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Old 04-02-2007, 08:45 AM
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Default master cylinder

ok, been searching here and on Mud for hours, thought I would post before it drives me nutty. Put the original (I think) dual MC on the 40 today with a booster I grabbed from Shark Bait (THANKS!) Got everything hooked up and filled with fluid. Both pressure switches are leaking fluid, the rear one drained in 30 minutes. I am guessing they are not supposed to leak out the pressure switches. Worth trying to rebuild? I see on SOR I can replaced just the switches, but if the seals are bad there, I would guess they are all bad. After I pumped the brakes a few times there was also fluid sprayed in the engine bay, so I think they are leaking good. Or I am doing something very newbie wrong? Thanks.

T

PS-I have pics, will post tomorrow.
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Old 04-02-2007, 08:54 AM
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Pressure switch? The cups are empty? They are most likely leaking at the wheel cyl then.
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Old 04-02-2007, 09:07 AM
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Originally Posted by wesintl View Post
Pressure switch? The cups are empty? They are most likely leaking at the wheel cyl then.
Definitely leaking all over the engine bay at the "oil pressure switch" - what the 71 manual calls them. I guess they are hooked up to electrical leads and will light up the brake warning light if they detect loss of pressure? Regardless of what they do or what they are called, they probably should not be leaking....
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Old 04-02-2007, 09:17 AM
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oh... the brake warning lights.. IIRC those don't have a gasket on them. They are like pipe thread. Just tigheten them down if they are leaking at the thread. Or try some thread tape on them. If they are leaking from internally pull em and plug the holes.

My
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Old 04-02-2007, 09:19 AM
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Quote:
Originally Posted by wesintl View Post
oh... the brake warning lights.. IIRC those don't have a gasket on them. They are like pipe thread. Just tigheten them down if they are leaking at the thread. Or try some thread tape on them. If they are leaking from internally pull em and plug the holes.

My
leaking from the bottom, internally I think, not at the threads. Tried to tighten them and they are very stuck, not sure I could remove them if I tried!!

Thanks!

T
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Old 04-02-2007, 09:22 AM
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If you can get them off I probably have a set on an old master I have. Lord only knows why I keep bad masters and waterpumps. I sure as heck ain't going to rebuild it.
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Old 04-02-2007, 09:25 AM
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Tim,

You could use almost any LC or mini truck MC. So you might just get a new one or re-man one somewhere.

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Old 04-02-2007, 09:34 AM
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Quote:
Originally Posted by wesintl View Post
If you can get them off I probably have a set on an old master I have. Lord only knows why I keep bad masters and waterpumps. I sure as heck ain't going to rebuild it.
heh...I will PB them tonight and see if I can get them off. At this point I would probably just plug them if the rest of the MC is good. I can always replace it once it is on the road. I just want to see if I can get the brake system checked and ok before the engine goes in...

Thanks all!

T
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Old 04-02-2007, 01:20 PM
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you could always just plug them off and go without brake warning lites.
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Old 04-02-2007, 01:51 PM
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you could always just plug them off and go without brake warning lites.
probably what I will do if the MC is good. what would plug them good?

T
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