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Old 07-30-2017, 12:42 PM
Registered User
Join Date: Jul 2017
Posts: 1
1989 300E brake issue


Encountered a problem with the ol 300E awhile back, brake pedal would come and go as it sees fit, would come back with pumping.


Master Cyl <--- New
ABS Pump <--- Used take off
Rear Brake Lines

Have bled the system key on engine off with a power bleeder, no air in the lines but car will only stop on the front braking circuit.

ABS light never came on with the original pump while the engine was running, comes on with the replacement pump.

Short of rebuilding the calipers I am at a loss, any help would go a long way.

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Old 07-30-2017, 08:00 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,574
Originally Posted by JasonDTM View Post
ABS Pump <--- Used take off
Does this mean you sourced the ABS at a pick-n-pull?
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 07-31-2017, 07:49 AM
Hirnbeiss's Avatar
ich fahre, also bin ich
Join Date: Mar 2002
Location: South Florida
Posts: 1,660
If the MC is definitely working on both circuits (usu. verified with a bench bleed upon installation), then I would go ahead and replace/rebuild the rear calipers. 29 in car years is 145 in human years.
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Old 07-31-2017, 10:10 AM
optimusprime's Avatar
Trevor Hadlington
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,295
Brake booster shot ..Sit in the car no engine running push the brake pedal till its on the floor and hold it down .Now start the engine and hold your foot on the pedal it should lift your foot up if the booster is working .If it wont bring it up to normal level replace brake booster Or you have a vewry bad vacuum leak .

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