C8 Brake Flush - System Pressure Release

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Oct 7, 2025 | 08:09 PM

Ryan-TN

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3rd Gear

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C8 Brake Flush - System Pressure Release

Using a pressure bleeder on the C8 for the first time. Worked well but around 14-15 psi it seems that the master cylinder has a pressure release valve that will not allow it to go over 14 psi. Did anyone else experience this when using the pressure bleeder? Is this normal? Note, battery was disconnected.

Oct 9, 2025 | 08:53 AM

A10Beav

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From: Republic of Texas

I haven’t seen this and I use a pressure bleeder. You’re probably losing pressure with a leaking seal. Many have reported problems with that.

Oct 10, 2025 | 01:26 AM

X25

Sr.Random input generator

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From: Sammamish, WA

... and it might be just leaking from the cap adaptor that never seats perfect on Motive bleeder. Besides, 14 PSI is plenty : )

Oct 10, 2025 | 05:02 PM

Mitchell_B

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Quote:

Originally Posted by Ryan-TN

Does your pressure bleeder have a built in pressure relief?

Oct 13, 2025 | 10:44 PM

Ryan-TN

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3rd Gear

Joined: Oct 2025

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Quote:

Originally Posted by X25

... and it might be just leaking from the cap adaptor that never seats perfect on Motive bleeder. Besides, 14 PSI is plenty : )

That’s exactly what it ended up being. It would bleed off about 1-2 psi and then reseal. Thanks for the response

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