Does anybody know if I have 4 brake lines or 3 with the back brakes combining into 1

It should be 4 channel abs. So, 4 lines. It might be two that run from the master cylinder to the abs unit, then 4 from there to the brakes.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
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hi, from the abs controller there will be 1 line going to each wheel - if you get it off the ground, you can trace the lines to the respective wheel.

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

A couple of questions :
1. When I flare the brake line should I use
a double flare or bubble flare?

2. Depending on a double or bubble flare
what size fittings do I need to buy?

you will need a flare - and union to match flare
the bubble wont fit flare fitting and lines

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

There are two sizes of brake line used on these cars, 3/16" and 6mm (can use 1/4" to replace).

These are from the '97 that I did a few years ago.
Front Brake hardware
Brake line to brake hose: M10x1.0 (3/16 line) BLF-39C-5
Brake line to ABS: M12x1.0 (3/16" line) BLF-48C-5
Master cylinder to ABS: M12x1.0 (1/4" line, all 4 same) NAPA 641-3329

Rear Brake hardware
Brake line to ABS: M10x1.0 (3/16" line)
Brake line to Proportioning valve: M12x1.0 (inlet) M10x1.0 (outlet) (3/16" line)
Brake line to brake hose: M10x1.0 (3/16 line)

You need to bubble flare anything that's going into the factory connections, all brake line connections from the factory are metric and bubble flare.
If you have to add a splice, it doesn't matter if you bubble flare or double flare, as long as it matches the union you use. The fittings will work with either flare style.

_________________
Boost addict


The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
'04 Sierra 2500HD - LLY Duramax

Current project:
Something cool, trust me.

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

Gone to greener pastures:
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap

RIP:
'86 LeSabre - pictures
'93 SE - L67

[quote=

You need to bubble flare anything that's going into the factory connections, all brake line connections from the factory are metric and bubble flare.
[/quote]


i find this strange.both my ssei(96,2000) and 92 gtp had flare to fittings.

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

Yep. Basically everything FWD GM with a unibody uses all metric hardware. I'm sure there are limited exceptions to that rule, but everything on the '92-'99 H-body is definitely metric with bubble flares from the factory.

Now, I've seen people jamb a double flare in a bubble flare socket...But you risk stripping the hardware getting it tight enough to seal.

_________________
Boost addict


The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
'04 Sierra 2500HD - LLY Duramax

Current project:
Something cool, trust me.

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

Gone to greener pastures:
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap

RIP:
'86 LeSabre - pictures
'93 SE - L67