ok when i step on the brake pedal the revs go up a bit and my rear is really hard, like when going over bumps or pot holes. any ideas


190E 2.3 16v 1985 (euro)

I'd get your hard rear checked out. could be constipated.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

Check for vacuum leak.

so maybe my brake master cylinder is going bad?? or can it be something else, i think my shop tampered the master cylinder or something just so i have to replace it......