Question about Chevrolet Silverado 1500

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Had a clogged brake line changed it bled system no peddel changed calopper still no peddel changed master cylinder got peddel then i start truck loose peddel changed master cylinder again and the same thing happened

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  • Chevrolet Master
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It sounds like there is still air in the system that needs to be bleed out.you might want to bleed all 4 wheels.make sure you bench bleed all the air out of the master cylinder before putting it on the car.you don`t say if this has abs brakes if it does sometimes you need a scanner with the capability to bleed the abs hydraulic unit as it may have air in it that you can`t get out without it.

Posted on May 25, 2011

You have to have the engine running to bleed brakes

Your need a helper to push the pedal while you crack
open the bleeders

Have to do all 4 corners

Just not bleed,have air in system

Never needed all those parts & you didn't have
a clogged brake tube.

Posted on May 25, 2011

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Posted on Jan 02, 2017

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1 Answer

Do you have to remove brake lines when you change the brake booster


Check rear of Master Cylinder--If wet likely Master Cylinder Leaking and Booster Damaged. They Should be replaced as a mated pair. (for warranty) and brake lines removed and system bled.

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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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4 Answers

Brake pedal goes nearly to floor front pads, calipers, brake hoses changed, rotors turned Master cylinder changed, brake booster check valve changed rear brakes checked, drums good no ridge, shoe's...


I would go with not bled correctly

The booster should hold up with a hard pedal until
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Did you remember to bleed the master cylinder itself? When the master cylinder runs dry you should start bleeding your brake system at the master cylinder and then continue on to each of the four wheel cylinders.

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Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.

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