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Let's talk brake boosters
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iansane
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Joined: 16 Jan 2004
Posts: 5740
Location: Bothell

1991 Pontiac Trans Am

PostPosted: Mon Feb 27, 2012 11:20 pm    Post subject: Reply with quote

QwkTrip wrote:
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.


Laughing I thought the same thing and had it installed on my car for 5 or so years. Never used it once. It was the most expensive brake line T fitting I ever bought.
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91RSVert
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Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

PostPosted: Tue Feb 28, 2012 5:07 am    Post subject: Reply with quote

So how do you fix the LS1 rod issue?

Since I went to disc brakes, I think I should have upgraded mine. I did fix the prop valve.
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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: Tue Feb 28, 2012 5:50 am    Post subject: Reply with quote

What LS1 rod issue? Laughing
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91RSVert
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Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

PostPosted: Tue Feb 28, 2012 6:54 am    Post subject: Reply with quote

QT posted about 5/8 the way down the front page, the LS1 has same threads, but the rod is different.
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Tue Feb 28, 2012 7:07 am    Post subject: Reply with quote

If you really want to do it right, get dual masters with a balance bar, and ditch the power assist.

But in real seriousness, I think the 4thgen master 3rdgen booster. I am pretty sure it was Al who did a really good write up on the switch.

When you go with the new master, ditch the prop-valve, and run full pressure to the fronts, and put an adjustable valve in the rear lines and then adjust to where you want your bias at.
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blue89
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Joined: 23 May 2006
Posts: 3482
Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Tue Feb 28, 2012 7:10 pm    Post subject: Reply with quote

I know Al and I have the 4th master and wilwood to the rear. Who else does? By far the best thing you can do for a brake upgrade and cheap! Well, cheap as long as you can flare your own brake line.
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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: Tue Feb 28, 2012 8:36 pm    Post subject: Reply with quote

blue89 wrote:
I know Al and I have the 4th master and wilwood to the rear. Who else does?


I have that exact setup. It stops the car when we push it in and out of the shop, so winning combination then? LMAO
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Al Hasse
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Joined: 19 Nov 2005
Posts: 4379
Location: Bremerton, WA

1992 Chevrolet Camaro RS

PostPosted: Tue Feb 28, 2012 9:30 pm    Post subject: Reply with quote

I tried two different 4th gen master cylinders. Other than the leaky one I got from e-Bay, the only issue I had was the thread depth of the port to the rear line - the fitting was too shallow and its shoulder bottomed on the master cylinder before it seated in the port. I forget offhand which of the two it was, but I'm inclined to believe it was the e=Bay special, which was early 4th gen. The one I have now I bought new at NAPA is for a 2002 Camaro SS.
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DBL_TKE
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Joined: 28 Feb 2007
Posts: 1505
Location: Aloha, OR

1991 Chevrolet Camaro Z/28

PostPosted: Tue Feb 28, 2012 9:42 pm    Post subject: Reply with quote

I been obsessing with tryin to get rid of the massive booster/master that our cars come with stock. How do people relocate them? And I think I've seen some BMW's with no visable booster in the engine bay.
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Richmond 3.73 posi| 36/24 sway bars | SLP LM2 | Koni's | Ground Control 800/200 | Y2K wheels | Dyno Don headers & Y-pipe | airfoil | BBK underdrive pulleys | Raised strut mounts | Extended ball joints | LCARB'S
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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Tue Feb 28, 2012 9:43 pm    Post subject: Reply with quote

Some ABS systems use an electric booster built into their system.
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iansane
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Joined: 16 Jan 2004
Posts: 5740
Location: Bothell

1991 Pontiac Trans Am

PostPosted: Tue Feb 28, 2012 11:08 pm    Post subject: Reply with quote

DBL_TKE wrote:
I been obsessing with tryin to get rid of the massive booster/master that our cars come with stock. How do people relocate them? And I think I've seen some BMW's with no visable booster in the engine bay.


A lot of bmws run hydroboost.

blue89 wrote:
I know Al and I have the 4th master and wilwood to the rear. Who else does?


Been running my bird that way for at least six years. Very Happy

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QwkTrip
11sec Club


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

1989 Pontiac Firebird

PostPosted: Thu Jun 02, 2016 4:48 pm    Post subject: Reply with quote

Let's do this again!

I don't like how my brakes are behaving. I want to trash the dual bore 3rd gen master and get a straight bore 1" master cylinder designed for front/rear disk brakes. What is the bore specs of a LS1 master cylinder?
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aaron_sK
Member


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

1987 Chevrolet Camaro IROC-Z

PostPosted: Thu Jun 02, 2016 5:56 pm    Post subject: Reply with quote

All fourthgens had a 1" bore.

V6 and V8 were the same as long as you had discs.

Thirdgen master is hot garbage. Throw in dumpster immediately!
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Alphius
Peanut


Joined: 05 Sep 2006
Posts: 2429
Location: Grand Mound

1984 Chevrolet Camaro Z/28

PostPosted: Thu Jun 02, 2016 7:58 pm    Post subject: Reply with quote

When I swapped on a 4thgen master, it greatly improved brake feel on my car. Of course, my original master was 30 years old so... Laughing
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QwkTrip
11sec Club


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

1989 Pontiac Firebird

PostPosted: Thu Jun 02, 2016 7:59 pm    Post subject: Reply with quote

What about the push rod with LS1 master cylinder? According to Baer the clearance should be set to 0.005 inch. If there is more clearance then the brake pedal will have excess travel before responding.
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aaron_sK
Member


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

1987 Chevrolet Camaro IROC-Z

PostPosted: Thu Jun 02, 2016 8:39 pm    Post subject: Reply with quote

Not an issue. I forget which rod I used, I think thirdgen. Either way it was nice and responsive with factory parts.
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Alphius
Peanut


Joined: 05 Sep 2006
Posts: 2429
Location: Grand Mound

1984 Chevrolet Camaro Z/28

PostPosted: Fri Jun 03, 2016 12:31 am    Post subject: Reply with quote

I used the thirdgen rod. Worked fine for me.
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