Brake Booster choice

[nitrofarm]

My Aspire's idle drops @250 rpm when I press the brake pedal. 'm assuming its the booster.Is there any better (bigger) alternative to the ATX booster's.Or is that my only choice? Thanks in advance
Edit: I've looked for a vaccum leak,and didnt find anything obvious.

[nitrofarm]

02 Kia Rio Power Booster swap ?

Anyone tried this? I can get it new from Kia @ $65.00 with my account. Anyone......thx!

[crazyrog17]

I know it's not what you asked, but I put an Escort ('99) brake booster on my girlfriend's Festiva.

There was trouble with the brake light switch though because the push rod was .25" shorter. I shimmed it with plastic to open the switch when the pedal was at rest.

The new booster bolted up fine but doesn't perform too noticeably different than my stock setup.

[FestYboy]

My Aspire's idle drops @250 rpm when I press the brake pedal. 'm assuming its the booster.Is there any better (bigger) alternative to the ATX booster's.Or is that my only choice? Thanks in advance
Edit: I've looked for a vaccum leak,and didnt find anything obvious.

does this happen with a single application, or do you have to hit it a few times to get the RPMs to drop? typicaly what should happen as you pump the brakes is the idle should INCREASE, not drop.

[Festy46]

Make sure you have a check valve in the vacuum hose that goes from the intake to the brake booster. If you replaced the OEM hose with an ordinary hose, you lost your check valve. You can verify if you have a check valve by feeling the hose for a "hard lump" about 3/4" long, or by pulling the hose off the brake booster immediately after running the engine without touching the brake pedal. When you pull the hose off the brake chamber, you should hear a distinctive hiss of air from the vacuum that was being held in the brake chamber.

It's also possible you may have a short in your brake light wiring. If you don't have a really good battery, the short could be putting an extra load on the alternator causing the rpm change.

[nitrofarm]

does this happen with a single application, or do you have to hit it a few times to get the RPMs to drop? typicaly what should happen as you pump the brakes is the idle should INCREASE, not drop.

Yes with each single application.It idles low for as long as I hold the brake pedal down.Lift & it smooths out...

[nitrofarm]

Make sure you have a check valve in the vacuum hose that goes from the intake to the brake booster. If you replaced the OEM hose with an ordinary hose, you lost your check valve. You can verify if you have a check valve by feeling the hose for a "hard lump" about 3/4" long, or by pulling the hose off the brake booster immediately after running the engine without touching the brake pedal. When you pull the hose off the brake chamber, you should hear a distinctive hiss of air from the vacuum that was being held in the brake chamber.

It's also possible you may have a short in your brake light wiring. If you don't have a really good battery, the short could be putting an extra load on the alternator causing the rpm change.

Well I just went and let it run.Then shut it off.Let it sit for 10-15 seconds.Then pulled the hose of @ the booster.Heard a loud hiss.Checked the check valve by sucking/blowning. It is fine-Soooo maybe its the brake lights.I'll try pulling the fuse & switch seperatly to isolate it(if thats what it is indeed.) Thanks for idea

[FestYboy]

another possibility is the breather valve on the back side of the diaphram (another one-way valve built into the booster). BUT, seeing that the RPMs STAY down as long as you depress the pedal, i would agree with Festy46 and look for an electrical draw putting an excessive load on the alt, thus pulling the RPMs down.

[nitrofarm]

another possibility is the breather valve on the back side of the diaphram (another one-way valve built into the booster). BUT, seeing that the RPMs STAY down as long as you depress the pedal, i would agree with Festy46 and look for an electrical draw putting an excessive load on the alt, thus pulling the RPMs down.

Sounds like a plan.Been burning the candle @ both ends.Hopefully tonight I'll get a chance.Thanks for the help!

[nitrofarm]

Sounds like a plan.Been burning the candle @ both ends.Hopefully tonight I'll get a chance.Thanks for the help!

Hey Arty youv'e got mail

[crazyrog17]

Take a look at your stoplight circuit yet? Hope you've figured it out!

[Movin]

Convert to LED, at least in the rear, the alternator will never see the difference from no lights to brake lights on.