Is it the master cylinder?


Asked by Sep 21, 2015 at 07:50 AM about the 2008 Chevrolet Silverado 1500 LT1 Extended Cab 4WD

Question type: Maintenance & Repair

Replaced front rotors and brake pads.  Went to depress pedal and it went to the floor.  Did not come up after pumping.  Did not take any lines off, only compressed pistons to accomodate new pads.  Pumped brakes, held pedal down  and opened bleeder and continue to get air coming out after every pumping.  Pedal continues to go to the floor with no resistance felt.  .

8 Answers


It sounds as it is the booster, not the mater cylinder...


if there is air every time you pump it you have a hole some place. if you pump it up does the peddle get hard at any point? i think one of your brake lines is bad are they wet

1 of 1 people found this helpful.

Could not find any leak anywhere. Have all wheels removed and pulled boots from wheel cylinders and checked pistons. Am curious why you would think it is the booster? Pedal does not get hard at any point at all.


When did you first bleed the brakes? If you bled the brakes after doing the pad change I am thinking you pushed the brake pedal down too far causing damage to the inside of the master cylinder. I always put a piece of wood under the pedal when doing this to keep the pedal off of the floor. Sometimes pushing the pedal farther than it has gone before will damage the cups / seals inside the master cylinder.

Best Answer Mark helpful

Read the manual bleeding paragraph.



Changing the master cylinder did the trick. Thanks Bob!

1 of 1 people found this helpful.

Glad you got it fixed and we appreciate the follow up.

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 161,879 nationwide Silverado 1500 listings starting at $1,295.


Chevrolet Silverado 1500 Experts

  • #1
    John Carson
  • #2
  • #3
    Andrew Olsen
View All

Related Models For Sale

Used GMC Sierra 1500
1,229 Great Deals out of 63,094 listings starting at $1,200
Used Ford F-150
3,206 Great Deals out of 226,351 listings starting at $1,250
Used Chevrolet Silverado 2500HD
454 Great Deals out of 29,756 listings starting at $2,795
Used Dodge Ram 1500
381 Great Deals out of 11,012 listings starting at $1,699
Used Toyota Tundra
704 Great Deals out of 34,649 listings starting at $1,995
Used Toyota Tacoma
644 Great Deals out of 41,021 listings starting at $2,500
Used Chevrolet Tahoe
882 Great Deals out of 39,459 listings starting at $1,799
Used Chevrolet Colorado
364 Great Deals out of 38,840 listings starting at $2,290
Used Ford F-250 Super Duty
502 Great Deals out of 47,173 listings starting at $1,817
Used GMC Sierra 2500HD
121 Great Deals out of 13,903 listings starting at $1,500
Used Nissan Titan
302 Great Deals out of 19,697 listings starting at $3,298

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
22 Great Deals out of 83,159 listings starting at $19,390
2017 Chevrolet Silverado 1500 For Sale
232 Great Deals out of 16,956 listings starting at $18,850
2016 Chevrolet Silverado 1500 For Sale
305 Great Deals out of 7,199 listings starting at $14,000
2015 Chevrolet Silverado 1500 For Sale
485 Great Deals out of 12,019 listings starting at $10,995
2014 Chevrolet Silverado 1500 For Sale
527 Great Deals out of 11,788 listings starting at $8,410

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.