Question about Chevrolet Avalanche

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2003 checy avalanche...need brake line routing from master cylinder to comination valve to abs pump ports

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  • jdavis0518 Aug 10, 2011

    this has a combination valve not a proportioning valve....i ask for a diagram of the lines....the diagram you sent is not correct for this vehicle....w/o jl4 option on brakes....need to know which lines go into the abs ports...5 total ports...whicj port is left front etc.

  • jdavis0518 Aug 10, 2011

    need to know which lines go into abs ports...w/o jl4 option

  • jdavis0518 Aug 11, 2011

    that was the info i needed thanks



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THis is for a Chevy Silverado truck, since I could not find a diagram from GM. Here is a picture showing which line is which...

2003 checy avalanche...need brake line - zjlimited_1714.jpg

Looking from vehicle front to rear, there must be the layout, there are three connections along the top. From left to right, the connections are Front Left Wheel, Front Right Wheel, and the Connector near Left Rear Wheel that serves both rear wheels. The bottom two connections go to the Master Cylinder. The Left Connection goes to the rear Master Cylinder Connection and the Right Connection goes to the front Master Cylinder Connection.

Good Luck.

Posted on Aug 10, 2011

  • ZJ Limited
    ZJ Limited Aug 11, 2011

    Good luck... and thank you for using Fixya.


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The rear is pretty straight forward. It runs down under the drivers side. Each line goes through a small proportioning valve (one for the passenger side wheel near the firewall and one for the drivers side near where the rear crossmember is). Then as the two lines reach the rear crossmember one goes from its proportioning valve into a small line then into it's rubber hose to the caliper on the drivers side, while the other shoots strait across the rear crossmember and into its rubber hose to the passenger side caliper.------------- Click this link below for diagram:--- ---------- This should help.Thanks.Helpmech.

Posted on Aug 10, 2011


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99 caravan 3.3 no abs brakes. I have replaced a bad master cylinder and all 4 rusted brake lines. The ABS brake warning light is not on. The van does not pull to one side.

Something is wrong with your statement
it is a 99 caravan 3.3 no abs , then you are on about abs light pump etc
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master cylinders work through a. abs unit and not because of it so if the master cylinder becomes faulty, the abs pump will not operate until a wheel stops turning as there is no line pressure to stop a wheel turning
the abs light may not be on because there is nothing to operate the system to put it on

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The brake system bleeding procedure differs for ABS and non-ABS vehicles. The following procedure pertains only to non-ABS vehicles. For details on bleeding ABS equipped vehicles, refer to the ABS procedures later in this section.

WARNING Make sure the master cylinder contains clean DOT 3 brake fluid at all times during the procedure.
  1. The master cylinder must be bled first if it is suspected of containing air. Bleed the master cylinder as follows:
    1. Position a container under the master cylinder to catch the brake fluid.
    2. Loosen the left front brake line (front upper port) at the master cylinder and allow the fluid to flow from the front port.
    3. Connect the line and tighten to 24 ft. lbs. (32 Nm).
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WARNING Do not allow brake fluid to spill on or come in contact with the vehicle' finish, as it will remove the paint. In case of a spill, immediately flush the area with water.
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  2. Bleed the individual calipers or wheel cylinders as follows:
    1. Place a suitable wrench over the bleeder screw and attach a clear plastic hose over the screw end.
    2. Submerge the other end in a transparent container of brake fluid.
    3. Loosen the bleed screw, then have an assistant apply the brake pedal slowly and hold it down. Close the bleed screw, then release the brake pedal. Repeat the sequence until all air is expelled from the caliper or cylinder.
    4. When finished, tighten the bleed screw to 97 inch lbs. (11 Nm) for the front, or 66 inch lbs. (7.5 Nm) for the rear.
  3. Check the pedal for a hard feeling with the engine not running. If the pedal is soft, repeat the bleeding procedure until a firm pedal is obtained.

Fig. 1: Loosen the front brake line in order to bleed the master cylinder


Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid


Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system

Hope this helps to solve it; remember to rate this answer.

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Your description does sound like M/C issue, but the amout of fluid is not much, that comes out...

It is brakes, so forget it and just replace the M/C. Also, pick up enough fluid to bleed all brakes and GET A M/C BLEED KIT, which are little hoses that screw in where brake lines attach to M/C, and route into the brake fluid reservoirs...Bleed until no air, then carefully remove one at a time, and install the brake line.

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Btw, I’m available to help over the phone in case u need at

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