C8 Z51 Brake Bleed Disaster!
Melting Slicks
Joined: Aug 2020
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Last edited by ZRacerLE; Oct 10, 2023 at 08:52 PM.
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Joined: Feb 2021
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In general vacuum is bad. This goes back to drum brakes which had lip seals (cups) in the wheel cylinders. The lip seals will only seal in one direction. The system is designed to be under pressure not vacuum. 5psi should be adequate to pressure bleed with an open-air bleeder. The commercial units have a bladder that separates the pressurized air from the fluid and may require a higher pressure.
Melting Slicks
Joined: Nov 2007
Posts: 2,282
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From: Pittsburgh PA
St. Jude Donor '10-'11-'12-'13-'14
Thread Starter
Melting Slicks
Joined: May 2021
Posts: 2,562
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Can someone confirm that the side of their brake fluid reservoir has NO indentations on the driver side like the ones in my picture above?
I was at the dealer yesterday and they were were pretty dismissive and basically accused me of making those indentation / punctures to the side of the reservoir. ("Did YOU try to use a universal cap on it????")
Not at all lady, and I showed them the cap that I tried to use with the motive system that wouldn't seal, showed them the damage to the filler neck of the reservoir. Neither of the caps I used could produce either of the areas that are damaged on my car.
I was at the dealer yesterday and they were were pretty dismissive and basically accused me of making those indentation / punctures to the side of the reservoir. ("Did YOU try to use a universal cap on it????")
Not at all lady, and I showed them the cap that I tried to use with the motive system that wouldn't seal, showed them the damage to the filler neck of the reservoir. Neither of the caps I used could produce either of the areas that are damaged on my car.
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Joined: Sep 2023
Posts: 85
Likes: 5
In general vacuum is bad. This goes back to drum brakes which had lip seals (cups) in the wheel cylinders. The lip seals will only seal in one direction. The system is designed to be under pressure not vacuum. 5psi should be adequate to pressure bleed with an open-air bleeder. The commercial units have a bladder that separates the pressurized air from the fluid and may require a higher pressure.
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