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Brake pedal gets low on long commute. 200

posted by  Grey240Polar on  Thu Feb 9 10:42 CST 2017
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Without the vacuum servo, yep, more brake pedal travel with more foot force required if the hydraulics are good. (No leaks, no air in the lines, and so forth.)

But why then, if you remove the vacuum in the servo by pressing and releasing the brake pedal with the engine off a couple of times, does the brake pedal become hard and get a shorter travel?
If you then press the pedal, hold it down and start the engine, the new vacuum makes it go further down and the travel becomes longer again when you subsequently press and release the pedal.

What I mean is shown in this vid, it's also what my 245 does.

This has me wondering if a faulty brake servo could also over assist...






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