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Re: Atypical BOM Failure Mode?
Sounds like your master cylinder may be failing. A bomb failure results
in a hard pedal and the feeling that the rotors are greased!
You can test your bomb by running the engine to charge the system,
shutting the engine off, and pumping the brake pedal until it gets hard. You
should get at least 10 applications. A new bomb will give 30+ before running
out of pressurized fluid.
'91 200q 277k km
----- Original Message -----
From: woodland <email@example.com>
Sent: Tuesday, July 20, 1999 9:07 PM
Subject: Atypical BOM Failure Mode?
> My '87 5KTQ has developed a new symptom..
> Brake pressure/action/pedal feel are all normal at startup, but after 30
> min. driving, pedal gets soft and braking is drastically diminished. Feels
> like the rotors are greased.
> Multiple pumps give a brake warning light at this point, but not at
> startup. If it were the BOM, I would expect a hard pedal in the morning,
> with things returning to normal as the pump builds pressure.
> Any help/BTDT type experience would be appreciated.
> Best regards,
> Mark Woodland