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72chevyLWB · 09-22-2002, 10:19 PM

My brake booster has always been bad. Brakes were never very good. Finally they got to the point where I had to stomp on the pedal to slow down just a little. So I went and bought a new booster. Brakes are sweet now, and my lockup converter is working in my 700R4. I have done everything I could think of to get the lockup to work and it never did. I finally gave up on it and all of a sudden it works because I got my vacuum back. I pulled 14.16 mpg today going 65 for 72 miles and 75 for 32 miles bucking a strong wind. I have to switch from manifold to port vacuum though I think.

tom hand · 09-22-2002, 10:22 PM

Quote:

I have to switch from manifold to port vacuum though I think.

On what?

72chevyLWB · 09-22-2002, 10:27 PM

vacuum switch for the lockup converter. It locks up immediately when it hits 4th gear and doesn't lockup in 3rd, so I think the vacuum might be screwing it up.

Crank · 09-23-2002, 07:49 PM

Did you add a stock unit or from a later model Chevy? Are you running discs? Sounds like you can actually run and stop now; Definately always good to stop.
Brandon

minibike · 09-23-2002, 08:14 PM

What did the new booster cost you?

Project1970 · 09-23-2002, 08:18 PM

If you have the 4th gear pressure switch wired in, you won't get it to lock up anywhere other than 4th gear.

RodC · 09-23-2002, 08:25 PM

Yep if the booster is leaking bad you will have a huge vacuum leak. Causes bad idol and can make some engines run so lean that you will burn valves, destroy pistons etc.

09-22-2002, 10:19 PM	#1
72chevyLWB Got 20's???? Join Date: Oct 2001 Location: Aberdeen SD Posts: 1,451	Funniest thing happened. My brake booster has always been bad. Brakes were never very good. Finally they got to the point where I had to stomp on the pedal to slow down just a little. So I went and bought a new booster. Brakes are sweet now, and my lockup converter is working in my 700R4. I have done everything I could think of to get the lockup to work and it never did. I finally gave up on it and all of a sudden it works because I got my vacuum back. I pulled 14.16 mpg today going 65 for 72 miles and 75 for 32 miles bucking a strong wind. I have to switch from manifold to port vacuum though I think. __________________ 99 Silverado Ex-Cab 2wd, Bagged&WhippleCharged 02 Sierra Ex-Cab 4wd 2500 HD The 72 went down the road.

09-22-2002, 10:27 PM	#3
72chevyLWB Got 20's???? Join Date: Oct 2001 Location: Aberdeen SD Posts: 1,451	vacuum switch for the lockup converter. It locks up immediately when it hits 4th gear and doesn't lockup in 3rd, so I think the vacuum might be screwing it up. __________________ 99 Silverado Ex-Cab 2wd, Bagged&WhippleCharged 02 Sierra Ex-Cab 4wd 2500 HD The 72 went down the road.

09-23-2002, 08:14 PM	#5
minibike Registered User Join Date: Jun 2002 Location: Lafayette, LA Posts: 500	What did the new booster cost you? __________________ 69 SWB LT1/4L60E www.classicplace.com

09-23-2002, 08:18 PM	#6
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	If you have the 4th gear pressure switch wired in, you won't get it to lock up anywhere other than 4th gear. __________________ Project1970 - LS1 Swap Complete!

09-23-2002, 08:25 PM	#7
RodC Registered User Join Date: Nov 2001 Location: Fairmont WV Posts: 304	Yep if the booster is leaking bad you will have a huge vacuum leak. Causes bad idol and can make some engines run so lean that you will burn valves, destroy pistons etc. __________________ Rod Childers '71 C10 Stepside

09-23-2002, 07:49 PM	#4
Crank Registered User Join Date: Aug 2002 Location: Crittenden, KY Posts: 1,964	Did you add a stock unit or from a later model Chevy? Are you running discs? Sounds like you can actually run and stop now; Definately always good to stop. Brandon



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