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Old 04-01-2004, 10:48 PM
Meza's Avatar
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Brake experts..Some help needed on my 190e brakes

The car is a 93 2.6L 190E.
I have done over 50 brake jobs on many cars. My wife drives the car and I hardly drive it. Until I drove it to Charleston, SC over a weekend and the damn thing would not stop like it should and make a sound as if the pads are almost down to the metal. I got home and ordered new Balo disks and OEM MB pads front and back. The next weeked I changed all the disks and pads and flushed the fluid with new DOT4. The old front pads had a bout 1 cm left and the rear are as good as new. I took the car for a test drive to seat the pads and it just doesn't feel right. It stops good, however, I feel like there is a delay before they respond and the pedal travels more. I called a friend and re-bled the brake lines again. No improvement. I think now that I need a master cylinder, but it's not leaking externally. All calipers move freely and pulling. Is the ABS has anything to do with this low pedal/delay brake feel or is it the master cylinder. It's about $200 and don't really want to replace it if not need. I just want to know if there's anything I am missing before replacing it!
Any help would be appreciated..
Meza

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1993 190E 2.6
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Old 04-02-2004, 03:39 AM
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unlikely that it's the ABS.

your first thought (master cylinder) is probably the culprit, though i would not neccessarily rule out the booster as well.
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Old 04-02-2004, 07:50 AM
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I have a friend that has the same car and he found that the bleed ports on the rear calipers are at the top which makes them hell to get all of the air out. Take a look at the rear calipers. Are the bleed points "up"? You will need to come up with some type of "power" bleeder and force the fluid from the caliper to the master cylinder.
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Old 04-02-2004, 07:54 PM
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Well, I never had any of the brake lines open. I just removed the old fluid from brake reserevoir and filled it with fresh DOT4 and bled all four calipers. fluid came out nice and no air that I can see. I am leaning towards the MC but I may take it to a shop to pressure bleed it. I do have a brake bleeder by MOTIVE the kind that attach to the MC reservoir and uses a built-in pump with a gage. I don't like it and I think it's a POS. I douby if the booster is bad. They leak if they go bad and I don't have a leak not to mention the amount of pedal force you'll need to stop the car.
Meza
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Old 04-02-2004, 09:08 PM
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The ABS brakes on the 80's Benz do feel a bit strange at first -- sorta like Chyrsler power steering in the 60's. You get more braking power by moving the pedal down, but it doesn't feel as if you are pushing harder. Pedal has more travel that a non ABS system, too.

The brakes on both the 300D and the TE feel mushy compared to the brakes on the 280 or the Volvo, but work perfectly.

If the pedal sinks under light pressure or firms up at differenct heights at different times, I'd swap the master cylinder -- cheap compared to loosing the brakes.

Booster being bad will only cause hard pedal.

Peter

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