 feeler/gap gauge to adjust your rear calipers to the proper gap yet? You can also try tapping things w/ a screwdriver handle as you bleed to get the air bubbles to flow/move out. (IMG:style_emoticons/default/driving.gif) |
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