changed to power booster

[Elmer Sampson]

I just my brakes to 1987 Monte Carlo booster. They work great, But now when come to stop the engine stalls. Never had a problem before conversion. I used 3/8" fuel hose & plastic tee. Any info will be appreciated. Thanks

 

[turbo nasty]

Assuming you mean vac brakes.....Sounds like your booster internals are leaking and causing a vac leak. Start car let idle.....shut off...pop hood...get out and pull the 90 degree check valve (part that line from manifold vac to booster connects to) off of booster. You will hear the stored vacum in the booster suck as it balances to the atmosphere. If not you booster and or check valve is bad

 

[Elmer Sampson]

Assuming you mean vac brakes.....Sounds like your booster internals are leaking and causing a vac leak. Start car let idle.....shut off...pop hood...get out and pull the 90 degree check valve (part that line from manifold vac to booster connects to) off of booster. You will hear the stored vacum in the booster suck as it balances to the atmosphere. If not you booster and or check valve is bad

Thanks, that was my thinking too. I'll try that next.

 

[Nick Micale]

I used 3/8" fuel hose & plastic tee. Any info will be appreciated. Thanks

Just my opinion, but after many years of vacuum brake conversions for customers, I do not use fuel line as it is not made for vacuum, but pressure.

I prefer to use OEM type 11/32" hydraulic hose like the factory does, and also with all the engine heat I have seen a couple plastic tees give up, brass is what I use.

 

[Elmer Sampson]

Pulled check valve from booster & had hissing sound. Can't blow into inlet of check valve but can suck out. assume the valve is working

 

[turbo nasty]

Where and how did you tie in vac line to engine?

 

[Elmer Sampson]

Where and how did you tie in vac line to engine?

Went into big vacuum line that goes to PCV valve

 

[BEATAV8]

Went into big vacuum line that goes to PCV valve

That's not a real good place to tee in.

 

[Elmer Sampson]

That's not a real good place to tee in.

please tell me how to get a better source

 

[BEATAV8]

please tell me how to get a better source

Check with FTS or Kirban. Some of the vendors sell an aluminum vacuum block with a dedicated port for vacuum brakes (like was used an 89 turbo trans am)

 

[Elmer Sampson]

Check with FTS or Kirban. Some of the vendors sell an aluminum vacuum block with a dedicated port for vacuum brakes (like was used an 89 turbo trans am)

Thanks Just ordered vacuum port

 

[Boxcars]

I would just add that T-ing in above the the PCV valve is an excellent location to get vacuum for brakes. There's no downside to it. Never had a problem in over 15 years on an assortment of turbo cars. On the other hand, I have used the TTA vacuum block and have had problems with them, plus I personally don't like the look of this big hose going from the throttle body to the booster.

 

[turbobob924]

Some guys have said you need to also replace the pedal which is a PITA
Did you use stick pedal?



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[Boxcars]

Some guys have said you need to also replace the pedal which is a PITA
Did you use stick pedal?



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You have to change the pedal when changing from powermaster to Vacuum. It's not hard.

 

[Nick Micale]

please tell me how to get a better source

With about 100 vac brake conversions we have done, no issues using the PCV line for the vac source.

 

[turbo89]

Check with FTS or Kirban. Some of the vendors sell an aluminum vacuum block with a dedicated port for vacuum brakes (like was used an 89 turbo trans am)

But thats the same vacuum source as the pcv.. how would that change anything?

 

[turbobob924]

Nick
Do you guys always also change the pedal?


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[Nick Micale]

The pin on the pedal for a vacuum booster is a different diameter, and is in a different location, for a Powermaster or the Hydroboost brake units,

 

[turbobob924]

Thx

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[BEATAV8]

But thats the same vacuum source as the pcv.. how would that change anything?

My bad, I thought they had it separated inside the block.