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YOUR RESEARCHbench bleeding master cylinder ?
Leading reported evidence
Disconnect from the hydraulic lines
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Suggestion
The device would have to be disconnected from the hydraulic lines which no matter how thoroughly you bleed the thing on the bench almost certainly you are guaranteed some air will be reintroduced when the cylinder is reinstalled and reconnected to its hydraulic lines.
Leading evidence: 'Disconnect from the hydraulic lines' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect from the hydraulic lines' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Use either a pressure bleeder or the other technique
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No successful repair reported for this finding.
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Suggestion
Every car either used on the street or the track has its braking system successfully bled while the master cylinder remains in the car using either a pressure bleeder or the other technique.
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Disconnect from the hydraulic lines
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
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Suggestion
The device would have to be disconnected from the hydraulic lines which no matter how thoroughly you bleed the thing on the bench almost certainly you are guaranteed some air will be reintroduced when the cylinder is reinstalled and reconnected to its hydraulic lines.
Use either a pressure bleeder or the other technique
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Every car either used on the street or the track has its braking system successfully bled while the master cylinder remains in the car using either a pressure bleeder or the other technique.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
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I have had 2 brake fluid flush and last one by a professional and I still have mushy pedals from time to time, not as bad as before the pro-flush but still.
I was wondering if anyone had done a 'bench bleeding' of the master cylinder ?
You Tube
My fluid is not boiling when I am coming back form hot laps, but the pedals doesn't feel progressive at all. it goes from a level of 0 to 5 with progressive grip, then it get mush and jump to 15, then it is progressive.
So right now I am braking really early because I really don't have a good feel on the brakes.
On the street, the feel is perfectly progressive.
I have PFC brake pads all around with stock rotors (27k street miles on them).
Can't imagine how the master cylinder could be bench bled. The device would have to be disconnected from the hydraulic lines which no matter how thoroughly you bleed the thing on the bench almost certainly you are guaranteed some air will be reintroduced when the cylinder is reinstalled and reconnected to its hydraulic lines.
Every car either used on the street or the track has its braking system successfully bled while the master cylinder remains in the car using either a pressure bleeder or the other technique.
Are all the underbody plastic panels/ducting present? If these are missing the brakes may not be receiving their proper allotment of cooling air and the brakes may simply be running hot.
Added: I watched a bit of the video. While it can be done it seems so unnecessary unless perhaps the master cylinder was new and replacing a bad one and bench bleeding gave the mechanic a bit more ability to work the cylinder around to remove those hard to remove air bubbles from the cylinder. But it you want to bench bleed your car's master cylinder...? Who knows? It may be just what the doctor ordered.
Sincerely,
Macster.
I indeed never heard of such thing on rennlist but as I was making a search I saw a couple miata or vette forum talking about it. I'll bleed the system again, this time trying to activate the abs pump with the durametric to get all the old fluid out, we'll see
Just out of curiosity, what kind of brake fluid are you using? How sure are you that you are not boiling it? It's not something you would see, only feel.
