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· Registered
2 Posts
Discussion Starter · #1 ·
Car's brakes have been very effective but pad and disc wear was excessive so I have replaced all round and the car has now passed its first MOT - good! Having changed brake parts I have been using them gently and occasionally more than that to bed them in and have noticed things I wasn't previously aware of:

Brake pedal sinking with engine running, at the traffic lights for example. Sink is slight and seems to be a feature of many auto TD's of many makes. Saab issued a bulletin about this (522-2732) discussed on this forum -

ore interesting perhaps is that if I brake gently nearly to a stop and then rapidly pump the brakes to come to a halt, brake pedal becomes hard as if I have beaten the servo and vacuum pump's ability to support the brakes! Any normal braking is fine, ABS works and I can stop very rapidly.

Can any one else repeat this characteristic? Is it normal to be able to "beat" the car's ability to create vacuum? I would be interested to hear if this is within the normal scope of the braking system.

· Premium Member
3,799 Posts
big heavy autos eat braker disks and pads due to little or no engine breaking effect. most cars i have driven have had the brake pedal 'sink' a tiny bit when you rest your foot on it, as long as it 'pumps up' when you press it a few rtimes all is well.

sometimes when braking down from reasonably high speeds the pedal gets a little wooden, i will upgrade the pads when they wear out.
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