Twitch through pedal under braking

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Doodle

MB Enthusiast
Joined
May 3, 2005
Messages
6,188
Location
Echo Beach
Car
R129, KTM 1290SAR, Superb 272 wagon
I've recently started to get a slight twitch back through the pedal on the 129, almost like a burp or hiccup from the hydraulic system. It's usually under light or moderate braking, but doesn't happen every time.

The brakes seem to work perfectly well, although I notice the braking force increases slightly when this happens. Air bubble trapped in the system? The fluid is due (if not overdue) a change.
 
Premature ABS activation?
 
Possibly, although it would only be firing for 1 or 2 cycles maximum, and it's very premature as it happens even under gentle pressure.
 
Try taking the car out and doing a two or three of hard braking sessions (60-20) in succession.
 
Amyotrophic Lateral Sclerosis?
 

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