Rear Brake Line Routing - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 28 (permalink) Old Sep 10th, 17, 03:25 PM Thread Starter
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Rear Brake Line Routing

Hi, I'm in the latter stages of a drum to disc brake conversion project (4w drum to 4w disc), and an running into issues with he brake lines. Namely, while the replacement lines (from inline tube) resembled those in the car for the front, the rear lines are altogether different.

For one, the front to rear line is in two pieces, rather than one like the line I took out, and at least from inspecting them, they do not follow the same path. Anybody have a diagram for how they should fit?

I'm also wondering how to route the flex tubes in the back, as there weren't flex tubes with the drum brakes.
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post #2 of 28 (permalink) Old Sep 11th, 17, 10:08 AM
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Re: Rear Brake Line Routing

The Factory Assembly Manual has a few good pages of how the stock lines were routed. You definitely want to pick that up if you don't already have it. Inline tube sells both the single piece front to rear and the two piece which is designed to be used with the hold off valve. Normally 4 wheel drums got the single piece front to rear. If you're running discs in the front it would be fine to run the valve.

The flex line between the body and the rear end housing always existed no matter what the stock brake configuration is. Is this the flex line you're talking about or something else? Hard lines ran the length of the rear end to the brake cylinders.

When I installed new lines from Inline tube not all of them fit great. I had to wrestle and hand bend a lot of them to route properly. Keep that in mind if you think they aren't fitting right. They'll go in, it just takes some patience.

Mike

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post #3 of 28 (permalink) Old Sep 11th, 17, 11:05 AM
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Re: Rear Brake Line Routing

Good advice on getting the Factory Assembly manual, I've practically wore mine out from use. I did find PDF versions online but nothing like having a paper version in hand.

Quote:
Originally Posted by ChevyCam View Post
Normally 4 wheel drums got the single piece front to rear.
My mostly original '69 had 4 wheel manual drum brakes and has the hold off valve on the drivers side frame rail, so I have the 2 piece brake line to the rear.

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post #4 of 28 (permalink) Old Sep 11th, 17, 03:48 PM Thread Starter
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Re: Rear Brake Line Routing

Thanks. Yep, I've got the assembly manual. Used it a ton. But this two piece is so much different. i mean, if I put them next to each other, they bend way differently.

The new disc brakes (which are in the rear too) have to be hooked up to flex hoses, I think, to connect with the "banjo" bolts.
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post #5 of 28 (permalink) Old Sep 11th, 17, 05:57 PM
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Re: Rear Brake Line Routing

Quote:
Originally Posted by Mike's69stroker View Post
But this two piece is so much different. i mean, if I put them next to each other, they bend way differently.

The new disc brakes (which are in the rear too) have to be hooked up to flex hoses, I think, to connect with the "banjo" bolts.
The two piece lines are only if you have the hold off valve located on the frame rail and it sounds like your car doesn't when you said one line front to rear. So you have the wrong brake lines, Inline sells both.

It may be that you need flex hoses out at the rear calipers to accommodate the particular rear disc brake kit you have installed, that's not the way they were originally so Inline might not have the right rear differential lines to mate up. You may have to bend up you own and make something custom.

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post #6 of 28 (permalink) Old Sep 11th, 17, 06:51 PM Thread Starter
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Re: Rear Brake Line Routing

So the two piece can only work if there's a "hold off" valve on that line? (I think the combination valve is all that I need with mine)
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post #7 of 28 (permalink) Old Sep 11th, 17, 08:08 PM Thread Starter
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Re: Rear Brake Line Routing

Any reason I can't use the two-piece set up without a hold valve?
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post #8 of 28 (permalink) Old Sep 11th, 17, 10:28 PM
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Re: Rear Brake Line Routing

Quote:
Originally Posted by Mike's69stroker View Post
Any reason I can't use the two-piece set up without a hold valve?
Nope. You just need a union assuming the resultant line is long enough.

Don
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post #9 of 28 (permalink) Old Sep 12th, 17, 05:12 AM
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Re: Rear Brake Line Routing

Quote:
Originally Posted by Mike's69stroker View Post
Any reason I can't use the two-piece set up without a hold valve?
I purchased the two piece to replace the one piece I had. I plan to put a line lock in that spot. The pictures I 've seen of the valve that goes there looks like a junction block we sold at the parts store years ago. I'm sure you can find some thing to connect those lines with.

Jeff
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post #10 of 28 (permalink) Old Sep 12th, 17, 06:34 AM
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Re: Rear Brake Line Routing

Yes like has been said you could just join the two brake lines.

Here is a pic of the hold off valve.

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post #11 of 28 (permalink) Old Sep 12th, 17, 06:37 AM Thread Starter
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Re: Rear Brake Line Routing

Cool. I think I can make something up for the two flex hoses in the back. I'd like to use the "clips" they came with, but I don't have mounting brackets and have no idea where they'd go anyway.

Also, I wonder if I can do without the flex line between the body and the rear end housing. A new one didn't come with the kit, so I assume I can (do without it).
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post #12 of 28 (permalink) Old Sep 12th, 17, 07:13 AM
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Re: Rear Brake Line Routing

Quote:
Originally Posted by Mike's69stroker View Post
Also, I wonder if I can do without the flex line between the body and the rear end housing. A new one didn't come with the kit, so I assume I can (do without it).
No you need that! Allows movement of the rearend separate from the body when the suspension moves. It's a common part, I bought a new one at the local auto parts store for $16
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post #13 of 28 (permalink) Old Sep 12th, 17, 09:36 AM Thread Starter
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Re: Rear Brake Line Routing

Got it. Will do
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post #14 of 28 (permalink) Old Sep 12th, 17, 09:38 AM Thread Starter
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Re: Rear Brake Line Routing

I lack imagination, so I'll search for pics on-line for how others have routed the flex hoses from the calipers
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post #15 of 28 (permalink) Old Sep 12th, 17, 11:06 AM
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Re: Rear Brake Line Routing

The clips go in holes in the body or subframe. There were no mounting brackets except for the one where the flex hose mounts near the axle if I remember right. you can get that bracket
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