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Let's talk brake boosters
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Sun Feb 26, 2012 10:42 pm    Post subject: Let's talk brake boosters Reply with quote

I've got my brake booster out in order to install the Tick clutch master cylinder. As long as it is out I might as well put in whatever works best.

What is a good upgrade to 3rd gen brake booster? Is it even necessary to upgrade? I know we have some people that have taken very close look at brake options. I want to know what you know (but get it free of effort and in 10 minutes Laughing )
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 5:34 pm    Post subject: Reply with quote

Ah, come on! This is taking way more than 10 minutes!
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blue89
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Joined: 23 May 2006
Posts: 3482
Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Mon Feb 27, 2012 5:43 pm    Post subject: Reply with quote

I put a 4th gen master on mine. That is a relatively easy swap. Don't know why you would want more or less vacuum boost.
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86 RS - 7.4L V8 SOLD
89 RS - 3.25L V6 REMOVED
89 RS - 5.7L LT1 SOLD
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 5:46 pm    Post subject: Reply with quote

What about hyrdaboost? Any of those bolt up to a 3rd gen?
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Twilightoptics
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Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Feb 27, 2012 6:08 pm    Post subject: Reply with quote

STAY AWAY FROM HYDROBOOST!

PITA to work on, expensive, diag is an absolute nightmare.


There is no reason to get a different booster. The booster is designed based on the car's pedal assembly and master. You should know this. No reason to change.

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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Feb 27, 2012 6:22 pm    Post subject: Reply with quote

The cool kid option seems to be third gen booster with a fourth gen master. So that's what I did. Wink

Leave hydroboost on trucks where it belongs. The issue with using it on a performance car is that you are often in situations where your wheel is pulled over while you're hard on the brakes. The sudden dropoff in hydraulic pressure in that instance can cause things to go poorly.


Last edited by aaron_sK on Mon Feb 27, 2012 6:29 pm; edited 1 time in total
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 6:29 pm    Post subject: Reply with quote

I want to be a cool kid.
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 6:32 pm    Post subject: Reply with quote

Twilightoptics wrote:
You should know this.


Dude, I don't know **** about cars. You should know this. Laughing

But if you ever needs help with Excel spreadsheets and PowerPoint... well, you know where to find me. Thumbs up
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blue89
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Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Mon Feb 27, 2012 6:34 pm    Post subject: Reply with quote

Rolling Eyes

If you need pictures, im sure we can post a few.

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86 RS - 7.4L V8 SOLD
89 RS - 3.25L V6 REMOVED
89 RS - 5.7L LT1 SOLD
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 6:56 pm    Post subject: Reply with quote

Any other good master cylinder options to consider?

blue89 wrote:
If you need pictures, im sure we can post a few.


You dirty old man.
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QwkTrip
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Joined: 17 Feb 2004
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1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 7:05 pm    Post subject: Reply with quote

Aaron, do you use LT1 or LS1 master cylinder? Any difference?
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aaron_sK
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1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Feb 27, 2012 7:11 pm    Post subject: Reply with quote

I used the master from a pre-98 V6 car, if that's what you mean. Wink

I seem to remember that the LS1 cars had a stepped bore master. Ian would know more about that one than I.
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blue89
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Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Mon Feb 27, 2012 7:19 pm    Post subject: Reply with quote

3rd gen is tapered 3/4" bore and LT+ is a 1" straight. Or something like that. Loved mine. Way better pedal feel.
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89 RS - 5.7L LT1 SOLD
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 7:26 pm    Post subject: Reply with quote

My stock one is totally dry after draining for a decade, so it is perfect time to replace it with no mess, if there is any advantage.

Just browsing a few threads it seems the LT1 needs different threads for the lines and the LS1 has same threads as 3rd gen, but the rod is different.
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aaron_sK
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Feb 27, 2012 7:29 pm    Post subject: Reply with quote

Lines don't matter. You wont be reusing the stock ones since your stock prop valve should be headed for the scrap bin.

*Edit: Just took another look at the master in my car and it is the post-'98 style. Laughing Go figure buying used parts on fleaBay.
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QwkTrip
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Joined: 17 Feb 2004
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1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 7:36 pm    Post subject: Reply with quote

Now how am I supposed to be cool if you keep changing what it is to be cool?
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aaron_sK
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Joined: 23 Jan 2006
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Feb 27, 2012 7:41 pm    Post subject: Reply with quote

Upon further investigation I do not think it matters much. Here is a pic I found of the two torn down (LS1 on top, LT1 on the bottom):

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iansane
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Location: Bothell

1991 Pontiac Trans Am

PostPosted: Mon Feb 27, 2012 8:03 pm    Post subject: Reply with quote

Functionally both the LS and LT MCs are the same. However, the LS style has the low fluid indicator in the reservoir and I have no freaking clue where the low fluid indicator is on the LT cars? ABS assembly?

The ultra big brake cool kids go LS. Very Happy

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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Feb 27, 2012 10:15 pm    Post subject: Reply with quote

Alright, I might hunt down an LS1 F body master cylinder. I've got to redo lines anyway for roll control.

I don't know when and I don't know where, but I do have one immature act of stupidity in mind and it requires roll stop.
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blue89
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Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Mon Feb 27, 2012 10:20 pm    Post subject: Reply with quote

Fbody stoppies?

http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=bTwxHCHaoMo
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