 Master cylinder service life |
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| 1970 Neun vierzehn |
 Feb 6 2007, 11:41 AM
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#1
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Advanced Member  Group: Members Posts: 3,199 Joined: 16-March 06 From: cincinnati, ohio Member No.: 5,727  |
As the refurbishing/renewing/restoration of my '70/4 continues, I began wondering about how long a brake master cylinder service life would be. I replaced the OEM 17mm w/a OEM 17mm in 1984 when the original started leaking. At that time, I also went completely through the pedal cluster, stripping and refinishing same and replacing the pedal bushings.
Now here it is 20+ years later, and the brakes have been fine and there is no m/c leaking problem. But 20 + years on the m/c? The brakes have been bled periodically and there are no pad/rotor/caliper issues here. To replace the m/c or not? I'm inclined to do so, though others have said "why bother". |
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Replies(1 - 5)
| Joe Ricard |
Feb 6 2007, 11:46 AM
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#2
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Just keep clean fluid in it and it could last a VERY long time.
Compete flush yearly minimum. I push fluid out monthly about 1/2 pint. |
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| So.Cal.914 |
Feb 6 2007, 11:48 AM
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#3
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
There are teeners running around with the stock 17mm M/C still working, mine
was when I replaced it and it was 30 yrs. old. But if your gut tells you to replace/ rebuild it then do it. |
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| Eric_Shea |
Feb 6 2007, 11:51 AM
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#4
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
QUOTE Just keep clean fluid in it and it could last a VERY long time. Compete flush yearly minimum. (IMG:style_emoticons/default/agree.gif) I've torn apart 37 year old brakes that look like new inside because... they got new fluid every year! I've torn apart some that have what I call "Caliper Worms" in there as well. This is when the fluid hardens and creates all sorts of problems. |
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| Rusty |
Feb 6 2007, 12:24 PM
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#5
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch 
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To ease the process, get yourself a set of Speedbleeders.
Well worth the money, and you can do the bleeding by yourself with no hassles. |
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| davep |
Feb 6 2007, 03:50 PM
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#6
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914 Historian Group: Benefactors Posts: 5,143 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
Back in the day, even with twice annual fluid replacement, we were lucky to get seven years service. I've replaced lots of MC's for customers.
Torsion bars and shocks were about the same. |
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