Brake hydraulic line schematic
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Elder User
Joined: Nov 2006
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From: Lynchburg, VA
Brake hydraulic line schematic
Guys, I'm looking for a schematic showing the hydraulic lines to the rear brakes. Especially showing the various pieces and the connections. A weblink or dwg would be much appreciated.
Thanks, Pat
Thanks, Pat
Post Fiend
Joined: Oct 2005
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From: Kiev, Ukraine
really, brake system is very simple. front lines run to front brake calipers, rear line runs to rear brake force valve and then to rear axe. If you have ABS all lines run throught modulator unit.
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Elder User
Joined: Nov 2006
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From: Lynchburg, VA
I have to replace the rubber hose to the right rear brake in order to satisfy state vehicle inspection. Not sure if I want to tackle this myself or take it to the shop. I know the fittings will be severly corroded and then there is the matter of bleeding the brakes which is really a 2 man job.
Posting Guru
Joined: Feb 2006
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Yeah, they can be a pain. The problem comes when the fitting corrodes to the brake line and when you attempt to turn it, it twists the line. If it breaks free, it will be ok. Always use a line wrench to keep from rounding off the corners of the fitting. If the corners are already gone, vice grips will usually do the trick. As for the hose, just order for that model truck.
If the line does twist off, and a new one isn't available, I cut off the line to a straight section, super clean it with a wire brush on a die grinder, and use a compression fitting to a new piece of line that can be purchased at your local auto parts.
jd
If the line does twist off, and a new one isn't available, I cut off the line to a straight section, super clean it with a wire brush on a die grinder, and use a compression fitting to a new piece of line that can be purchased at your local auto parts.
jd
Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
complete lines are not available. I twisted line when I changed rear wheel brake cyl. on my aerostar. I tried to look for line over EU and USA. and I got 6 mm steel line, purchaised fitting, then I bent line, pressed new fittings.... so look for 5.5mm, 6mm tubes and threadded fittings. Use made of steel tube, do not use cooper tubes available for clutch hydraulic lines and LPG fuel systems.
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Laughing Gas
Joined: Apr 2004
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From: Northern Maine
In some states (like Maine) compression fittings are not legal for use on brakes. We must use a double flare fitting to pass the state safety inspection. You have to buy a double flare tool and It takes a little practice to get it right. I always figured that it it doesn't leak, I did it right.
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Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
people say that soldering/welding of brake hoses not legal too. Well, I soldered brake line and had np problem. I have soldered clutch steel line on my aerostar too.
But there are fittings for brakes lines available: Mark Williams Enterprises - Brake Lines and Fittings
So you can make a line according to DOT requriments yourself using certified materials and tools. It is ruther easy, I did it. I used to run new steel lines for hydraulic and air-over-hydraulic systems (GAZ-66, Mercedes Vario) and I used to run new air brake lines rebuilding old cemitrailers (installing Wabco EBS-D and EBS-E systems) so be sure self made lines with certified components (tubes, fittings) are reliable like stock ones ore better (becouse new LOL).
But do all according manual by tubes and fittings manufacter and usung special tools. Bent linec caresully. Secure on frame with clamps, retainers like stock lines were installed to avoid vibration related damage.
But there are fittings for brakes lines available: Mark Williams Enterprises - Brake Lines and Fittings
So you can make a line according to DOT requriments yourself using certified materials and tools. It is ruther easy, I did it. I used to run new steel lines for hydraulic and air-over-hydraulic systems (GAZ-66, Mercedes Vario) and I used to run new air brake lines rebuilding old cemitrailers (installing Wabco EBS-D and EBS-E systems) so be sure self made lines with certified components (tubes, fittings) are reliable like stock ones ore better (becouse new LOL).
But do all according manual by tubes and fittings manufacter and usung special tools. Bent linec caresully. Secure on frame with clamps, retainers like stock lines were installed to avoid vibration related damage.
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Elder User
Joined: Nov 2006
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From: Lynchburg, VA
You guys are confirming my suspicions.....special tools, additional parts, many hidden surprises.....all to replace a $12 rubber tube. Then hydraulic fluid likely all over my driveway. I'm convinced I'd rather let the trained mechanic work this item albeit it is simple and straightforward.
Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
Brake Hose, Lines & Fittings
one more link available in the USA... I guess EU suppliers are not interesting now.... they use metric threads. I use metric threads on my aerostar becouse metric thread hoses are more popular here....
one more link available in the USA... I guess EU suppliers are not interesting now.... they use metric threads. I use metric threads on my aerostar becouse metric thread hoses are more popular here....
Thread Starter
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Elder User
Joined: Nov 2006
Posts: 696
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From: Lynchburg, VA
In some states (like Maine) compression fittings are not legal for use on brakes. We must use a double flare fitting to pass the state safety inspection. You have to buy a double flare tool and It takes a little practice to get it right. I always figured that it it doesn't leak, I did it right.
And when I had new tires installed I had their inspector look at the rear brake hose and he said it was fine. So I took it back to the original inspector and challenged their rejecting the hose and as it turned out, the reject was not specifically on the hose but on the line as it makes a bend to enter the hose. I saw it on the lift and sure enough it was pretty rotten and doomed. It is being fixed today and will find out what connection they use to couple a replacement section of line.
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