While sitting at a light, car will lurch forward a hair, as though I had taken my foot off the brake, even though I am holding the pedal down firmly. The pedal may pulse faintly, but does not sink. Idle steady at 700rpm, but it seems to briefly dip a hair when this occurs. This occurs up to several times a minute. My thought is a problem with the ABS, which I don't believe should be active at rest. The ABS light is off. Any ideas?

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

If you have your foot firmly on the pedal and the car still creeps forward, I would guess the master brake cylinder or you may have a small leak somewhere in the system.

Start off checking pad thinkness, calipers, hoses and lines......

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Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

Could there be a connection to a problem with vacuum and the brake booster?

I don't think there is a leak or seal failure, because the pedal does not go down when it happens. It feels as though the brakes release very briefly, then re-engage - i.e. as you might expect in a panic stop with ABS engaged.

I also don't think it is vacuum-related, because I would expect vacuum to be fairly high at closed throttle. Also, if it were vacuum related, I can't see how it would pulse in and out as it does.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7