Gents,
this sounds like to me that you have a failed seal within the master cylinder.
brake master cylinders generally have double seals...if the main fails it will bypass the fluid back into the master cylinder, whereas a brake master cylinder generally has only 1 seal; when this fails the brake MC will leak into the cabin.
I would be willing to bet that it's the master cylinder seals...If you speak to Big Redd Racing (Google it) they'll be able to supply you with a seal kit for about £20.
the other thing i would check is to make sure the vacuum line to the booster hasn't been put on the wrong way round as there's a 1-way valve in there to stop engine vacuum dicking with the brake pressure.
Congratulations to vtecmec for winning May/June's Lude Of The Month, with his DIY Turbo BB1 build.
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Seriously Scary brakes - Please help.
- vanzep
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As on page 1vanzep wrote:Rebleed them and if that doesnt work then have a read of this link about master cylinder
http://www.tegger.com/hondafaq/mastercy ... index.html

1996-2000 1993 EG9 Blue Civic 1.6 Vti - Traded in against the BB4
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD
2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
2021 ON > 1998 2WS BB6 White Pearl JDM Prelude Si VTEC
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD
2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
2021 ON > 1998 2WS BB6 White Pearl JDM Prelude Si VTEC