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Old 05-23-2011, 08:25 AM   #1 (permalink)
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Date registered: Sep 2009
Vehicle: '91 Merc 190E 2.3
Location: London, ON Canada
Posts: 222
Question Wheel Makes Noise -- Bleed Brakes OR Caliper?

I own a 1991 Mercedes 190e 2.3 (automatic, 4dr) here in Canada. While driving or while applying the brakes I can here a scrubbing / knocking noise coming from the right-rear wheel. On first driving there is nothing but once i hit greater than 60 kph the noise can be heard and remains on while driving, though quieter when driving slower, and gets louder while applying the brakes. There are no other symptoms to speak of -- brake pedal is fine, brake fluid is topped up, checked all pads and caliper.

Someone suggested two things:

1. Bleeding the brakes

2. Replacing the caliper

For my vehicle how exactly do i go about bleeding the rear-right brake?

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Old 05-23-2011, 09:31 AM   #2 (permalink)
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The first thing I would suggest is tearing into it a bit to make sure something isn't worn out or missing, maybe a pin is dislodged, perhaps the dust seal has cracked and the piston/bore is corroded and sticking, etc.

After all if you have to replace the caliper you'll bleed it then.

Good luck.
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Old 05-24-2011, 09:04 PM   #3 (permalink)
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Date registered: Sep 2009
Vehicle: '91 Merc 190E 2.3
Location: London, ON Canada
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It is tough for me to identify what is causing the scrubbing / thumping unless the wheel is in fast motion.

How safe is it for me to have the car on jack stands (both rear wheels), have the car in drive, then step on the gas + apply brakes in order to hear - locate the issue with the rear right wheel?
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Old 05-24-2011, 09:14 PM   #4 (permalink)
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Date registered: Nov 2009
Vehicle: 1984 190D 2.2 ; 1984 190E 2.3
Location: Morgantown, WV / Silver Spring, MD
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Do you have anti squeal stuff on the back of the pad?

How to bleed the brakes:
-Run a hose from the bleeder valve to a plastic water bottle partially filled with brake fluid
-Have one person slowly push in and let out the pedal while another is keeping the reservoir filled
-When they are pushing down, you open the bleeder valve to let the fluid come out.
-When they begin letting go of the pedal, close the bleeder valve so no air or old fluid goes back in.

Keep bleeding until you see no air bubbles, and the fluid is clear.
If you haven't replaced the fluid in awhile, do this for all four calipers.

1984 Mercedes 190D 2.2 Auto - 140,628 miles ("Restoration" project)
1989 Oldsmobile Cutlass Calais S - 105,000 miles (DD)
1991 Dodge Stealth R/T - 96,000 miles (Weekend car)
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