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Originally Posted by qweasdzxc
Hello i was directed to repost this in here as i mistakenly put it in the wrong section before. I own a 1987 560SEL my problem is as an example if i get onto the highway and go 1-60 it will shift very smooth. Then release the gas the breaks will apply themselves (which i assume is by design? quite annoying rlly tho). So it will drop to like 45-50 when i go to give it gas again it will jerk the car quite aggressive im assuming its the transmission shifting into a new gear? Im just not sure if this is considered normal or if im breaking something by driving it around.
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Quote:
Originally Posted by Diseasel300
The brakes should never apply themselves. Are you sure you just aren't stuck in a low gear and the engine RPM is slowing the car down? If so, it's entirely possible that you get an abrupt shift when you hit the gas again. Check for vacuum leaks, barring that sounds like time to have the transmission checked out.
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Quote:
Originally Posted by Diseasel300
The ABS system on the W126 is just that.....Anti-Lock Brakes. If you hit the brakes hard enough to lock the wheels, it pulses the brakes to keep the wheels from locking and sending you into a skid.
Self-applying brakes on Mercedes didn't come around for over a decade after your car was built, and only to prevent a crash! The brakes should never apply themselves on a W126.
Since the jerking happens when you accelerate, let off the gas, then accelerate again, it sounds like you have a transmission sticking in a gear or stumbling during a gear change. If you're not technically inclined, it would be well worth having it checked by a reputable shop before you do any permanent damage to it.
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Actually, 126s with ASR do have self applying brakes; the symptoms described by the OP are consistent with either correct ASR operation with mismatched tire diameters, or, a fault in the ASR system with same diameter tires all around.
As a first step, the circumference of each tire (aka, "tire roll-out") should be measured and compared.