Question about GMC Sierra 1500

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I have a 2003 GMC Sierra without hydroboost. I just had the master cylinder and reservoir replaced however the original in the truck did not have a hose hose connecot coming off the back of it but the new one does. They checked with the VIN at the GMC dealer and this one with the hose connector is what they say the truck should have. Is there some sort of compatability that certain GMC's had this and others didn't. Currently the hose connector is capped off by a rubber connector.

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  • Donald Tucker Mar 25, 2011

    By hose do you mean a vacuum hose or a brake line? I didn't know there was still a vehicle around without vacuum assisted (power) brakes. If the truck stops OK and the engine is running fine I would just leave the line capped.

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  • GMC Master
  • 45,531 Answers

Could be a bleed of for later models or a manufacturer modification so that the same part can be used in different in different vehicle applications
vehicle manufacturers do not make may of the parts in use but use products made by specialist shops and you new unit could fit a range of applications some of which may require that hose connection

Posted on May 27, 2017

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SOURCE: Check engine light/code 440?

you should look on the right side of the engine(closest to the firewall) for any loose or disconnected vaccum lines on your intake,throttle body or you evap system. I do have a question? does the vehicle idle rough or does it hesitate on acceleration?

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SOURCE: 2000 gmc sierra heater

the quick connect can be removed it requires a special tool thatr i dont seem to have and one can be picked up from the nearest parts store for about 6.00 dollars i cut mine off with a drimmal tool

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SOURCE: 1989 GMC sierra c1500 largest tire size?

any tire dealer can provide this info.

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SOURCE: My Power window on my 2003 GMC Sierra 1500 Truck

if your main switch panel still works the passenger window and if door locks still work probaly bad window motor

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SOURCE: 2004 GMC Sierra 4dr truck. the fan does not work

The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

Posted on Jan 06, 2010

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1 Answer

Do you have instructions on removing and replacing master cylinder in 1993 GMC Sierra K3500 pickup?


REMOVING
Removing the master cylinder is really simple, only requiring a few steps. Keep in mind that brake fluid will eat the paint of the car. So use a plastic or vinyl type fender cover to protect the vehicle's paint. Brake fluid is water soluble so if you should get some on the paint, wash it off with plenty of water as quickly as possible.
  1. Using a siphon, an old turkey baster works great, empty the master cylinder reservoir and dispose of the old brake fluid in the proper manner.
  2. Disconnect the wire connector for the brake fluid level and/or brake pressure-warning switch, if your vehicle is so equipped.
  3. Disconnect the brake lines from the master cylinder with a line wrench. A line wrench is specially designed to remove and install hydraluic fittings without rounding them off.
  4. Remove the master cylinder mounting nuts, then the master cylinder.
  5. On non-power brake vehicles, disconnect the master cylinder linkage from the brake pedal underneath the dash.
  6. On models with separate fluid reservoirs, remove the reservoir.
REPLACING
Before installing the new master cylinder on the vehicle, it must first be bled using a specialized bleeder kit. The master-cylinder bleeder kit comes with tubing, clips and multiple adapters. Most new or rebuilt master cylinders come with a bleeder kit for that particular master cylinder.
  1. Begin by removing the cap.
  2. Follow the directions that come with the kit to select the suitable adapters, and then connect the adapters and tubes to the ports on the cylinder. The other ends of the tube extend down into the master cylinder, and are held in place by a plastic clip. Figure 2.
  3. With the bleeder kit installed, fill the master cylinder about halfway with new brake fluid. Use a large screwdriver to depress the valve assembly inside the master cylinder. If you do not have a vise you can mount the master cylinder on the vacuum brake booster and bleed the master cylinder.
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Oct 12, 2009 | 1993 GMC Sierra K3500

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