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2000 chevy silverado no brake pressure

I have a 2000 chevy silverado that the brake pedal has no pressure. Replaced front calipers master cylinder and have bled about 1 gallon of brake fluid through system. Have also bled with the automated brake bleed procedure on my snap on scan tool. Sometimes you can pump the pedal about 50 times and you will get pressure but as soon as you let off from it it fall back to the floor. Any help would be appriciated. Im leaning towards the brake pressure modulator valve.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Thunder55
  • 318 Answers

SOURCE: no fluid come out when bleeding brakes drivers side front

Brake rubber flex line could be collapsed,,or kinked,,,i suggest loosening of the line at the master cylinder distribution block (this will give you the ability of loosening off one line at a time,,and have some one push the brake pedal down,,if you see fluid at this point then you know it has to be the line or the caliper.
if you get no pressure from the distribution block then its the master cylinders fault

Posted on Jan 16, 2009

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  • 226 Answers

SOURCE: How do i properly bleed out my Jimmy?

I use a vacuum bleeder (abt $35) starting at the furthest brake line from the master cylinder & working my way back to the closest. If bled properly by keeping the maste cylinder full, this should solve your problem. Rick

Posted on Apr 15, 2009

Molson02536
  • 3854 Answers

SOURCE: having trouble bleeding brakes on my ford f150 4x4

1 Siphon off the old brake fluid in the master cylinder reservoir under the hood.
2 Fill the reservoir with new brake fluid (don't reuse old fluid as it holds moisture and will corrode your brake system).

3 Start with the brake farthest from the Master cylinder, usually rear wheel, passenger side. Pull off the rubber cover on the bleeder valve. Attach the aquarium air line to the nipple on the bleeder.

4 Have your assistant pump the brake pedal up and down 3-4 times, then hold the pedal down fairly hard.
5 Open the bleeder, let fluid flow out through the air line into a waste container. (preferrably a clear bottle so you can see any air bubbles escaping the system). When the fluid stops and your assistant's foot hits the firewall (brake pedal all the way down), close the bleeder valve immediately!
6 Go to step #4 above and drain more fluid out of the bleeder valve until clean fluid comes out. Check the master cylinder every time and top it up as necessary. This procedure uses lots of fluid.

7 Now move to the rear brake on the driver's side. Go to step #4 and repeat the same procedures above until clean fluid comes out of the bleeder valve and no bubbles.
8 Next is the front brake, passenger side, same procedure. Then the drivers side and the same procedure.
9 When finished check for any leaks, remount rubber covers on the bleeder valve nipples. Remount all wheels, re-torque lug nuts after 50-100 miles of driving.
10 Start vehicle and depress the brake pedal. It should feel much less spongy than before this procedure. If not, there is air in the system, start over. Bleed everything again.
Note: if you assistant releases the brake pedal before you can close the bleeder valve then air will be introduced into the brake lines. This is no good! Before you start tell your assistant you will tell him/her PUMP, HOLD DOWN, RELEASE commands.

That's it, you're done. Congratulate yourself on saving some cash instead of handing it over to a mechanic.

Posted on May 13, 2009

  • 53 Answers

SOURCE: 97 Chevy Silverado Brake Problem

start bleding again from left to rigt all the way around.

Posted on Oct 09, 2009

  • 16 Answers

SOURCE: 89 c1500, full pedal on brakes until started then

adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
Bruce Pike

Posted on Oct 10, 2009

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2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

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