Extending brake lines - Impala Tech
Brakes & Suspension Conversion Questions & more

 
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post #1 of 13 (permalink) Old 08-01-2019, 10:52 PM Thread Starter
 
 
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Extending brake lines

Doing a disc brake conversion; wondering how to extend the brake lines because the proportioning valve is higher up than the original. How do i get the brake lines up there.
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post #2 of 13 (permalink) Old 08-02-2019, 05:37 AM
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Don't be afraid to bend them. I don't know if extensions are made, but if they are they are an additional leak point.
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post #3 of 13 (permalink) Old 08-02-2019, 10:23 AM
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Yes, go ahead and bend the lines carefully. However, if the gap is too big you have two solutions. Move the prop valve lower with longer lines FROM the master, or, use a union with a short section of pre-flared line to connect the original line to the prop valve. You can get unions (threaded couplers) and pre-flared lines from any parts store. Or, flare yourself for a custom fit. Note that I am NOT talking about COMPRESSION FITTINGS! Never use on a brake system.

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post #4 of 13 (permalink) Old 08-02-2019, 10:40 AM
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You can buy brake line from NAPA in 9", 12", 18", 24", and 36" inch lengths. It has to be double flared with a flaring tool after you put the fitting on the line.

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post #5 of 13 (permalink) Old 08-02-2019, 05:50 PM Thread Starter
 
 
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I’m confused on how the brake lines go in. The new proportioning valve is different from the original. Do I have to run all new brake lines?

The proportional valve on the driver side looks like it has one inlet for the driver side front brakes and another inlet for passenger side where there in another proportion valve for the passenger side front brake then it leads to the back brakes. Then the diver side has an outlet of the master cylinder.

On the new proportion valve it has two fronts and one rear inlet. And the rear inlet is a really big inlet that doesn’t fit any of the original brake hard lines.
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post #6 of 13 (permalink) Old 08-02-2019, 06:07 PM Thread Starter
 
 
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I looked up a YouTube and he was doing a 66 impala disc conversion. He ended up converting his 7/16 -20 used a union to convert it into a 9/16-18 to connect the rear into the prop valve. His line was 1/4 tho. Do I need to convert my rear brake lines to 1/4? Because my current rear brake lines are 3/16
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post #7 of 13 (permalink) Old 08-04-2019, 04:57 PM
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Your main brake line for the rear coming out of the proportioning valve is 1/4". then when it reaches the rear axle it tees off to each wheel with 3/16". you may have to put a different fitting (size and threads per inch) coming out of the new proportioning valve. You can buy flaring tool sets to double flare the tubing.
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post #8 of 13 (permalink) Old 08-04-2019, 10:30 PM Thread Starter
 
 
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Quote:
Originally Posted by wk2hons View Post
Your main brake line for the rear coming out of the proportioning valve is 1/4". then when it reaches the rear axle it tees off to each wheel with 3/16". you may have to put a different fitting (size and threads per inch) coming out of the new proportioning valve. You can buy flaring tool sets to double flare the tubing.
Hmm the main valve from front going to rear on my car is 3/16 then it tees off to two 3/16 in the rear. Should I switch this out to a 1/4 then tee off to two 3/16
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post #9 of 13 (permalink) Old 08-05-2019, 07:51 AM
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Yes, I would. I've had several cars of 60's and 70's and the main brake line going to the rear to the rear axle was 1/4" on all of them.
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post #10 of 13 (permalink) Old 08-05-2019, 04:28 PM
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There is no need to change the line size to the rear if you are sticking with the stock rear brakes. GM used the 3/16 line until the mid 60s. My 1965 C10 has the same size line.

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post #11 of 13 (permalink) Old 08-05-2019, 05:57 PM Thread Starter
 
 
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Quote:
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There is no need to change the line size to the rear if you are sticking with the stock rear brakes. GM used the 3/16 line until the mid 60s. My 1965 C10 has the same size line.
Goin with ABS disc brake system still noob on the whole brake system first time doing a restoration and full brake system. Looks like I’ll be running 1/4 line and splitting it to 3/16 learning a lot along the way. Thanks guys just put in master cylinder doing a whole
Overhaul on front and rear suspension and full brake system.
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post #12 of 13 (permalink) Old 08-06-2019, 07:38 AM
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Quote:
Originally Posted by Tony Dinh View Post
Goin with ABS disc brake system still noob on the whole brake system first time doing a restoration and full brake system. Looks like Iíll be running 1/4 line and splitting it to 3/16 learning a lot along the way. Thanks guys just put in master cylinder doing a whole
Overhaul on front and rear suspension and full brake system.
Really, which one? The expensive Bosch motor sports system that's hard to get even if you can afford it or something else that won't work?

1969 Imapala convertible build thread here:
https://www.pro-touring.com/threads/...ghlight=impala
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post #13 of 13 (permalink) Old 08-06-2019, 04:48 PM Thread Starter
 
 
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Quote:
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Quote:
Originally Posted by Tony Dinh View Post
Goin with ABS disc brake system still noob on the whole brake system first time doing a restoration and full brake system. Looks like I’ll be running 1/4 line and splitting it to 3/16 learning a lot along the way. Thanks guys just put in master cylinder doing a whole
Overhaul on front and rear suspension and full brake system.
Really, which one? The expensive Bosch motor sports system that's hard to get even if you can afford it or something else that won't work?
It’s the ABS power brake brand disc brake conversion.
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