No brake pressure

No brake pressure

Postby Mberry0614 [OP] » March 26th 2021, 12:24am

03 Astro AWD - 197xxx
No brakes, when you step on the brake pedal, it goes straight to the floor. I started by changing the master cylinder. Replaced with a junkyard part. Still no brakes. Then I replaced both rear pads & calipers, and bled the system. Alot of air came from the RF. Brakes started working again after that, now all of a sudden, I lose brake pressure again, pedal straight to the floor. It has not been losing any fluid since I replaced the master cylinder. Is it possible that the junkyard master cylinder I got was no good? Or could it be something else? Idk what else to do, other then bleed the system again and see if that helps. Thanks for the input.
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Re: No brake pressure

Postby tungtide » March 26th 2021, 1:12am

I vote bleed some more
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Re: No brake pressure

Postby Mmusicman » March 26th 2021, 1:21am

You must be certain brake lines are fully bled with no air in them.
If you change the master cylinder, then you likely pushed air down the line, and it may even be in the ABS unit, which also requires bleeding. Does brake pedal go to the floor when engine is off?
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Re: No brake pressure

Postby Mberry0614 [OP] » March 30th 2021, 12:22am

The brake pedal is actually somewhat stiff when the van is off. Like it should normally feel. I bled the entire system again, and I got alot of air from the right front. Brake pressure came back. It lasted about a day or two, then I lost pressure again. I bled the system for a third time, and same issue again, alot of air from the right front. This time I couldn't get the air to clear out. I'm thinking brake hose?
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Re: No brake pressure

Postby AstroWill » April 1st 2021, 8:52pm

If you are repeatedly getting air from the right front, there is air leaking in somewhere. Line/hose/fitting/etc

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Re: No brake pressure

Postby keith92ext » April 18th 2021, 10:19pm

first i would buy a new master cylinder just for piece of mind and then keep bleeding...took me 3 times around when i replaced my hard lines ...
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