Okay so I've been having some serious brake issues with my girls e30. It's an 87 325e auto. About two months ago the brakes crapped out on her (went to the floor). So I replaced the mc and did a full bleed (well almost, one of the rear bleeders sheared off so I couldn't get one of the rear calipers) but the pedal seemed good and all the other lines were spitting clear fluid so I let it be.
1-2 weeks later, it craps out again. Now I should mention that the mc seemed to have a little fluid coming from somewhere, either the reservoir seals or the line fittings, I tightened up the line fittings more and that seemed to solve that problem. Thinking my issue was air in the lines from the unbleed rear I replaced the rear brakes with two reman ate units (beck arnley). Bleed it up good and it seemed to be road worthy again.
Fast forward another couple of weeks, after driving two hours west to my hometown she tells me that the pedal went to the floor again, so she leaves the car and I have it sent to my old mechanic for a vacuum bleed thinkin air was in the system still after my manual bleed. He keeps it for a week, bleed it twice and gave it a clean bill of health. She goes out to get it, drives it 100 miles home and it's good for another two weeks. Now this morning the pedal went to the floor again.
The replaced m/c was a NOS ate unit if that matters. Now im pretty stumped here, and I'm getting sick of throwing money at the problem, is it possible my master cylinder is slowing taking on air and that's what's causing the slow failure? It seems to come on without warning. The car is working fine and then one day she goes to start it and no brakes.
Any ideas brake gurus?
1-2 weeks later, it craps out again. Now I should mention that the mc seemed to have a little fluid coming from somewhere, either the reservoir seals or the line fittings, I tightened up the line fittings more and that seemed to solve that problem. Thinking my issue was air in the lines from the unbleed rear I replaced the rear brakes with two reman ate units (beck arnley). Bleed it up good and it seemed to be road worthy again.
Fast forward another couple of weeks, after driving two hours west to my hometown she tells me that the pedal went to the floor again, so she leaves the car and I have it sent to my old mechanic for a vacuum bleed thinkin air was in the system still after my manual bleed. He keeps it for a week, bleed it twice and gave it a clean bill of health. She goes out to get it, drives it 100 miles home and it's good for another two weeks. Now this morning the pedal went to the floor again.
The replaced m/c was a NOS ate unit if that matters. Now im pretty stumped here, and I'm getting sick of throwing money at the problem, is it possible my master cylinder is slowing taking on air and that's what's causing the slow failure? It seems to come on without warning. The car is working fine and then one day she goes to start it and no brakes.
Any ideas brake gurus?
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