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Old 04-14-2014, 09:07 PM   #1
Tee2 OP
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Astro Van master cylinder bleeding?

I have a 2000 Astro van that had about 100 mile in the last 3 years. I had brake problems and figured out with the help of a friend the master cylinder was bad. I got a new one and installed it but can't get it to bleed. If I let it sit for a few minutes it will pump good two maybe three strokes then air.

Anyone know what I doing wrong?
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Old Yesterday, 04:18 AM   #2
trailer Rails
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Did you bench bleed before installing? I am guessing you did not, since you did not mention it. Pull the master cyl and bench bleed.
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Old Yesterday, 04:59 AM   #3
H96669
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Don't push the pedal all the way down i.e. the piston all the way to the end of its travel when you bleed. That may damage it. A friend of mine found that out the hard way.

The old "approved" procedure was to put a block of wood on the floor under the pedal to prevent that. Still valid.
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Old Yesterday, 08:04 AM   #4
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Quote:
Originally Posted by trailer Rails View Post
Did you bench bleed before installing? I am guessing you did not, since you did not mention it. Pull the master cyl and bench bleed.

I was thinking about how can you get all the air out at the angle the master cyl sits when installed.

Do you have to plug the ports after bleeding and while installing the master cylinder?
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Old Yesterday, 08:10 AM   #5
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Quote:
Originally Posted by Tee2 View Post
I was thinking about how can you get all the air out at the angle the master cyl sits when installed.

Do you have to plug the ports after bleeding and while installing the master cylinder?
Last times I bought GM "aftermarket" MCs they came with the little plastic hoses required for bench bleeding. And same as a Dodge one I bought.
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Old Today, 06:11 AM   #6
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+1 on bench bleeding. It can be fiddly.

Depending on the source of the part - they can be bad right out of the box.

I once had a hydraulic clutch master cylinder from a low-price parts store turn out to not have the bore properly final finished. It still had fairly deep hone marks. Bits of rubber floating in the reservoir from the piston rings being torn up was my clue to take it apart and look. (was a big waste of my time to buy it, install it, bleed it, then remove and disassemble it and take it back to the store)
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