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Soft brakes after bleeding on 2011 Silverado 1500 #4631059
01/11/18 05:45 AM
01/11/18 05:45 AM
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
Just replaced both the front calipers and brakes on friends 2011 Silverado 1500.

We bleed both drivers and passenger side with the car off. We went through alot of fluid. Air is no longer exiting the caliper tubing when bleeding. The brakes are still spongy. What am I missing?

I'm frustrated and tired.

Thank you!


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631068
01/11/18 06:12 AM
01/11/18 06:12 AM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Must be the feel of the new pads until they seat/bed in.
How did you bleed the brakes?...

1)Gravity?
2)Vacuum Pump?
3)Two man system? I don't do a 2 man setup anymore as the person inside the truck can/could be pushing the master cylinder piston too far(not realizing) and cause cylinder wall scoring. You really shouldn't push the brake pedal to the floor!

What type of brake pads did you use?
Did you stray from OE or OE-like? Meaning did you change from the factory friction material(Semi-Mets vs Ceramic) and brake coefficient of friction/CoF(FF vs GG)?...I don't like CoF-GG pads but most others here do so, I'm the oddball in this camp.

Last edited by Char Baby; 01/11/18 06:20 AM.

"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631069
01/11/18 06:12 AM
01/11/18 06:12 AM
Joined: Dec 2013
Posts: 2,098
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,098
socal
Perhaps bleed the rear brakes, too


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: barkingspider] #4631074
01/11/18 06:24 AM
01/11/18 06:24 AM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Originally Posted By: barkingspider
Perhaps bleed the rear brakes, too


^^^Yes, this too however, I don't think(just me) that this is going to change the sponginess feeling since the brakes were feeling normal prior to the pad/rotor change.

Last edited by Char Baby; 01/11/18 06:28 AM.

"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631080
01/11/18 06:29 AM
01/11/18 06:29 AM
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
We bleed the brakes with two people. My buddy on the pedal, and I working the wrench.


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631081
01/11/18 06:31 AM
01/11/18 06:31 AM
Joined: Jan 2013
Posts: 396
West Yorkshire, UK
NGRhodes Offline
NGRhodes  Offline
Joined: Jan 2013
Posts: 396
West Yorkshire, UK
Originally Posted By: dja4260
Just replaced both the front calipers and brakes on friends 2011 Silverado 1500.

We bleed both drivers and passenger side with the car off. We went through alot of fluid. Air is no longer exiting the caliper tubing when bleeding. The brakes are still spongy. What am I missing?

I'm frustrated and tired.

Thank you!


Have you fired the engine up to get the servo working ?

Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: NGRhodes] #4631084
01/11/18 06:35 AM
01/11/18 06:35 AM
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
Yes, drove around after the process as well.


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: NGRhodes] #4631085
01/11/18 06:35 AM
01/11/18 06:35 AM
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
dja4260 Offline OP
dja4260  Offline OP
Joined: May 2011
Posts: 1,055
Greenville, SC via Chicago, IL
Originally Posted By: NGRhodes
Originally Posted By: dja4260
Just replaced both the front calipers and brakes on friends 2011 Silverado 1500.

We bleed both drivers and passenger side with the car off. We went through alot of fluid. Air is no longer exiting the caliper tubing when bleeding. The brakes are still spongy. What am I missing?

I'm frustrated and tired.

Thank you!


Have you fired the engine up to get the servo working ?


Yes


2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: Char Baby] #4631089
01/11/18 06:38 AM
01/11/18 06:38 AM
Joined: Jan 2018
Posts: 538
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 538
San Antonio, TX
Banjo washers. You will get air in the system if you don't use new washers.

Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: Char Baby] #4631091
01/11/18 06:45 AM
01/11/18 06:45 AM
Joined: Aug 2015
Posts: 2,917
NC
BigD1 Offline
BigD1  Offline
Joined: Aug 2015
Posts: 2,917
NC
Originally Posted By: Char Baby
3)Two man system? I don't do a 2 man setup anymore as the person inside the truck can/could be pushing the master cylinder piston too far(not realizing) and cause cylinder wall scoring. You really shouldn't push the brake pedal to the floor!


Had a few master cylinders go bad after bleeding brakes two man. The last one I had go bad had a big block of wood under the brake pedal during the two man bleed. Thought the block of wood would help but nope.


1992 Toyota Pickup--Harvest King Premium 10W-30--Fram PH3614
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: BigD1] #4631095
01/11/18 06:53 AM
01/11/18 06:53 AM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Originally Posted By: BigD1
Originally Posted By: Char Baby
3)Two man system? I don't do a 2 man setup anymore as the person inside the truck can/could be pushing the master cylinder piston too far(not realizing) and cause cylinder wall scoring. You really shouldn't push the brake pedal to the floor!


Had a few master cylinders go bad after bleeding brakes two man. The last one I had go bad had a big block of wood under the brake pedal during the two man bleed. Thought the block of wood would help but nope.


Yeah, I either gravity bleed or use the Mityvac.
I'll gravity bleed if I'm just inspecting/cleaning/lubing the brakes.
I'll Mityvac when doing a whole brake job. I'll turkey baste the master cylinder and start with fresh fluid.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631100
01/11/18 06:59 AM
01/11/18 06:59 AM
Joined: Jan 2011
Posts: 3,252
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,252
PV Az
This is a great tool if you have to bleed the whole system again. Super easy to do a complete flush. You need compressed air to use it but it's a 1 man job. https://www.harborfreight.com/brake-fluid-bleeder-92924.html


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: BigD1] #4631102
01/11/18 07:00 AM
01/11/18 07:00 AM
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
It sound like the MC went dry and now there is air in the ABS, use a scan tool to trigger the bleeding.
If you don't have one a shop wont charge much to do that for you.


ASE L1, Master. Deutsch Meisterbrief.
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631164
01/11/18 08:26 AM
01/11/18 08:26 AM
Joined: Jan 2017
Posts: 197
Michigan
64bawagon Offline
64bawagon  Offline
Joined: Jan 2017
Posts: 197
Michigan
First thing I would do is gravity bleed the rear brakes. Its simple enough to do and you dont even need to pull the wheels. Just break the bleeder free and place a hose on it to a container, let it drip for 10 minutes or so (watching the level in the MC reservoir) Do the drivers side first then the passengers. Cheap and easy. If that doesnt do it I would drive the truck and try to get the ABS to activate a few times then rebleed the system (you could get a Tech tool to activate the ABS for bleeding but I dont have one so this is the shadetree method)

Its also possible that one of the new calipers isnt any good or that the pads arent moving freely in the calipers. If the pads are binding and wont slide freely in the mounts it will give you a mushy peddle.

Last edited by 64bawagon; 01/11/18 08:29 AM.

05 Duramax Chevy(SOLD), 64 Chevy wagon, 10 Jeep Wrangler, 17 Equinox (rental), 18 Silverado 1/2 ton
Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260] #4631243
01/11/18 09:51 AM
01/11/18 09:51 AM
Joined: Feb 2011
Posts: 6,760
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,760
Hudson, NH
Why were the calipers replaced? I thought my front right caliper was frozen. Nope, it was the CRC grease recommended by the auto parts store. Do Not use standard brake grease on the calipers of that truck. The grease will get hot, boil, and harden jamming up the caliper bolts and slides. Use syl glide or a silicon based paste. Bad movement could cause spongy response.

You said replaced brakes, what does that include? (rotors, pads, etc). If it was just ceramic pads, old rotors, that may take a while for bedding to occur. The old rotor should come off and thoroughly cleaned to remove pad glazing and grease.

You're in Chicago. Go slip on something making the ABS flutter, try bleeding again. smile

You have a hydro boost system which means you rely on the PS pump for your power assisted brakes. Turn on truck and listen. Turn the wheel, step on the brakes. Hear any whining? May need to replace the PS pump. At least, turkey baste the PS reservoir a few times. this was my spongy brake issue. Not enough hydroboost pressure, faulty PS pump.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
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