[s-cars] Brake lights on

[Fred Munro]

Hi Harold;

You firmly apply the brakes each time. A good UrS bomb will give you over 40
applications. The pedal gets noticeably high and hard when the bomb is
discharged.

The usual cause for the lit brake light on the UrS is low hydraulic pressure
in the boost system due to a leaky check valve in the bomb allowing fluid to
bleed off into the reservoir as the car sits. Flushing the hydraulic fluid
sometimes fixes the problem. It usually takes 20 - 30 seconds for the light
to go out after you start the car.

The ABS sensors are difficult to remove and easy to replace (after you have
cleaned them up). Check the connectors at the sensors and the ABS computer
first.

HTH

Fred Munro
'94 S4
'97 S6


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Harold McComas
Sent: May 12, 2006 1:02 PM
To: s-car-list at audifans.com
Subject: [s-cars] Brake lights on


Red and yellow oh my. Yesterday I started my car and the ABS off and Brake
light were lit. This was on the drive home last night. Parked in the
driveway and shut the car off and then restarted it and the lights were off.
Today did a quick once over and the hydraulic fluid, brake fluid levels are
fine. Bomb checks out OK ( I think?).

When you do the bomb check, do you merely apply the brakes the 25-35 times
or try pressing the pedal all the way down each time? I just applied the
brakes and stopped at 40 X. Is it supposed to get significantly harder or
maybe I cannot feel it with my lead feet.

ABS sensors need to be checked? How hard are they to pull and press back
into place.

Any and all tips appreciated.

Harold M
Manchester, NH
96 S6


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