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Registered User
Join Date: Jan 2005
Location: Miami Florida
Posts: 4
2000 Boxster Disappearing Brake Fluid?

Good day,

I have a 2000 Boxster that the brake fluid continues to disappear. There is no leak / puddle under the car, however, do notice that every now and then the brake pedal has to be pressed deeper to get the brakes to engage.

Can the brake fluid be filling up in the disk looking part that hooks up with the master cylinder? Is the area were the brake fluid reservoir a sealed compartment were the fluid is leaking and being contained?

Advanced thanks in the matter.
Old 08-22-2018, 07:31 AM
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Registered User
Join Date: Jul 2012
Posts: 61
The disc looking thing is the vacuum booster and the most probable place the fluid is going if not outside. There is a vacuum line on the left (facing it). Take that off and put a pipe cleaner or something you can see fluid on down to the bottom of the booster to see if the fluid is there.
Old 08-22-2018, 02:44 PM
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unindicted co-conspirator
looneybin's Avatar
Join Date: Jul 2007
Location: Fresno, CA
Posts: 1,550
Check under the carpet
The master cylinder may be leaking, and they tend to leak inside the firewall
'03 996 - sport exhaust, sport seats, M030 sport suspension, stability control
'86 944 - Wilks PP2, strut brace, harness bar, M030 sway bars, 200# springs, koni adj, throttle cam, K&N filters, momo wheel & shift knob - faster in the twisties than a mustang
Old 08-22-2018, 05:23 PM
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