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#1067781 - 08/26/20 07:52 PM Bake lines, master cyl, rear hose assy.  
Joined: Jan 2005
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8T7AERO Offline
15+ Year
8T7AERO  Offline
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Corona, CA
HI I have multiple questions, 1st question the rear brake lines that go to the rear wheel cylinders are they single or double flare ? I'm converting to disc and have to cut them. 2nd what is the bore size of the master cylinder 1" or 1-1/8 ? 3rd does anybody know where to purchase the rear hose assy from the cross member to the brake lines on the differential ? Mine is ok but since i have everything apart, might as well change it. Thanks


87 Aerocoupe, Rapp Racing 383 with AFR aluminum heads.Leather interior,Hedman headers,Flowmaster Super 40's, k&n filter,MSD Ing, 17x8 IROC w/ 245/45/17, Wilwood front & rear disc brakes, UMI Performance Stage 2.5 suspension,8.5 GN 4.11 posi rearend, Viking coilovers, Kenwood sound system..
#1067782 - 08/26/20 08:04 PM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
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Travis Jones Offline
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Travis Jones  Offline
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Ferndale, MI
I believe everything should be double flared, and the secondary MS bore is 36mm or 1.42 inches.


86 SS 6.2l LS3, Ilmor intake, Summit Stage 4 Cam, Stainless long tube headers, Stainless 3in exhaust, Tremec T-56 Magnum 6 speed, Eaton Truetrac 8.8 LSD, UMI Cornermax Front Suspension, 3-link Rear suspension w/ UMI Control Arms, UMI Front & Rear Braces, Brembo Brakes
#1067787 - 08/27/20 01:01 AM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
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86ttop Offline
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86ttop  Offline
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Posts: 11,898
Brooksville, Fl
You can get that rubber hose at any good parts store, I use and recommend NAPA, good luck!!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
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#1067803 - 08/28/20 06:22 PM Re: Bake lines, master cyl, rear hose assy. [Re: 86ttop]  
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Posts: 158
8T7AERO Offline
15+ Year
8T7AERO  Offline
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Joined: Jan 2005
Posts: 158
Corona, CA
Thanks again for the info everyone and @86ttop, pick it up yesterday from NAPA online with a 20% discount Thanks


87 Aerocoupe, Rapp Racing 383 with AFR aluminum heads.Leather interior,Hedman headers,Flowmaster Super 40's, k&n filter,MSD Ing, 17x8 IROC w/ 245/45/17, Wilwood front & rear disc brakes, UMI Performance Stage 2.5 suspension,8.5 GN 4.11 posi rearend, Viking coilovers, Kenwood sound system..
#1067810 - 08/29/20 01:04 AM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
Joined: Dec 1999
Posts: 11,898
86ttop Offline
20+ Year
86ttop  Offline
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Joined: Dec 1999
Posts: 11,898
Brooksville, Fl
thumbs


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1067829 - 09/01/20 05:52 PM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
Joined: Apr 2008
Posts: 75
malibudave78 Offline
10+ Year
malibudave78  Offline
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Joined: Apr 2008
Posts: 75
Houston, TX
Rear line is an inverted, double flare.

Stock master cylinder is a step bore. The primary bore is 24mm for both front and rear brakes. The seconary bore is 36mm, like stated above, and is only used on the front brakes, but it transitions down to the smaller 24mm primary bore for higher line pressures. I am not sure of the rear calipers you are using, but you can go to a 2000 right hand drive S10 master cylinder if you are using stock rear disc calipers. It is a 1.0" strait bore and is a bolt on and should work well with rear calipers. You might have to replace your front calipers if they have never been changed out as they are low drag and need a step bore master cylinder to work correctly. Any stock replacement caliper should be a normal, NON low drag caliper.

RAYBESTOS MC390572

Link to master cylinder swap: https://maliburacing.com/forum/threads/new-master-cylinder-option.124945/

You should be able to get the rear rubber line that is over the axle from the auto parts store.

#1067852 - 09/04/20 09:11 PM Re: Bake lines, master cyl, rear hose assy. [Re: malibudave78]  
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Posts: 158
8T7AERO Offline
15+ Year
8T7AERO  Offline
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Joined: Jan 2005
Posts: 158
Corona, CA
David thanks for the info: the front are the Wilwood DynoPro 6 piston calipers 120-13428/29 and the backs are the Wilwood 4-piston C6 calipers 120-13916. I'm upgrading the brakes and the suspension system and was wondering about upgrading the master cylinder as well. Keith


87 Aerocoupe, Rapp Racing 383 with AFR aluminum heads.Leather interior,Hedman headers,Flowmaster Super 40's, k&n filter,MSD Ing, 17x8 IROC w/ 245/45/17, Wilwood front & rear disc brakes, UMI Performance Stage 2.5 suspension,8.5 GN 4.11 posi rearend, Viking coilovers, Kenwood sound system..
#1067869 - 09/07/20 12:30 PM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
Joined: Apr 2008
Posts: 75
malibudave78 Offline
10+ Year
malibudave78  Offline
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Joined: Apr 2008
Posts: 75
Houston, TX
The Wilwood Front front calipers have a slightly smaller piston area than the twin piston S10 Blazer caliper.

The Wilwood rear calipers have a smaller piston area than a S10 blazer rear caliper.

That being said, the Right Hand Drive, 1.0" bore S10 master cylinder still would be a good fit if your vacuum brake booster is in good working order, but if your stock master cylinder is in good working order, I would try it first and see how you like it with the Wilwood brake setup. The smaller bore of the stock master cylinder MAY make your brakes a little more touchy with less brake feel, but you can't tell 100% unless you try it.

For any good brake setup, buy the stickiest tires you can afford to take advantage of your brakes.

#1067874 - 09/07/20 03:31 PM Re: Bake lines, master cyl, rear hose assy. [Re: 8T7AERO]  
Joined: May 2004
Posts: 983
BladeOfAnduril27 Offline
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BladeOfAnduril27  Offline
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Joined: May 2004
Posts: 983
Doylestown, PA
Thanks for the link about that master cylinder. I'm replacing my stock one and the blazer MC looks like a good choice since I'm already running Blazer front brakes and probably going to Blazer rear disc at some point. Unfortunately it looks like the ACDelco part is discontinued. I could not find it in stock anywhere. Raybestos MC390572 seems to be the same master, so I ordered that from RockAuto last night.


~ Matt H.

1988 Monte Carlo SS w/ T-tops, White with gray int, 350, Summit cam, World Torquer S/R heads, Holley St. Dominator intake, Edelbrock 600cfm carb, Champion 3-row alum radiator, ramchargers, 200-r4 with CK Shift Kit, billet servo, 2200 stall, Afterburner headers, Pypes 2.5" with x-pipe, Violator mufflers (stock exit), S10 front brake swap.

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