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 Post subject: Brake swap
PostPosted: Mon Dec 05, 2011 12:39 am 
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Location: St.Louis, Mo
Year and Trim: 1988 & 89 Buick Lesabre T-types
So sorry if this has been addressed. I searched but didn't seem to find what I needed.

Question is: Is there a way to swap the GXP bonnie brakes to a 89 H-body? I ran in to a GXP with the two from calipers and most of the rest of the suspension and brakes

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 12:50 am 
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Unless there is another GXP at that yard, I wouldn't trust a single suspension or braking piece off that car. Like I said, metal does weird things when it gets hot, and I guarantee the seals are cooked in those calipers.

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 12:59 am 
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For the fronts, no for a few reasons.
The bolt battern for the caliper bracket and the knuckle are different.
The caliper bracket on the 89 bolts up from behind the knuckle, the F/00 from the front.
The F/00+ caliper bracket is threaded as is the 89 knuckle.

This pic is of a 95 knuckle and an 98-02 F-body caliper/bracket which is he same bolt pattern as the GXP.
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95 SLE... a keeper. 241k miles. Low and Slow.
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
74 Yamaha DT175: brap brap, brap
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 1:16 am 
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Joined: Sat May 24, 2008 10:13 pm
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Location: St.Louis, Mo
Year and Trim: 1988 & 89 Buick Lesabre T-types
SO if you did the w-body front swap with 00 spindles you would I assume..but question is are they any better than the f-bodys?

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 1:52 am 
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Fbody calipers are dual-piston? Correct?

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 2:01 am 
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Yes. The difference is that the GXP has room for a 13" rotor and the F-bodies have 12" rotors.

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 2:23 am 
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Id take dual piston over an extra 0.5" of usable rotor area.

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 2:44 am 
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Both are dual piston, Jake.

Poor pic, but:
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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 3:55 am 
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I'd like mine grab a little harder for sure. I'd really like to convert my rear drums to disc. :banana:

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 4:18 am 
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Just asking obvious questions....

What diameter are the FBody pistons?

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 7:36 am 
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Year and Trim: 1988 & 89 Buick Lesabre T-types
spoiledred94 I have been working with a guy on the lesabre t-type forum to develop a "conversion kit" to go to rear disc on my h-body. I would assume it would work for yours as well

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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 10:41 am 
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The GXP's 13" rotor adds leverage in addition to surface area.

LS1 F-body brake caliper pistons are 1.75" in OD.

The only reason I haven't done a rear disc conversion yet is because it would more than likely put my pedal travel into the new MC zone. I already have more pedal travel due to the F-bodies and going from wheel cylinders to pistons in the rear might be too far.

All you really need to do is sandwich a water jetted caliper mount (probably costs less than $50 if you have a CAD drawing) between the wheel bearing and the knuckle, space the caliper bracket accordingly, and replace the rear proportioning valves with adjustable.

I know of at least one lesabre guy, and one 6000 guy that have done the rear disk conversion but they didn't do anything for rear proportioning which is a waste IMO.

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95 SLE... a keeper. 241k miles. Low and Slow.
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
74 Yamaha DT175: brap brap, brap
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 3:02 pm 
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A conversion "kit"? That would be something I'd be very interested in. Would it still allow for the ABS?

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Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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 Post subject: Re: Brake swap
PostPosted: Mon Dec 05, 2011 11:55 pm 
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That I do not know for sure, I would assume so but not 100%. The person I am working with has found a car that has rear calipers that mount up with a simple mounting bracket, So you would need the rear discs, calipers, and the parking brake assembly form the junction point under the drivers side. Once I have more I will post on here and we can clarify if it indeed will work for other cars and years, but I assume if it works for his olds and my T it would work for the earlier boniness as well.

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 Post subject: Re: Brake swap
PostPosted: Tue Dec 06, 2011 12:15 am 
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95naSTA wrote:
All you really need to do is sandwich a water jetted caliper mount (probably costs less than $50 if you have a CAD drawing) between the wheel bearing and the knuckle, space the caliper bracket accordingly, and replace the rear proportioning valves with adjustable.

I know of at least one lesabre guy, and one 6000 guy that have done the rear disk conversion but they didn't do anything for rear proportioning which is a waste IMO.


This. Especially the proper portioning bit, otherwise you'll be worse off.

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 Post subject: Re: Brake swap
PostPosted: Tue Dec 06, 2011 11:30 am 
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Tricked-T wrote:
That I do not know for sure, I would assume so but not 100%. The person I am working with has found a car that has rear calipers that mount up with a simple mounting bracket, So you would need the rear discs, calipers, and the parking brake assembly form the junction point under the drivers side. Once I have more I will post on here and we can clarify if it indeed will work for other cars and years, but I assume if it works for his olds and my T it would work for the earlier boniness as well.


It's probably the 6000 STE rear mounting bracket.

Eary 90s F-bodies have a similar mounting bracket but the bolt hole spacing looks different.

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95 SLE... a keeper. 241k miles. Low and Slow.
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
74 Yamaha DT175: brap brap, brap
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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 Post subject: Re: Brake swap
PostPosted: Tue Dec 06, 2011 10:26 pm 
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Location: St.Louis, Mo
Year and Trim: 1988 & 89 Buick Lesabre T-types
The one thing we are trying to iron out is the proportioning aspect. I don't want a ton of pedal play.

The bracket would be custom made.

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89 T: http://www.cardomain.com/ride/2953294
88 T: http://www.cardomain.com/ride/3017546


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 Post subject: Re: Brake swap
PostPosted: Tue Dec 06, 2011 11:15 pm 
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Pedal play and fluid volume moved lies in the master cylinder.

Summit has adjustable proportioning valves. You need to replace the stock valves with these to raise and adjust the pressure going to the rear. Caliper pistons operate at a higher pressure than wheel cylinders.

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95 SLE... a keeper. 241k miles. Low and Slow.
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
74 Yamaha DT175: brap brap, brap
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


Top
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 Post subject: Re: Brake swap
PostPosted: Wed Dec 07, 2011 10:36 pm 
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I think he was thinking, due to the small size of the rear disc set up that it wouldn't need one, but might as well be safe apposed to sorry.

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88 T: http://www.cardomain.com/ride/3017546


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 Post subject: Re: Brake swap
PostPosted: Thu Dec 08, 2011 1:53 am 
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I understand you guys are still figuring this out -and thanks- but labor aside what would this basically cost including getting parts made and using used parts wherever you could?

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked

ImageImage
Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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