The correct way to do this brake servo test is to first evacuate the vacuum
chamber by pressing on the pedal 6 or 7 times, without the engine running.
You should hear a slight hissing noise when you press the pedal as the
chamber evacuates. Keep pressing until there is no more hissing. Finish
the last press with a longer (5 or 6 seconds) hard press to see if the pedal
goes down. It shouldn't, it should remain solid. Whilst your foot is still
on the pedal start the engine and as the vacuum builds up the pedal should
go down slightly underfoot. This should happen more or less straight away
and you may even feel the pedal moving before the engine actually fires up.
After the engine has started and the pedal has gone down slightly, lift your
foot off the pedal for 3 or 4 seconds and the next time you press it it
should be at its normal braking level. Press the pedal hard enough to bend
the steering wheel ( ! ! ) and the pedal should sink to its maximum braking
position and stay there. Keep pressed for 8 to 10 seconds, your foot /
pedal should not sink any further.
If all of those conditions are met the servo has passed the UK DOT annual
test.
Guy R Day
----- Original Message -----
From: "Gaagten" <gaagten@hetnet.nl>
To: <healeys@autox.team.net>
Sent: Tuesday, July 21, 2009 7:19 PM
Subject: [Healeys] Brake servo
Dear list,
Thanks for all the good ideas about my problem. Most of the people went for
the solution of changing the flexible break lines.
I ordered these items today, I will keep you informed.
Second option was the servo unit. Also a test was recommended which I did,
putting my foot on the brake pedal and start the engine.
I did not notice any change in the feeling of the pedal? (It should go down
for an inch).
Regards,
Ge Aagten
BJ8 1964
THe Netherlands
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