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A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

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Old 04-25-2000, 07:01 AM   #1
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Default life expectancy of the master cylinder?

I just had my master cylinder replaced at 55,000 miles. After searching the archieves, this has been a pretty big problem. Do you think they have addressed this issue and are using better quality ones?

What is the expected life of soemthing like this is most cars (domestic or import)?
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Old 04-25-2000, 07:09 AM   #2
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Default Re: life expectancy of the master cylinder?

I had two VW's both had almost 200,000 miles on them and the only items that needed attention were the pads and rotors. One could figure Audi parts should last at least as long as the VW stuff does!!

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Old 04-25-2000, 08:17 AM   #3
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Default Did you ever bleed the brakes?

Last I have heard, my old 1990 Coupe Quattro had 160K on it and still had OE master cyl. I assume A4 will last as long.

You don't say if you ever bled the brakes. If so, how did you do it? Standard method of one numnut pumping brakes then holding pedal down while other numnut opens bleed screw puts major strain on MC, since you force the piston seals past their normal travel points (look inside an old MC sometime; you will see a wear pattern due to normal piston movement).

I went thru 2 master cylinders on Porsche 911 in about 18 months back in early '80's due to bleeding this way. Switched to pressure bleeding, never had another problem (incl. 120K on '84 and 50K on '95 Porsche, plus above Coupe Quattro).
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Old 04-25-2000, 02:54 PM   #4
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Default I've never heard of bleeding the brakes, so, no I haven't

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Old 04-25-2000, 03:05 PM   #5
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Default Pressure bleeding and changing fluid regularly is the ticket for long life of brake parts

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Old 04-25-2000, 03:05 PM
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