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Discussion summary
YOUR RESEARCHBrake lines leaking fluid with calipers off
Leading reported evidence
Use block of wood between the seat and pedal
Suggestion or failed attempt
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1
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Suggestion
Use a block of wood between the seat and pedal to hold the brake pedal down a couple of inches.
Leading evidence: 'Use block of wood between the seat and pedal' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use block of wood between the seat and pedal' (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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10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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2002 996 with PSM...I'm currently stripping, painting, rebuilding my calipers and adding stainless steel lines. Upon removing the calipers, the brake lines were consistently dripping fluid. I plugged them with some M10-1.0 bolts wrapped in teflon tape for the time being.
Is this normal, or is my master cylinder cap not sealing properly? Thanks.
Use a block of wood between the seat and pedal to hold the brake pedal down a couple of inches. That will move the MC fluid feed hole enough to seal the circuit so it won't drain the MC reservoir.
Since the system is sealed, my thinking was if air is not entering the Master Cylinder to displace the fluid, there should be no leaks at the lines. Just like if you cover the top of a drinking straw, you can pull the liquid out of a glass without it leaking out the straw bottom. Or is my master cylinder cap not providing an air tight seal?
Your reservoir is vented so that the fluid can flow to the master cylinder .
When you press on the brakes the MC spool moves forward covering the fluid feed hole(s) to allow pressurization of the fluid to the calipers.
If your cap was truly airtight when your brake fluid heated up and expanded the brakes would pressurize themselves.
As the pads wear the fluid is pumped in to the larger void behind the pistons. Eventually that would create a vacuum in the reservoir and stop flow from the reservoir to the MC.
If you don't seal the vent tube on the reservoir when you pressure bleed the brakes you will have a large puddle on the floor.
Your cap shouldn't provide an airtight seal.
