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Bleed brakes on 08 sierra but their not working? including master cylinder!

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Did u bled them by frt lft wheel 1st than rgt side than lft rear, than rgt rear?
or maybe u may have a cyclinder problem.
Good Luck

Posted on Jul 01, 2009

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I have a 08 Chevy impala. I have no brakes I have replace the brake pads the calipers and the master cylinder still no brakes


Did you bleed the system of air? You will need to bench bleed the master cylinder. Then you will have to bleed the brakes at the bleeder valve on the calipers. Start with the wheel the is farthest from the master cylinder and work around the vehicle until you get to the closest one. Unless you have self bleeding valves you will have to have two people an do a little reading.

Dec 16, 2015 | Cars & Trucks

1 Answer

Replaced everything on my 97 GMC Sierra I bleed my brakes only last 3 days and they get spongy again


by everything does that include the master cylinder. If you did and there is a switch in the middle of the master cylinder ( brake failure switch) then replace it as it leaks air in behind a brake rubber that finds it's way into a system on one side.

Jan 16, 2014 | Cars & Trucks

1 Answer

Bleed power steering/brake unit 2002 GMC Sierra 3500


The slash that you placed between the words steering/brake have me concerned. I certainly hope you did not think that these two systems are co-joined? The power steering system is a hydraulic system completely separate and isolated from the brake system. They also use two completely different types of fluid. Putting brake fluid in the power steering system would destroy it just as putting power steering fluid in the brake master cylinder will destroy it. The type(s) of rubber used in the seals for each of these systems demands they use their own fluid. Any cross-contamination will require a complete draining, cleaning, and replacement of ALL rubber components and seals. This would include the power steering pump and rack for the power steering system, and for the brake system the master cylinder, all calipers and wheel cylinder as well as the proportioning valve. If there is an ABS unit, it will need serviced as well.

Nov 15, 2013 | 2002 GMC Sierra

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Soft brake pedal on 1990 GMC Sierra. Replaced master cylinder, rear shoes are almost new, front pads are good.


if master replaced sounds like air still in lines rebleed the brake lines start with passenger rear than driver rear -pass front -than driver front last..before bleeding check rear brake shoes are adjusted correctly

Aug 10, 2011 | 1990 GMC Sierra

1 Answer

95 sierra k1500 low brake pedal and spongy have replaced master cylinder. calipers and rear wheel cylinders. bled brake several times. still the same


Sounds like you still have air in the system, you can get a brake bleeder with a one way check valve and put that in a bottle with a little brake fluid then when you pump the brakes it will allow fluid out without having to open and close the caliper fitting. just keep bleeding and I am sure you will get more air out. You might also try back bleeding where you pump brake fluid from the brake calipers to the master cylinder. Many shops do that now as it is more effective.

Dec 11, 2010 | 1995 GMC Sierra

1 Answer

Brake pedal went to floor. replaced master cylinder and blead system but no luck. what do i do?


Did you bench bleed the master cylinder before installing? Run lines from outputs on master cylinder back into reservoir and pump air out . Connect lines and bleed system, Start from back passenger wheel first then back drivers wheel then front passenger and last front drivers wheel.

Feb 27, 2010 | 2005 GMC Sierra 1500 Hybrid

1 Answer

Sofe brakes i have a 96 gmc sierra i bleed all wheels and replace the booster and the master cyer


Make sure you have bled all the air out of system.

Start bleeding from the furthest wheel first and work your way to the closes to master cylinder last,
You have everything else covered.

Feb 03, 2010 | 1996 GMC Sierra

1 Answer

Cant get brakes to bleed properly


Here's all the tricks for bleeding brakes that I've got:
1. keep the master cylinder FULL.. check it often. if you **** air into the lines, you're going to need to start all over... so keep it full.
2. Have a assistant pump the brake pedal and hold pressure- when you open the bleeder screws at the wheels, the pedal will drop. Make sure the assistant doesn't let off the pedal until you get that bleeder shut again. Then he can repressurize again (keep an eye on your fluid level).
3. Start at the farthest wheel. then work to the closest to the master cylinder.
4. Then refill the fluid as needed.
5. You may need to "center" the brake lite (dash indicator) you can do this by having the assistant hold pressure while you bleed the line at the master cylinder (quick and abrupt) you may have to do the front or the rear line (on the master cylinder).
Good luck...hope this aolves your issue..
k

Oct 14, 2009 | 2003 GMC Sierra 2500HD

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.
  4. Small bubbles will appear in the fluid. Continue working the valve assembly until no more bubbles appear. This indicates that the cylinder has been thoroughly bled.Reverse the removal procedure to install the master cylinder, noting the following Refer to your service manual for any Master Cylinder Push Rod Adjustment procedures if your vehicle requires it.Bleed brakes as described under Brake Bleeding.Operate the brakes several times and check for external hydraulic leaks.This is fairly straightforward job. Replacing a master cylinder should take you about 1 to 2 hours, depending on the make and model of car. If you are rebuilding the master cylinder, add about another hour or so.

Oct 12, 2009 | 1993 GMC Sierra K3500

1 Answer

1999 GMC Sierra brake problem


When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.

Gravity bleeding is when you just open the valve and let gravity pull the fluid down.

Keep in mind you must "prime" the master cylinder first before installing it, did you do that?

Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.

After this procedure you gravity bleed the brakes, then go on to the pedal technique.

Sep 04, 2008 | 1999 GMC Sierra

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