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wagon weird brake problem 700 1988

posted by  danlopresto on  Mon Jun 23 12:27 CST 2014
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last visit: Mon Jun 23 12:27 CST 2014
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Hi there - I just got this car, and it was sitting for a year or so. The problem I am having is that the right side front and rear brakes are dragging after I use them a few times. I thought it was only the front, and replaced the caliper. I noticed the pads were glazed but had plenty of pad. The next time I drove it, when I parked, there was smoke coming from the front and rear right side only wheels. The engine strains to reach 45MPH when the brakes are dragging, but when they release, it flies. If I leave it parked for an hour or so, they release fine.

The left side is fine.

I have checked the tubing/hoses, and they appear fine. I am assuming there is no diverter valve, as this car has Anti-Lock brakes. Before I go and replace that entire unit, I was wondering if I am missing something, or if a complete system bleed may help, or if there is something that I can do to the ALB unit itself.

Thank you.








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    wagon weird brake problem 700 1988

    posted by  oldyellr on  Mon Jun 23 14:56 CST 2014
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    last visit: Fri Oct 24 14:28 CST 2014
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    Could be rusty caliper bores and pistons seizing. Try pressing the pistons back a few times. I they free up, you should flush and change the brake fluid.
    --
    1992 745, >500k km








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    wagon weird brake problem 700 1988

    posted by  Amarin on  Mon Jun 23 13:24 CST 2014
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    last visit: Thu Oct 23 22:42 CST 2014
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    Hello,

    Old brake hose could form a restriction inside resulting in a one-way valve (even if it looks fine outside). This prevents brake fluid from returning quickly to the reservoir causing dragging brakes. If the rubber hoses are the original ones that comes with the car you may need to replace all.

    The fact that after letting the car sit for a while releases the brake points towards the above problem (the brake fluid slowly returns and releases the brake).

    Hope this helps,
    Amarin.







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      wagon weird brake problem 700 1988

      posted by  riverbend on  Mon Jun 23 18:38 CST 2014
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      last visit: Wed Oct 22 15:29 CST 2014
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      If you crack the bleeders on the left side and the problem goes away, that is a fair indication that pressure is being held in the left side calipers, typical of internally restricted hoses. I don't know if a bum ABS unit would act he same way.

      Greg






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