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This topic contains 9 replies, has 5 voices, and also was critical updated by Kevin Criswell 8 year ago.

You are watching: Bad master cylinder or air in lines


Its me
Salvador Alasco

I made absolutely sure that there were no bubbles in the two tubes ~ bench-bleeding the MC and that the piston was very firm. Mine helper and I pumped the brake pedal ten times per repetition because that each wheel however the moment I relax the bleeder valve screw, over there were just insignificant trickles of fluid coming out of the orifice. The automobile is a 2006, 3.9L, V6 chevy monte carlo with all wheel ABS.


college man

If girlfriend bench bled the master and still acquire nothing or smallamounts that fluid. Get one more master cylinder. Is this a remanor new?


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It’s a new one.

Try to gravity bleed. Open the bleeder and also see if liquid willcome out. If not brand-new master. If you cracked the heat at the mastersee if fluid shoots out as soon as pedal is pressed. Or crackthe heat at the caliper and also press the brake pedal to see iffluid comes out.Try remove the bleed screw.you might havejunk prevent the port.


Did you follow the indict on the little record sheet that come in the box? Of course not. Hardly anybody does. We’re simply so excited to acquire this shiny new thing into place us don’t even SEE the sheet. Or we think it’s just going to it is in pages and pages of evident cautions favor “Don’t stick your tongue into the slicer.”

You need to “bench bleed” the understand cylinder. Lock don’t tell friend why. The Why is that many master cylinders finish up placed at a slim angle, and also since waiting bubbles climb to the greatest point, you often can’t bleed out all the air when the grasp cylinder is mounted. If you’ve already mounted it, you can “bench bleed” it in place by jacking up the front or behind of the vehicle until the master cylinder is level.

The problem might additionally be the you have a lot of air in the lines, i beg your pardon will take place if you let a brake heat sit unhooked because that a while and the whole line bled out. The only cure for this is to get the huge oversize bottle of brake fluid and also TWO helpers, one to save the understand cylinder reservoir filled up, anther to push the brake pedal, and also you at the bleed valve, tightening, speak “push”, opened it slightly, the town hall the clear pipe for fluid and bubbles, then tightening it, and saying “UP” over and over, at each wheel in sequence until girlfriend consistently gain solid fluid and also the person at the pedal reports a certain pedal.

Do no use one of those “one person” brake bleeding devices, the ones v a check-valve. Castle don’t work really well, quite regularly air bubbles will sneak earlier in v the bled screw threads. Also after you shot to block that course by putting some goop top top the threads. Tried it, failed. You need the two friends.

There can also be tough to eliminate air bubbles in the ABS manifold, occasionally you need to loosen a brake heat at the manifold and put a shop rag around it and also bleed indigenous there.


What we have done:1) twice bled the master cylinder.2) heaviness bleed———->-trickles of liquid to virtually nothing3) Cracked the heat at the calipers———>same together (1) above4) Bled the wheels making use of a one-man bleeder pump.5) Bled the wheels using two-man method.6) Swapped calipers at the earlier just come be sure it is no the calipers at fault.

We have actually not do the efforts removing the bleed screw. However even if we did, is it feasible that all 4 ports room blocked, if at all ?

Prior to bench bleeding the MC because that a second time, i filled the brake liquid reservoir full, pushed on the piston, and fluid squirted native both ports of the MC.

How can air possibly get into the ABS manifold ? would I have actually inadvertently introduced air when I disconnected (and reconnected later on on) the 2 MC fittings from the 2 cylinder harbor ?

How do you bleed native the ABS manifold ?


First, see if your behind brake lines walk to a proportioning valve that’s operated by the behind suspension. If you’ve jacked up the rear end, the valve can end up completely closed and also you won’t obtain anything out the rear bleed valves. You need to use a bungee cord or something to hold the valve open. Even the dealer mechanics at the VW dealer don’t recognize this.

Next, throw away the one-person bleed thingy, it’s useless, for two reasons.

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You need the friend, a great friend the is willing to sit with the tedious cycle of “UP”, DOWN, call me once the pedal is virtually all the way down, okay, currently up. Recurring 20 to 30 times. The occasionally mentioned an approach of pump the brake pedal 10 time vigorously, ns don’t see exactly how that deserve to do something good. Occasionally slow and also easy is the bet way.