Rear brake line ends?
10-07-2015, 01:09 PM
#1
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Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Rear brake line ends?
Hey guys,
i'm in mid resto in the UK and I've hit a snag. I have a'85 V6 SE and i can't seem to find out what the rear brake line end sizes are. I'm talking about the line which runs from the front end of the master cylinder to the 'T' pipe which is bolted to the rear axle. I need to know what size and thread each end is.
Really appreciate the help.
Thanks in advance
Rich
i'm in mid resto in the UK and I've hit a snag. I have a'85 V6 SE and i can't seem to find out what the rear brake line end sizes are. I'm talking about the line which runs from the front end of the master cylinder to the 'T' pipe which is bolted to the rear axle. I need to know what size and thread each end is.
Really appreciate the help.
Thanks in advance
Rich
10-08-2015, 10:46 AM
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Car: 1980 El Camino
Engine: Turbocharged 305
Transmission: TH350 (future 4L80E)
Axle/Gears: stock 2.56 posi
Re: Rear brake line ends?
The master cylinder outlet sizes are:
Front Port of Master Cylinder - M12x1.5 bubble flare (goes to rear brakes)
Rear Port of Master Cylinder - M11x1.5 bubble flare (goes to front brakes)
1985 to 1992 Proportioning Valve inlet sizes are:
Inlet Port from Front Port of Master Cylinder - M12x1 bubble flare (goes to rear brakes)
Inlet Port from Rear Port of Master Cylinder - M11x1.5 bubble flare (goes to front brakes)
1985 to 1992 Proportioning Valve Outlet sizes are:
Outlet Port to Rear Brakes - M14x1.5 bubble flare
Outlet Ports (2) to Front Brakes - M10x1 bubble flare
1982 to 1985 Proportioning Valve inlet sizes are:
Inlet Port from Front Port of Master Cylinder - 7/16-24 inverted flare ??
Inlet Port from Rear Port of Master Cylinder - 1/2-20 inverted flare ??
1982 to 1985 Proportioning Valve Outlet sizes are:
Outlet Port to Rear Brakes - 7/16-20 ?? or 9/16-18 ?? inverted flare
Outlet Ports (2) to Front Brakes - 3/8-24 inverted flares
Front Port of Master Cylinder - M12x1.5 bubble flare (goes to rear brakes)
Rear Port of Master Cylinder - M11x1.5 bubble flare (goes to front brakes)
1985 to 1992 Proportioning Valve inlet sizes are:
Inlet Port from Front Port of Master Cylinder - M12x1 bubble flare (goes to rear brakes)
Inlet Port from Rear Port of Master Cylinder - M11x1.5 bubble flare (goes to front brakes)
1985 to 1992 Proportioning Valve Outlet sizes are:
Outlet Port to Rear Brakes - M14x1.5 bubble flare
Outlet Ports (2) to Front Brakes - M10x1 bubble flare
1982 to 1985 Proportioning Valve inlet sizes are:
Inlet Port from Front Port of Master Cylinder - 7/16-24 inverted flare ??
Inlet Port from Rear Port of Master Cylinder - 1/2-20 inverted flare ??
1982 to 1985 Proportioning Valve Outlet sizes are:
Outlet Port to Rear Brakes - 7/16-20 ?? or 9/16-18 ?? inverted flare
Outlet Ports (2) to Front Brakes - 3/8-24 inverted flares
Last edited by manualbrakes.com; 10-25-2015 at 10:20 AM.
10-11-2015, 01:39 AM
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Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: Rear brake line ends?
Wow! Thank you for that comprehensive reply. That's sorted me right out and the parts are on the way!
Many thanks again
Many thanks again
10-13-2015, 12:21 PM
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Engine: 305 TBI/305 TPI
Transmission: World Class T5/missing
Axle/Gears: 3.08/G92 3.45 posi
Re: Rear brake line ends?
Man I wish I saw this post a few weeks ago. I was having trouble figuring out my brake issue and i needed to replace the lines and needed to determine the fittings for the aftermarket lines I was installing. I don't know how often people need/want to do aftermarket lines but this is very helpful for that.
10-13-2015, 01:06 PM
#5
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: Rear brake line ends?
Not to start a panic, but the fitting on the prop valve for the rear 6mm brake line is 14mm 1.5 the fitting at the rubber flex bose at the back of the car on the same line should be 12mm
10-13-2015, 01:47 PM
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Car: 1980 El Camino
Engine: Turbocharged 305
Transmission: TH350 (future 4L80E)
Axle/Gears: stock 2.56 posi
Re: Rear brake line ends?
Is the below correct?
1985 to 1992 Proportioning Valve Outlet sizes are:
Outlet Port to Rear Brakes - M14x1.5 bubble flare
Outlet Ports (2) to Front Brakes - M10x1 bubble flare ??
I question the M10x1 bubble flare outlets now. I pulled together a lot of this doing a search online.
10-13-2015, 05:26 PM
#7
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: Rear brake line ends?
I'm pretty sure the front outputs are a coarser threat that 10 1.0
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