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#4631059 - 01/11/18 05:45 AM Soft brakes after bleeding on 2011 Silverado 1500
dja4260 Offline


Registered: 05/16/11
Posts: 1017
Loc: 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!
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2005 Toyota Highlander V6
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#4631068 - 01/11/18 06:12 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
Char Baby Offline


Registered: 05/25/05
Posts: 10017
Loc: 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.


Edited by Char Baby (01/11/18 06:20 AM)
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#4631069 - 01/11/18 06:12 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
barkingspider Offline


Registered: 12/22/13
Posts: 2040
Loc: socal
Perhaps bleed the rear brakes, too
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#4631074 - 01/11/18 06:24 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: barkingspider]
Char Baby Offline


Registered: 05/25/05
Posts: 10017
Loc: 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.


Edited by Char Baby (01/11/18 06:28 AM)
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#4631080 - 01/11/18 06:29 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
dja4260 Offline


Registered: 05/16/11
Posts: 1017
Loc: Greenville, SC via Chicago, IL
We bleed the brakes with two people. My buddy on the pedal, and I working the wrench.
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#4631081 - 01/11/18 06:31 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
NGRhodes Offline


Registered: 01/06/13
Posts: 326
Loc: 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 ?

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#4631084 - 01/11/18 06:35 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: NGRhodes]
dja4260 Offline


Registered: 05/16/11
Posts: 1017
Loc: Greenville, SC via Chicago, IL
Yes, drove around after the process as well.
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2005 Toyota Highlander V6
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#4631085 - 01/11/18 06:35 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: NGRhodes]
dja4260 Offline


Registered: 05/16/11
Posts: 1017
Loc: 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
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2013 Hyundai Elantra Gt Hatch 6 spd
2005 Toyota Highlander V6
1997 HD Sportster

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#4631089 - 01/11/18 06:38 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: Char Baby]
das_peikko Offline


Registered: 01/01/18
Posts: 499
Loc: San Antonio, TX
Banjo washers. You will get air in the system if you don't use new washers.

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#4631091 - 01/11/18 06:45 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: Char Baby]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: 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.
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#4631095 - 01/11/18 06:53 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: BigD1]
Char Baby Offline


Registered: 05/25/05
Posts: 10017
Loc: 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.
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'06 Mazda 3i 2.0L
'15 Nissan Altima 2.5 SV

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#4631100 - 01/11/18 06:59 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
AZjeff Offline


Registered: 01/14/11
Posts: 2630
Loc: 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
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#4631102 - 01/11/18 07:00 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: BigD1]
Trav Offline


Registered: 11/20/06
Posts: 18840
Loc: 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.
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#4631164 - 01/11/18 08:26 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
64bawagon Offline


Registered: 01/10/17
Posts: 167
Loc: 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.


Edited by 64bawagon (01/11/18 08:29 AM)
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#4631243 - 01/11/18 09:51 AM Re: Soft brakes after bleeding on 2011 Silverado 1500 [Re: dja4260]
LeakySeals Offline


Registered: 02/18/11
Posts: 6561
Loc: 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.
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