Does your car have ABS (antilock braking)? My '88 does 560SL and I think your '86 does too. The ABS pump in these cars, when it cycles, will make the brake peddle pulse and make a noise so that may be the problem you describe. You may have a faulty wheel sensor or ABS controller causing the ABS pump to activate when it shouldn't.
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Marty D.
2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz
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