68 delmont brake noise HELP

sully · 03-29-2007, 05:08 PM

I just pat a new master cylinder on my 68 delmont and I'am getting a real high pich whistle from the booster if I hit the brake it goes away momentarly and if I unplug the vacum it goes away. HELP thanks Sully

Oldsguy · 03-30-2007, 05:10 AM

Was there a gasket on the cylinder base that you forgot? It sounds like a vacumm leak for sure, and is is probably a small hole or crack of some sort which is causing the whistle.

sully · 03-30-2007, 06:33 AM

yes I put the new gasket on.

Oldsguy · 03-30-2007, 11:11 AM

Maybe you could localize where at the MC the leak is somehow, not sure but there must be a way......hmmmm. If you know where it is, maybe then you could determine what is causing it and how to fix it.
does the power booster have an angled attachment on it made of plastic, maybe that is cracked or damaged.

sully · 03-30-2007, 11:26 AM

Its not the booster,the booster is only a few years old and with the old master I didnt have a problem. I'am going away for the weekend so I will end up thinking about it over the weekend and mess with it when I get back. it has to be the seal between the master and the booster? I'll let you know if I figure it out. thanks Sully

03-29-2007, 05:08 PM	#1 (permalink)
sully Junior Member Join Date: Feb 2007 Posts: 28	68 delmont brake noise HELP I just pat a new master cylinder on my 68 delmont and I'am getting a real high pich whistle from the booster if I hit the brake it goes away momentarly and if I unplug the vacum it goes away. HELP thanks Sully

03-30-2007, 05:10 AM	#2 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,553	Was there a gasket on the cylinder base that you forgot? It sounds like a vacumm leak for sure, and is is probably a small hole or crack of some sort which is causing the whistle. __________________ Dan '46 2 door

03-30-2007, 11:11 AM	#4 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,553	Maybe you could localize where at the MC the leak is somehow, not sure but there must be a way......hmmmm. If you know where it is, maybe then you could determine what is causing it and how to fix it. does the power booster have an angled attachment on it made of plastic, maybe that is cracked or damaged. __________________ Dan '46 2 door

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03-30-2007, 06:33 AM	#3 (permalink)
sully Junior Member Join Date: Feb 2007 Posts: 28	yes I put the new gasket on.

03-30-2007, 11:26 AM	#5 (permalink)
sully Junior Member Join Date: Feb 2007 Posts: 28	Its not the booster,the booster is only a few years old and with the old master I didnt have a problem. I'am going away for the weekend so I will end up thinking about it over the weekend and mess with it when I get back. it has to be the seal between the master and the booster? I'll let you know if I figure it out. thanks Sully