Sticking Brakes - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 12-19-2006, 04:27 PM Thread Starter
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Question Sticking Brakes

I have taken the plunge and purchased a 1969 250 / 8 W114.010 Car is solid but will need a bit of work to get it back to a daily driver. Got it started this past weekend and on a short ride I noted that the brakes are holding. Pedal is OK - does stop the car but pulls hard to the right. In neutral I can't even roll the vehicle without alot of effort.
Any suggestions on how to attack first. The car was sitting in previous owners residence for a couple of years without moving. Should I spray everything down with wd40?
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post #2 of 6 (permalink) Old 12-19-2006, 06:12 PM
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You probably have at least one bad brake caliper. You may be able to free it up and reseal it with a rebuild kit, but a replacement is probably in order. Welcome to BenzWorld, BTW, and congrats on your new-to-you ride!

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post #3 of 6 (permalink) Old 12-19-2006, 08:39 PM
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I suggest you replace the brake hoses first. You may also want to replace the master cylinder as well and inspect the calipers for torn rubber boots. Check the brake discs for scoring or excessive wear. Actually, just replace all the components. You will need flare tool wrenches available at Sears and other suppliers.

The car is old and your life depends on the brakes.

Don't use WD40.

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Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant
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post #4 of 6 (permalink) Old 12-20-2006, 07:04 AM
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I'd replace the hoses first starting with the problem wheel. They are cheap and they do occlude.
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post #5 of 6 (permalink) Old 12-23-2006, 04:24 PM Thread Starter
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Angry Sticky Brakes

OK - I split the caliper and after some fluid came out the brake released. Wheel now spins freely. Thats the good news.
The bad news it that the caliper stays put released now. I guess the line is the issue.. but it doesn't appear to have any obvious obstructions or look collapsed.
I tried to open the bleeder and no fluid... rest of the brakes stayed fine.. good pedal. Time to order lines?
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post #6 of 6 (permalink) Old 12-23-2006, 04:58 PM
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The hoses wont look collapsed because thats not what occurs. Over years pieces of the rubber hoses flake off internally and restrict fluid flow. The contamination acts like a one way check valve, allows fluid to flow to push the piston, but will not allow fluid to flow back to the master. I do not recommend splitting apart a caliper unless its to be rebuilt.
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