Engine/Transmission (1994 - 1998) Check valve on vacuum pump

[fishjack1]

My 1996 had the recall TSB 24-16-96 done way back when. . but now I see where there is another TSB 05-11-99 with a "new check valve"?



My question is should I install this "new and improved" check valve?



Last year I rebuilt my vacuum pump and installed new P/S pump because both were leaking and the check valve on the truck seems to be working fine...



Here is the info on TSB 05-11-99 -



"A revised power brake booster check valve P/N 05011393AA has been released for service. The new check valve replaces performance has been improved by changing the flapper style check valve to a spring loaded style check valve. The spring loaded style check valve performance is superior especially in vehicles that utilize mechanical vacuum pumps to provide the vacuum source to operate the brake booster. Part number 05011393AA should be used anytime the power brake booster check valve is serviced on the subject model vehicles.



The new part should be used when the vacuum check valve on diesel models are serviced. "

 

[kenny61]

If its gonna cost you money I wouldn't worry about it unless it wasn't holding. Mine sometimes leaks down over night but I am used to it and make sure I am pushing hard before I push in the clutch for start up. It pumps up in a few seconds

 

[fishjack1]

That is kinda what I was thinking. . it was the phrase - "The spring loaded style check valve performance is superior especially in vehicles that utilize mechanical vacuum pumps to provide the vacuum source to operate the brake booster. "



If by "performance" they mean it holds the vacuum after shutdown better that really is (as you mentioned) no big deal. .

 

[kenny61]

Thats all ( At least I think thats all) it does

 

[hsmith]

Two different valves here. Brake booster check valve is the one that pops into the booster. Mine had the original recall for the vacuum pump valve. I was not aware of the recall for the booster check valve.

 

[Bob4x4]

Two different valves here. Brake booster check valve is the one that pops into the booster. Mine had the original recall for the vacuum pump valve. I was not aware of the recall for the booster check valve.

TSB is not a recall... ... ... you are right they are different parts.

 

[hsmith]

Thanks Bob, still had sleep in my eyes when I posted "recall" for the TSB.