Power drum brake help needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Piece of Work · 01-16-2010, 04:24 PM

When first started, I have good pedal and good braking. Drive it half a block and the pedal goes to floor with hardly any braking. They stay this way until the truck is turned off. When you switch off the engine, the pedal comes back up. It sounds as if there is a vacuum leak coming from the power booster. There is good vacuum at the hose, and when plugged, the RPM drop. When plugged in to the power booster, the RPM stay up. Is the booster shot? Is it a simple unbolt and replace? How do I identify the booster that is on the truck? Will any new booster work?

Thanks,

-Mark

mbgmike · 01-16-2010, 06:43 PM

Quote:

Originally Posted by Piece of Work

When first started, I have good pedal and good braking. Drive it half a block and the pedal goes to floor with hardly any braking. They stay this way until the truck is turned off. When you switch off the engine, the pedal comes back up. It sounds as if there is a vacuum leak coming from the power booster. There is good vacuum at the hose, and when plugged, the RPM drop. When plugged in to the power booster, the RPM stay up. Is the booster shot? Is it a simple unbolt and replace? How do I identify the booster that is on the truck? Will any new booster work?

Thanks,

-Mark

the left pisture is a delco morriane the second is a bendix. Easy to replace. just unbolts. Might as well change fluid to,
Hook up a vacuum pump and see if it pulls a vaccum. if not it leaks
booster will work from just about anything if the will bolt up to your truck and current fittings. You can put too large of a booster(people think they will stop better) on as well as too small of one.

Piece of Work · 01-16-2010, 08:55 PM

Thank you. That should make it easy.

Piece of Work · 01-23-2010, 01:20 PM

Follow up. Replaced the power booster and brakes work great!

mbgmike · 01-23-2010, 01:44 PM

Quote:

Originally Posted by Piece of Work

Follow up. Replaced the power booster and brakes work great!

We knew you would get it solved.
Mike

01-16-2010, 04:24 PM	#1
Piece of Work Cultural Infidel Join Date: Jan 2007 Location: Clearwater, FL Posts: 668	Power drum brake help needed When first started, I have good pedal and good braking. Drive it half a block and the pedal goes to floor with hardly any braking. They stay this way until the truck is turned off. When you switch off the engine, the pedal comes back up. It sounds as if there is a vacuum leak coming from the power booster. There is good vacuum at the hose, and when plugged, the RPM drop. When plugged in to the power booster, the RPM stay up. Is the booster shot? Is it a simple unbolt and replace? How do I identify the booster that is on the truck? Will any new booster work? Thanks, -Mark __________________ posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold! It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished.

01-16-2010, 08:55 PM	#3
Piece of Work Cultural Infidel Join Date: Jan 2007 Location: Clearwater, FL Posts: 668	Re: Power drum brake help needed Thank you. That should make it easy. __________________ posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold! It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished.

01-23-2010, 01:20 PM	#4
Piece of Work Cultural Infidel Join Date: Jan 2007 Location: Clearwater, FL Posts: 668	Re: Power drum brake help needed Follow up. Replaced the power booster and brakes work great! __________________ posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold! It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished.



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