for the guys with vacuum brakes

[FRANKIEz28]

I was checking my BLM's on the scanmaster and notice they rise when I apply the brakes. Does this happen to anyone else??

Thanks
FRANKIEz

 

[turbot2112]

not mine, ive been checking that lately. you could have a leak in your booster.

 

[Roger]

I bought a complete unit from the junkyard off an '86 Regal - $50.
I don't trust junkyard parts, so I bought a lifetime warranty master cylinder - $40.
The Casper vacuum block for the TTA wasn't available yet - I bought one of the two GM had at that time - $85.
I installed the assembly & the vacuum booster unit from the junkyard leaked vacuum - lifetime warranty one - $90.

A couple times on the street when pulling out into heavy traffic (read WOT- maximum boost & no vacuum to operate the vacuum brake boost unit), I would have some brain dead about 2-300' up the road also pull out. By the time I would realize the road is totally blocked (by the brain dead in the Toyota or the suv), I'd be over 40 mph & have to use both feet on the brake pedal to stop (also the traffic behind me is moving 40 - 50 mph.

I bought a vacuum booster pump for the early '80s Citation to give me vacuum to the brake booster all the time - $240. Had so much trouble finding the necessary 3/8” check valves, I never did finish the install.

After about a year the vacuum brake booster developed a vacuum leak. The leak was not steady & varied with every application & release of the brakes. Troubleshooting my IAC was a real hair puller, until I figured out the vacuum brake unit was leaking. No problem, lifetime warranty, I got & installed another unit.

The now third vacuum brake booster developed a leak in about a week. My last trip home from work with this vacuum booster unit was a nightmare. The computer was adding fuel to the leak & the TR was idling at approximately 2k rpm or 70+ mph. At the seemed like thousands of RED lights, using both feet to hold the brakes, the TR would not idle & would die unless I fed it more foot feed - however it took both feet to hold the brakes. I guess I was fortunate the seat didn't break loose from the floor.
I got my money back for the vacuum booster & have a Citation unused vacuum boost pump for sale & bought a lifetime warranty PM. My IAC is now adjusted properly & the PM always works (so far). The only problem with the PM install was that the old unit had blown the fuse.
You can do what you want & I have two local friends who have had no complaints about their vacuum conversions. I just couldn't see the difference in price - PM lifetime warranty - $199. Vacuum conversion - $505 & couldn't set IAC.
HTH,
Roger
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[FRANKIEz28]

I guess I have a leak in the booster
You know another thing, I always here a wosh sound coming from inside the dash whenever I apply the brakes. It sounds like theres air escaping somewhere.

Oh well sounds like I need a new booster

Thanks Guys
FRANKIEz