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Thread: X-Country SLS brake problems

  1. #1
    Join Date
    May 2012
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    X-Country SLS brake problems

    Hey ALL,

    I recently drove my 1998 SLS 6,200 miles on a cross-country journey. About 1,000 miles in, the brake pedal hit the floor -- not in a busted line way, but in a master cylinder died kind of way. Slowly would depress to the floor every time you broke, but would stop the car. You could pump them, but at a stop sign you could get it all the way to the floor. I didn't have the right tools to do the job, so I had a shop install a new master. It worked great for another couple thousand miles, and then did the same. I took all the tires off and did a full bleed. Worked, but again, a few thousand miles, and they went to the floor. I drove them that way from Los Angeles to Seattle. Bled them a few times, but it would only last a few hundred miles. Oddly, sometimes they work great, and sometimes they don't. Do you think the new master was improperly bench bled -- its a reman. Should I get a new one, do the whole job over myself, or may I possibly be looking at an ABS problem? I don't think it's mildly connected, but I was also rocking the c1281,c1283,1287,1288 codes and had to replace the steering sensor along the way.


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Woodstock Ill.
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    Re: X-Country SLS brake problems

    Your symptoms sound exactly like a bad master cylinder. Considering that it was a reman, I'd replace it.

  4. #3
    Join Date
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    Re: X-Country SLS brake problems

    Thanks Ranger,

    I was coming to the same conclusion. The reman also used the factory reservoir. Is that a general problem spot, or is using the old res okay? Somehow, at NAPA, the one with the new reservoir is so much more expensive. My only other question is, I've read that some people bleed the ABS unit while they bleed the brake system...is that a necessary step? I've bled many brake systems, but I've never had to bleed an ABS unit before.

    Thanks!

    Pete

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,278

    Re: X-Country SLS brake problems

    The reservoir is not the problem. You should have no problem keeping your old one. The problem is the piston seal. Fluid is leaking past the piston, thus the brake pedal sinks.

    I have yet to bleed the ABS unit (EBTCM).


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