Quote:
Originally Posted by Schurkey
You didn't split the master from the ABS unit? I bet the ABS has heaps of air trapped inside.
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Now that you made me think about it, I should have bled the master cylinder before I reattached it to the ABS unit. That's probably the reason the master cylinder only came with 2 plastic hoses.
It would have been easier to bleed the master cylinder by itself. It's hard to get a grip with the vice on the combined mc/ABS because the ABS is in the way.
It's already on the van now. I'm going to try to bleed via the wheel zerk fittings.
Quote:
Originally Posted by Schurkey
A pressure-bleeder that doesn't separate the brake fluid from the air the pressurizes it with a rubber diaphragm, is SPECIFICALLY NOT RECOMMENDED by GM.
The brake fluid will absorb humidity out of the pressurizing air. The fluid is already contaminated as soon as it's installed.
I gave-up vacuum bleeding decades ago, ESPECIALLY on drum brakes. You have to seal the bleeder-screw threads or you pull air into the wheel cylinder or caliper, and particularly with drum brakes, you can pull air past the seals on the piston. In that case, you'll never know when to stop bleeding because there will always be air bubbles.
You are almost certainly going to need a proper scan tool to bleed the ABS unit.
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Can I do that later? If the van bleeds OK, will the brakes function without the ABS unit being properly bled? I don't have access to a scan tool now and can't buy one either.
I'm planning to bleed at the 2 zerk fittings on the front of the ABS before I bleed at the wheels. I already bled at those points when I had the unit in a vice, but doing it again couldn't hurt.
(Added Edit) Wow! Although it's only 95° F out there, I couldn't last more than 15 minutes. I had to close up and go back in. I pity all the people in the world who endure this temp (and worse) without air conditioning. When you begin to get old, as I am doing at 69, you wonder if any physical shortcoming is because of age. Maybe I could take the heat if I were 10 years younger.