Vacuum loss: Brake Booster or Master Cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Austin C10 · 01-04-2006, 03:02 PM

I've discovered the source of my brake warning dash light: There is a vacuum leak that is evident (hissing) between the brake booster and the master cylinder. I'm not sure of the culprit yet, because I'm not sure about the best way to correct the problem.

I can say that I can stop the leak by pinching a hole that goes from one side of the connection between the booster and MC. I'm not sure about the purpose of this hole, but it is clearly intended to be there.

Where is vacuum usually lost? The brake booster or the MC? If its the booster, is it easier to replace the booster or rebuild. Also, could the leak be coming from that connection? How do I fix that?

01-04-2006, 03:02 PM	#1
Austin C10 1972 C10 Cheyenne LWB Join Date: Dec 2005 Location: Redwood City, CA Posts: 41	Vacuum loss: Brake Booster or Master Cylinder I've discovered the source of my brake warning dash light: There is a vacuum leak that is evident (hissing) between the brake booster and the master cylinder. I'm not sure of the culprit yet, because I'm not sure about the best way to correct the problem. I can say that I can stop the leak by pinching a hole that goes from one side of the connection between the booster and MC. I'm not sure about the purpose of this hole, but it is clearly intended to be there. Where is vacuum usually lost? The brake booster or the MC? If its the booster, is it easier to replace the booster or rebuild. Also, could the leak be coming from that connection? How do I fix that? __________________ 1972 LWB Cheyenne C10 350 TurboHydramatic

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